[pypy-commit] extradoc extradoc: merge heads
arigo
noreply at buildbot.pypy.org
Wed Jul 4 12:13:48 CEST 2012
Author: Armin Rigo <arigo at tunes.org>
Branch: extradoc
Changeset: r4273:b4c8103c877d
Date: 2012-07-04 12:13 +0200
http://bitbucket.org/pypy/extradoc/changeset/b4c8103c877d/
Log: merge heads
diff --git a/.hgignore b/.hgignore
--- a/.hgignore
+++ b/.hgignore
@@ -1,3 +1,11 @@
syntax: glob
*.py[co]
*~
+talk/ep2012/stackless/slp-talk.aux
+talk/ep2012/stackless/slp-talk.latex
+talk/ep2012/stackless/slp-talk.log
+talk/ep2012/stackless/slp-talk.nav
+talk/ep2012/stackless/slp-talk.out
+talk/ep2012/stackless/slp-talk.snm
+talk/ep2012/stackless/slp-talk.toc
+talk/ep2012/stackless/slp-talk.vrb
\ No newline at end of file
diff --git a/talk/ep2012/jit/talk/Makefile b/talk/ep2012/jit/talk/Makefile
--- a/talk/ep2012/jit/talk/Makefile
+++ b/talk/ep2012/jit/talk/Makefile
@@ -3,7 +3,7 @@
# http://bitbucket.org/antocuni/env/src/619f486c4fad/bin/inkscapeslide.py
-talk.pdf: talk.rst author.latex title.latex stylesheet.latex diagrams/tracing-phases-p0.pdf
+talk.pdf: talk.rst author.latex title.latex stylesheet.latex diagrams/tracing-phases-p0.pdf diagrams/trace-p0.pdf diagrams/tracetree-p0.pdf
rst2beamer.py --stylesheet=stylesheet.latex --documentoptions=14pt talk.rst talk.latex || exit
sed 's/\\date{}/\\input{author.latex}/' -i talk.latex || exit
#sed 's/\\maketitle/\\input{title.latex}/' -i talk.latex || exit
@@ -18,3 +18,9 @@
diagrams/tracing-phases-p0.pdf: diagrams/tracing-phases.svg
cd diagrams && inkscapeslide.py tracing-phases.svg
+
+diagrams/trace-p0.pdf: diagrams/trace.svg
+ cd diagrams && inkscapeslide.py trace.svg
+
+diagrams/tracetree-p0.pdf: diagrams/tracetree.svg
+ cd diagrams && inkscapeslide.py tracetree.svg
diff --git a/talk/ep2012/jit/talk/diagrams/trace.svg b/talk/ep2012/jit/talk/diagrams/trace.svg
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/jit/talk/diagrams/trace.svg
@@ -0,0 +1,969 @@
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diff --git a/talk/ep2012/jit/talk/talk.rst b/talk/ep2012/jit/talk/talk.rst
--- a/talk/ep2012/jit/talk/talk.rst
+++ b/talk/ep2012/jit/talk/talk.rst
@@ -215,3 +215,44 @@
|end_example|
|end_columns|
|end_scriptsize|
+
+
+Tracing example (3)
+-------------------
+
+.. animage:: diagrams/trace-p*.pdf
+ :align: center
+ :scale: 80%
+
+
+Trace trees (1)
+---------------
+
+|scriptsize|
+|example<| |small| tracetree.java |end_small| |>|
+
+.. sourcecode:: java
+
+ public static void trace_trees() {
+ int a = 0;
+ int i = 0;
+ int N = 100;
+
+ while(i < N) {
+ if (i%2 == 0)
+ a++;
+ else
+ a*=2;
+ i++;
+ }
+ }
+
+|end_example|
+|end_scriptsize|
+
+Trace trees (2)
+---------------
+
+.. animage:: diagrams/tracetree-p*.pdf
+ :align: center
+ :scale: 34%
diff --git a/talk/ep2012/lightning.html b/talk/ep2012/lightning.html
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/lightning.html
@@ -0,0 +1,46 @@
+<html>
+<head>
+ <meta name="viewport" content="width=1024, user-scalable=no">
+ <link rel="stylesheet" href="/home/fijal/src/deckjs/core/deck.core.css">
+ <link rel="stylesheet" href="/home/fijal/src/deckjs/themes/style/web-2.0.css">
+ <link rel="stylesheet" href="/home/fijal/src/deckjs/themes/transition/horizontal-slide.css">
+ <script src="/home/fijal/src/deckjs/modernizr.custom.js"></script>
+ <script src="/home/fijal/src/deckjs/jquery-1.7.min.js"></script>
+ <script src="/home/fijal/src/deckjs/core/deck.core.js"></script>
+ <script>
+ $(function() {
+ $.deck('.slide');
+ });
+ </script>
+
+</head>
+<body class="deck-container">
+ <section class="slide" id="title-slide">
+ <h1>What are you doing in October?</h1>
+ </section>
+ <section class="slide">
+ <h2>Chances are...</h2>
+ <img src="http://3.bp.blogspot.com/_xKuNUa9Qybk/TOSX0V1AozI/AAAAAAAAAA0/hPrArrooAsk/s1600/London+Rain.jpg"/>
+ </section>
+ <section class="slide">
+ <h2>But you can be here instead....</h2>
+ <img width="800px" src="http://travelwallpaperstock.com/wp-content/uploads/2012/05/Camps-Bay-beach.jpg"/>
+ </section>
+ <section class="slide">
+ <h1>On a work trip!</h1>
+ </section>
+ <section class="slide">
+ <h2>Introducing Pycon South Africa</h2>
+ <ul>
+ <li>Cape Town</li>
+ <li>First ever in Africa</li>
+ </ul>
+ <img width="800px" src="http://1.bp.blogspot.com/-k5q6rD3Cy_0/Tr51fcamu5I/AAAAAAAAAkk/bhrC-NcBu7U/s1600/%2528South+Africa%2529+-+Table+Mountain+-+The+Landmark+of+Cape+Town+2.jpg"/>
+ </section>
+ <section class="slide">
+ <div style="padding-top:100px">
+ <img width="800px" src="http://utazom.com/sites/default/files/u167/boulders_beach_04.jpg"/>
+ </div>
+ </section>
+</body>
+</html>
diff --git a/talk/ep2012/stackless/Makefile b/talk/ep2012/stackless/Makefile
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/stackless/Makefile
@@ -0,0 +1,15 @@
+# you can find rst2beamer.py here:
+# http://codespeak.net/svn/user/antocuni/bin/rst2beamer.py
+
+slp-talk.pdf: slp-talk.rst author.latex title.latex stylesheet.latex
+ rst2beamer.py --stylesheet=stylesheet.latex --documentoptions=14pt slp-talk.rst slp-talk.latex || exit
+ sed 's/\\date{}/\\input{author.latex}/' -i slp-talk.latex || exit
+ sed 's/\\maketitle/\\input{title.latex}/' -i slp-talk.latex || exit
+ sed 's/\\usepackage\[latin1\]{inputenc}/\\usepackage[utf8]{inputenc}/' -i slp-talk.latex || exit
+ pdflatex slp-talk.latex || exit
+
+view: slp-talk.pdf
+ evince talk.pdf &
+
+xpdf: slp-talk.pdf
+ xpdf slp-talk.pdf &
diff --git a/talk/ep2012/stackless/author.latex b/talk/ep2012/stackless/author.latex
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/stackless/author.latex
@@ -0,0 +1,8 @@
+\definecolor{rrblitbackground}{rgb}{0.0, 0.0, 0.0}
+
+\title[The Story of Stackless Python]{The Story of Stackless Python}
+\author[tismer, nagare]
+{Christian Tismer, Hervé Coatanhay}
+
+\institute{EuroPython 2012}
+\date{July 4 2012}
diff --git a/talk/ep2012/stackless/beamerdefs.txt b/talk/ep2012/stackless/beamerdefs.txt
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/stackless/beamerdefs.txt
@@ -0,0 +1,108 @@
+.. colors
+.. ===========================
+
+.. role:: green
+.. role:: red
+
+
+.. general useful commands
+.. ===========================
+
+.. |pause| raw:: latex
+
+ \pause
+
+.. |small| raw:: latex
+
+ {\small
+
+.. |end_small| raw:: latex
+
+ }
+
+.. |scriptsize| raw:: latex
+
+ {\scriptsize
+
+.. |end_scriptsize| raw:: latex
+
+ }
+
+.. |strike<| raw:: latex
+
+ \sout{
+
+.. closed bracket
+.. ===========================
+
+.. |>| raw:: latex
+
+ }
+
+
+.. example block
+.. ===========================
+
+.. |example<| raw:: latex
+
+ \begin{exampleblock}{
+
+
+.. |end_example| raw:: latex
+
+ \end{exampleblock}
+
+
+
+.. alert block
+.. ===========================
+
+.. |alert<| raw:: latex
+
+ \begin{alertblock}{
+
+
+.. |end_alert| raw:: latex
+
+ \end{alertblock}
+
+
+
+.. columns
+.. ===========================
+
+.. |column1| raw:: latex
+
+ \begin{columns}
+ \begin{column}{0.45\textwidth}
+
+.. |column2| raw:: latex
+
+ \end{column}
+ \begin{column}{0.45\textwidth}
+
+
+.. |end_columns| raw:: latex
+
+ \end{column}
+ \end{columns}
+
+
+
+.. |snake| image:: ../../img/py-web-new.png
+ :scale: 15%
+
+
+
+.. nested blocks
+.. ===========================
+
+.. |nested| raw:: latex
+
+ \begin{columns}
+ \begin{column}{0.85\textwidth}
+
+.. |end_nested| raw:: latex
+
+ \end{column}
+ \end{columns}
diff --git a/talk/ep2012/stackless/demo/pickledtasklet.py b/talk/ep2012/stackless/demo/pickledtasklet.py
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/stackless/demo/pickledtasklet.py
@@ -0,0 +1,25 @@
+import pickle, sys
+import stackless
+
+ch = stackless.channel()
+
+def recurs(depth, level=1):
+ print 'enter level %s%d' % (level*' ', level)
+ if level >= depth:
+ ch.send('hi')
+ if level < depth:
+ recurs(depth, level+1)
+ print 'leave level %s%d' % (level*' ', level)
+
+def demo(depth):
+ t = stackless.tasklet(recurs)(depth)
+ print ch.receive()
+ pickle.dump(t, file('tasklet.pickle', 'wb'))
+
+if __name__ == '__main__':
+ if len(sys.argv) > 1:
+ t = pickle.load(file(sys.argv[1], 'rb'))
+ t.insert()
+ else:
+ t = stackless.tasklet(demo)(9)
+ stackless.run()
diff --git a/talk/ep2012/stackless/eurpython-2012.pptx b/talk/ep2012/stackless/eurpython-2012.pptx
new file mode 100644
index 0000000000000000000000000000000000000000..9b34bb66e92cbe27ce5dc5c3928fe9413abf2cef
GIT binary patch
[cut]
diff --git a/talk/ep2012/stackless/logo_small.png b/talk/ep2012/stackless/logo_small.png
new file mode 100644
index 0000000000000000000000000000000000000000..acfe083b78f557c394633ca542688a2bfca6a5e8
GIT binary patch
[cut]
diff --git a/talk/ep2012/stackless/slp-talk.pdf b/talk/ep2012/stackless/slp-talk.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..3b3f2466f0dd3b60fb7167eed49d66569d107da6
GIT binary patch
[cut]
diff --git a/talk/ep2012/stackless/slp-talk.rst b/talk/ep2012/stackless/slp-talk.rst
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/stackless/slp-talk.rst
@@ -0,0 +1,594 @@
+.. include:: beamerdefs.txt
+
+============================================
+The Story of Stackless Python
+============================================
+
+What is Stackless?
+-------------------
+
+* *Stackless is a Python version that does not use the C stack*
+
+ |pause|
+
+ - really? naah
+
+|pause|
+
+* Stackless is a Python version that does not keep state on the C stack
+
+ - the stack *is* used but
+
+ - cleared between function calls
+
+|pause|
+
+* Remark:
+
+ - theoretically. In practice...
+
+ - ... it is reasonable 90 % of the time
+
+ - we come back to this!
+
+
+What is Stackless about?
+-------------------------
+
+* it is like CPython
+
+|pause|
+
+* it can do a little bit more
+
+|pause|
+
+* adds a single builtin module
+
+|pause|
+
+|scriptsize|
+|example<| |>|
+
+ .. sourcecode:: python
+
+ import stackless
+
+|end_example|
+|end_scriptsize|
+
+|pause|
+
+* is like an extension
+
+ - but, sadly, not really
+ - stackless **must** be builtin
+ - **but:** there is a solution...
+
+
+Now, what is it really about?
+------------------------------
+
+* have tiny little "main" programs
+
+ - ``tasklet``
+
+|pause|
+
+* tasklets communicate via messages
+
+ - ``channel``
+
+|pause|
+
+* tasklets are often called ``microthreads``
+
+ - but there are no threads at all
+
+ - only one tasklets runs at any time
+
+|pause|
+
+* *but see the PyPy STM* approach
+
+ - this will apply to tasklets as well
+
+
+Cooperative Multitasking ...
+-------------------------------
+
+|scriptsize|
+|example<| |>|
+
+ .. sourcecode:: pycon
+
+ >>> import stackless
+ >>>
+ >>> channel = stackless.channel()
+
+|pause|
+
+ .. sourcecode:: pycon
+
+ >>> def receiving_tasklet():
+ ... print "Receiving tasklet started"
+ ... print channel.receive()
+ ... print "Receiving tasklet finished"
+ ...
+
+|pause|
+
+ .. sourcecode:: pycon
+
+ >>> def sending_tasklet():
+ ... print "Sending tasklet started"
+ ... channel.send("send from sending_tasklet")
+ ... print "sending tasklet finished"
+ ...
+
+|end_example|
+|end_scriptsize|
+
+
+... Cooperative Multitasking ...
+---------------------------------
+
+|scriptsize|
+|example<| |>|
+
+ .. sourcecode:: pycon
+
+ >>> def another_tasklet():
+ ... print "Just another tasklet in the scheduler"
+ ...
+
+|pause|
+
+ .. sourcecode:: pycon
+
+ >>> stackless.tasklet(receiving_tasklet)()
+ <stackless.tasklet object at 0x00A45B30>
+ >>> stackless.tasklet(sending_tasklet)()
+ <stackless.tasklet object at 0x00A45B70>
+ >>> stackless.tasklet(another_tasklet)()
+ <stackless.tasklet object at 0x00A45BF0>
+
+|end_example|
+|end_scriptsize|
+
+
+... Cooperative Multitasking
+-------------------------------
+
+|scriptsize|
+|example<| |>|
+
+ .. sourcecode:: pycon
+
+ <stackless.tasklet object at 0x00A45B70>
+ >>> stackless.tasklet(another_tasklet)()
+ <stackless.tasklet object at 0x00A45BF0>
+ >>>
+ >>> stackless.run()
+ Receiving tasklet started
+ Sending tasklet started
+ send from sending_tasklet
+ Receiving tasklet finished
+ Just another tasklet in the scheduler
+ sending tasklet finished
+
+|end_example|
+|end_scriptsize|
+
+
+Why not just the *greenlet* ?
+-------------------------------
+
+* greenlets are a subset of stackless
+
+ - can partially emulate stackless
+
+ - there is no builtin scheduler
+
+ - technology quite close to Stackless 2.0
+
+|pause|
+
+* greenlets are about 10x slower to switch context because
+ using only hard-switching
+
+ - but that's ok in most cases
+
+|pause|
+
+* greenlets are kind-of perfect
+
+ - near zero maintenace
+ - minimal interface
+
+|pause|
+
+* but the main difference is ...
+
+
+Pickling Program State
+-----------------------
+
+|scriptsize|
+|example<| Persistence (p. 1 of 2) |>|
+
+ .. sourcecode:: python
+
+ import pickle, sys
+ import stackless
+
+ ch = stackless.channel()
+
+ def recurs(depth, level=1):
+ print 'enter level %s%d' % (level*' ', level)
+ if level >= depth:
+ ch.send('hi')
+ if level < depth:
+ recurs(depth, level+1)
+ print 'leave level %s%d' % (level*' ', level)
+
+|end_example|
+
+# *remember to show it interactively*
+
+|end_scriptsize|
+
+
+Pickling Program State
+-----------------------
+
+|scriptsize|
+
+|example<| Persistence (p. 2 of 2) |>|
+
+ .. sourcecode:: python
+
+
+ def demo(depth):
+ t = stackless.tasklet(recurs)(depth)
+ print ch.receive()
+ pickle.dump(t, file('tasklet.pickle', 'wb'))
+
+ if __name__ == '__main__':
+ if len(sys.argv) > 1:
+ t = pickle.load(file(sys.argv[1], 'rb'))
+ t.insert()
+ else:
+ t = stackless.tasklet(demo)(9)
+ stackless.run()
+
+
+|end_example|
+
+# *remember to show it interactively*
+
+|end_scriptsize|
+
+
+Script Output 1
+-----------------
+
+|example<| |>|
+|scriptsize|
+
+ .. sourcecode:: pycon
+
+ $ ~/src/stackless/python.exe demo/pickledtasklet.py
+ enter level 1
+ enter level 2
+ enter level 3
+ enter level 4
+ enter level 5
+ enter level 6
+ enter level 7
+ enter level 8
+ enter level 9
+ hi
+ leave level 9
+ leave level 8
+ leave level 7
+ leave level 6
+ leave level 5
+ leave level 4
+ leave level 3
+ leave level 2
+ leave level 1
+
+|end_scriptsize|
+|end_example|
+
+
+Script Output 2
+-----------------
+
+|example<| |>|
+|scriptsize|
+
+ .. sourcecode:: pycon
+
+ $ ~/src/stackless/python.exe demo/pickledtasklet.py tasklet.pickle
+ leave level 9
+ leave level 8
+ leave level 7
+ leave level 6
+ leave level 5
+ leave level 4
+ leave level 3
+ leave level 2
+ leave level 1
+
+|end_scriptsize|
+|end_example|
+
+
+Greenlet vs. Stackless
+-----------------------
+
+* Greenlet is a pure extension module
+
+ - but performance is good enough
+
+|pause|
+
+* Stackless can pickle program state
+
+ - but stays a replacement of Python
+
+|pause|
+
+* Greenlet never can, as an extension
+
+|pause|
+
+* *easy installation* lets people select greenlet over stackless
+
+ - see for example the *eventlet* project
+
+ - *but there is a simple work-around, we'll come to it*
+
+|pause|
+
+* *they both have their application domains
+ and they will persist.*
+
+
+Why Stackless makes a Difference
+---------------------------------
+
+* Microthreads ?
+
+ - the feature where I put most effort into
+
+ |pause|
+
+ - can be emulated: (in decreasing speed order)
+
+ - generators (incomplete, "half-sided")
+
+ - greenlet
+
+ - threads (even ;-)
+
+|pause|
+
+* Pickling program state ! ==
+
+|pause|
+
+* **persistence**
+
+
+Persistence, Cloud Computing
+-----------------------------
+
+* freeze your running program
+
+* let it continue anywhere else
+
+ - on a different computer
+
+ - on a different operating system (!)
+
+ - in a cloud
+
+* migrate your running program
+
+* save snapshots, have checkpoints
+
+ - without doing any extra-work
+
+Software archeology
+-------------------
+
+* Around since 1998
+
+ - version 1
+
+ - using only soft-switching
+
+ - continuation-based
+
+ - *please let me skip old design errors :-)*
+
+|pause|
+
+* Complete redesign in 2002
+
+ - version 2
+
+ - using only hard-switching
+
+ - birth of tasklets and channels
+
+|pause|
+
+* Concept merge in 2004
+
+ - version 3
+
+ - **80-20** rule:
+
+ - soft-switching whenever possible
+
+ - hard-switching if foreign code is on the stack
+
+ - these 80 % can be *pickled* (90?)
+
+* This stayed as version 3.1
+
+Status of Stackless Python
+---------------------------
+
+* mature
+
+* Python 2 and Python 3, all versions
+
+* maintained by
+
+ - Richard Tew
+ - Kristjan Valur Jonsson
+ - me (a bit)
+
+
+The New Direction for Stackless
+-------------------------------
+
+* ``pip install stackless-python``
+
+ - will install ``slpython``
+ - or even ``python`` (opinions?)
+
+|pause|
+
+* drop-in replacement of CPython
+ *(psssst)*
+
+|pause|
+
+* ``pip uninstall stackless-python``
+
+ - Stackless is a bit cheating, as it replaces the python binary
+
+ - but the user perception will be perfect
+
+* *trying stackless made easy!*
+
+
+New Direction (cont'd)
+-----------------------
+
+* first prototype yesterday from
+
+ Anselm Kruis *(applause)*
+
+ - works on Windows
+
+ |pause|
+
+ - OS X
+
+ - I'll do that one
+
+ |pause|
+
+ - Linux
+
+ - soon as well
+
+|pause|
+
+* being very careful to stay compatible
+
+ - python 2.7.3 installs stackless for 2.7.3
+ - python 3.2.3 installs stackless for 3.2.3
+
+ - python 2.7.2 : *please upgrade*
+ - or maybe have an over-ride option?
+
+Consequences of the Pseudo-Package
+-----------------------------------
+
+The technical effect is almost nothing.
+
+The psycological impact is probably huge:
+
+|pause|
+
+* stackless is easy to install and uninstall
+
+|pause|
+
+* people can simply try if it fits their needs
+
+|pause|
+
+* the never ending discussion
+
+ - "Why is Stackless not included in the Python core?"
+
+|pause|
+
+* **has ended**
+
+ - "Why should we?"
+ - hey Guido :-)
+ - what a relief, for you and me
+
+
+Status of Stackless PyPy
+---------------------------
+
+* was completely implemented before the Jit
+
+ - together with
+ greenlets
+ coroutines
+
+ - not Jit compatible
+
+* was "too complete" with a 30% performance hit
+
+* new approach is almost ready
+
+ - with full Jit support
+ - but needs some fixing
+ - this *will* be efficient
+
+Applications using Stackless Python
+------------------------------------
+
+* The Eve Online MMORPG
+
+ http://www.eveonline.com/
+
+ - based their games on Stackless since 1998
+
+* science + computing ag, Anselm Kruis
+
+ https://ep2012.europython.eu/conference/p/anselm-kruis
+
+* The Nagare Web Framework
+
+ http://www.nagare.org/
+
+ - works because of Stackless Pickling
+
+* today's majority: persistence
+
+
+Thank you
+---------
+
+* the new Stackless Website
+ http://www.stackless.com/
+
+ - a **great** donation from Alain Pourier, *Nagare*
+
+* You can hire me as a consultant
+
+* Questions?
diff --git a/talk/ep2012/stackless/stylesheet.latex b/talk/ep2012/stackless/stylesheet.latex
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/stackless/stylesheet.latex
@@ -0,0 +1,11 @@
+\usetheme{Boadilla}
+\usecolortheme{whale}
+\setbeamercovered{transparent}
+\setbeamertemplate{navigation symbols}{}
+
+\definecolor{darkgreen}{rgb}{0, 0.5, 0.0}
+\newcommand{\docutilsrolegreen}[1]{\color{darkgreen}#1\normalcolor}
+\newcommand{\docutilsrolered}[1]{\color{red}#1\normalcolor}
+
+\newcommand{\green}[1]{\color{darkgreen}#1\normalcolor}
+\newcommand{\red}[1]{\color{red}#1\normalcolor}
diff --git a/talk/ep2012/stackless/title.latex b/talk/ep2012/stackless/title.latex
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/stackless/title.latex
@@ -0,0 +1,5 @@
+\begin{titlepage}
+\begin{figure}[h]
+\includegraphics[width=60px]{logo_small.png}
+\end{figure}
+\end{titlepage}
diff --git a/talk/ep2012/tools/demo.py b/talk/ep2012/tools/demo.py
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/tools/demo.py
@@ -0,0 +1,114 @@
+
+def simple():
+ for i in range(100000):
+ pass
+
+
+
+
+
+
+
+
+
+def bridge():
+ s = 0
+ for i in range(100000):
+ if i % 2:
+ s += 1
+ else:
+ s += 2
+
+
+
+
+
+
+
+def bridge_overflow():
+ s = 2
+ for i in range(100000):
+ s += i*i*i*i
+ return s
+
+
+
+
+
+
+
+
+def nested_loops():
+ s = 0
+ for i in range(10000):
+ for j in range(100000):
+ s += 1
+
+
+
+
+
+
+
+
+
+def inner1():
+ return 1
+
+def inlined_call():
+ s = 0
+ for i in range(10000):
+ s += inner1()
+
+
+
+
+
+
+
+
+
+def inner2(a):
+ for i in range(3):
+ a += 1
+ return a
+
+def inlined_call_loop():
+ s = 0
+ for i in range(100000):
+ s += inner2(i)
+
+
+
+
+
+
+class A(object):
+ def __init__(self, x):
+ if x % 2:
+ self.y = 3
+ self.x = x
+
+def object_maps():
+ l = [A(i) for i in range(100)]
+ s = 0
+ for i in range(1000000):
+ s += l[i % 100].x
+
+
+
+
+
+
+
+
+
+
+if __name__ == '__main__':
+ simple()
+ bridge()
+ bridge_overflow()
+ nested_loops()
+ inlined_call()
+ inlined_call_loop()
+ object_maps()
diff --git a/talk/ep2012/tools/talk.html b/talk/ep2012/tools/talk.html
new file mode 100644
--- /dev/null
+++ b/talk/ep2012/tools/talk.html
@@ -0,0 +1,120 @@
+<html>
+<head>
+ <meta name="viewport" content="width=1024, user-scalable=no">
+ <link rel="stylesheet" href="/home/fijal/src/deckjs/core/deck.core.css">
+ <link rel="stylesheet" href="web-2.0.css">
+ <link rel="stylesheet" href="/home/fijal/src/deckjs/themes/transition/horizontal-slide.css">
+ <script src="/home/fijal/src/deckjs/modernizr.custom.js"></script>
+ <script src="/home/fijal/src/deckjs/jquery-1.7.min.js"></script>
+ <script src="/home/fijal/src/deckjs/core/deck.core.js"></script>
+ <script>
+ $(function() {
+ $.deck('.slide');
+ });
+ </script>
+
+</head>
+<body class="deck-container">
+ <section class="slide" id="title-slide">
+ <h1>Performance analysis tools for JITted VMs</h1>
+ </section>
+ <section class="slide">
+ <h2>Who am I?</h2>
+ <ul>
+ <li>worked on PyPy for 5+ years</li>
+ <li>often presented with a task "my program runs slow"</li>
+ <li>never completely satisfied with present solutions</li>
+ <li class="slide">I'm not antisocial, just shy</li>
+ </ul>
+ </section>
+ <section class="slide">
+ <h2>The talk</h2>
+ <ul>
+ <li>apologies for a lack of advanced warning - this is a rant</li>
+ <div class="slide">
+ <li>I'll talk about tools</li>
+ <li>primarily profiling tools</li>
+ </div>
+ <div class="slide">
+ <li>lots of questions</li>
+ <li>not that many answers</li>
+ </div>
+ </ul>
+ </section>
+ <section class="slide">
+ <h2>Why ranting?</h2>
+ <ul>
+ <li>the topic at hand is hard</li>
+ <li>the mindset about tools is very much rooted in the static land</li>
+ </ul>
+ </section>
+ <section class="slide">
+ <h2>Profiling theory</h2>
+ <ul>
+ <li>you spend 90% of your time in 10% of the functions</li>
+ <li>hence you can start profiling after you're done developing</li>
+ <li>by optimizing few functions</li>
+ <div class="slide">
+ <li>problem - 10% of 600k lines is still 60k lines</li>
+ <li>that might be even 1000s of functions</li>
+ </div>
+ </ul>
+ </section>
+ <section class="slide">
+ <h2>Let's talk about profiling</h2>
+ <ul>
+ <li>I'll try profiling!</li>
+ </ul>
+ </section>
+ <section class="slide">
+ <h2>JITted landscape</h2>
+ <ul>
+ <li>you have to account for warmup times</li>
+ <li>time spent in functions is very context dependent</li>
+ </ul>
+ </section>
+ <section class="slide">
+ <h2>Let's try!</h2>
+ </section>
+ <section class="slide">
+ <h2>High level languages</h2>
+ <ul>
+ <li>in C relation C <-> assembler is "trivial"</li>
+ <li>in PyPy, V8 (JS) or luajit (lua), the mapping is far from trivial</li>
+ <div class="slide">
+ <li>multiple versions of the same code</li>
+ <li>bridges even if there is no branch in user code</li>
+ </div>
+ <li class="slide">sometimes I have absolutely no clue</li>
+ </ul>
+ </section>
+ <section class="slide">
+ <h2>The problem</h2>
+ <ul>
+ <li>what I've shown is pretty much the state of the art</li>
+ </ul>
+ </section>
+ <section class="slide">
+ <h2>Another problem</h2>
+ <ul>
+ <li>often when presented with profiling, it's already too late</li>
+ </ul>
+ </section>
+ <section class="slide">
+ <h2>Better tools</h2>
+ <ul>
+ <li>good vm-level instrumentation</li>
+ <li>better visualizations, more code oriented</li>
+ <li>hints at the editor level about your code</li>
+ <li>hints about coverage, tests</li>
+ </ul>
+ </section>
+ <section class="slide">
+ <h2></rant></h2>
+ <ul>
+ <li>good part - there are people working on it</li>
+ <li>questions, suggestions?</li>
+ </ul>
+ </section>
+</body>
+</html>
diff --git a/talk/ep2012/tools/talk.rst b/talk/ep2012/tools/talk.rst
--- a/talk/ep2012/tools/talk.rst
+++ b/talk/ep2012/tools/talk.rst
@@ -88,7 +88,7 @@
* I don't actually know, but I'll keep trying
-Q&A
-===
+Questions?
+==========
* I'm actually listening for advices
diff --git a/talk/ep2012/tools/web-2.0.css b/talk/ep2012/tools/web-2.0.css
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+.deck-container .deck-prev-link:hover, .deck-container .deck-prev-link:focus, .deck-container .deck-next-link:hover, .deck-container .deck-next-link:focus {
+ opacity: 1;
+ text-decoration: none;
+}
+.deck-container .deck-status {
+ font-size: 0.6666em;
+}
+.deck-container.deck-menu .slide {
+ background: transparent;
+ -webkit-border-radius: 5px;
+ -moz-border-radius: 5px;
+ border-radius: 5px;
+}
+.rgba .deck-container.deck-menu .slide {
+ background: rgba(0, 0, 0, 0.1);
+}
+.deck-container.deck-menu .slide.deck-current, .rgba .deck-container.deck-menu .slide.deck-current, .no-touch .deck-container.deck-menu .slide:hover {
+ background: #fff;
+}
+.deck-container .goto-form {
+ background: #fff;
+ border: 1px solid #cde;
+ -webkit-border-radius: 5px;
+ -moz-border-radius: 5px;
+ border-radius: 5px;
+}
+.boxshadow .deck-container .goto-form {
+ -webkit-box-shadow: 0 15px 10px -10px rgba(0, 0, 0, 0.5), 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
+ -moz-box-shadow: 0 15px 10px -10px rgba(0, 0, 0, 0.5), 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
+ box-shadow: 0 15px 10px -10px rgba(0, 0, 0, 0.5), 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
+}
diff --git a/talk/vmil2012/Makefile b/talk/vmil2012/Makefile
new file mode 100644
--- /dev/null
+++ b/talk/vmil2012/Makefile
@@ -0,0 +1,13 @@
+
+jit-guards.pdf: paper.tex paper.bib
+ pdflatex paper
+ bibtex paper
+ pdflatex paper
+ pdflatex paper
+ mv paper.pdf jit-guards.pdf
+
+view: jit-guards.pdf
+ evince jit-guards.pdf &
+
+%.tex: %.py
+ pygmentize -l python -o $@ $<
diff --git a/talk/vmil2012/paper.bib b/talk/vmil2012/paper.bib
new file mode 100644
diff --git a/talk/vmil2012/paper.tex b/talk/vmil2012/paper.tex
new file mode 100644
--- /dev/null
+++ b/talk/vmil2012/paper.tex
@@ -0,0 +1,209 @@
+\documentclass{sigplanconf}
+
+\usepackage{ifthen}
+\usepackage{fancyvrb}
+\usepackage{color}
+\usepackage{wrapfig}
+\usepackage{ulem}
+\usepackage{xspace}
+\usepackage{relsize}
+\usepackage{epsfig}
+\usepackage{amssymb}
+\usepackage{amsmath}
+\usepackage{amsfonts}
+\usepackage[utf8]{inputenc}
+\usepackage{setspace}
+
+\usepackage{listings}
+
+\usepackage[T1]{fontenc}
+\usepackage[scaled=0.81]{beramono}
+
+
+\definecolor{commentgray}{rgb}{0.3,0.3,0.3}
+
+\lstset{
+ basicstyle=\ttfamily\footnotesize,
+ language=Python,
+ keywordstyle=\bfseries,
+ stringstyle=\color{blue},
+ commentstyle=\color{commentgray}\textit,
+ fancyvrb=true,
+ showstringspaces=false,
+ %keywords={def,while,if,elif,return,class,get,set,new,guard_class}
+ numberstyle = \tiny,
+ numbersep = -20pt,
+}
+
+\newboolean{showcomments}
+\setboolean{showcomments}{false}
+\ifthenelse{\boolean{showcomments}}
+ {\newcommand{\nb}[2]{
+ \fbox{\bfseries\sffamily\scriptsize#1}
+ {\sf\small$\blacktriangleright$\textit{#2}$\blacktriangleleft$}
+ }
+ \newcommand{\version}{\emph{\scriptsize$-$Id: main.tex 19055 2008-06-05 11:20:31Z cfbolz $-$}}
+ }
+ {\newcommand{\nb}[2]{}
+ \newcommand{\version}{}
+ }
+
+\newcommand\cfbolz[1]{\nb{CFB}{#1}}
+\newcommand\toon[1]{\nb{TOON}{#1}}
+\newcommand\anto[1]{\nb{ANTO}{#1}}
+\newcommand\arigo[1]{\nb{AR}{#1}}
+\newcommand\fijal[1]{\nb{FIJAL}{#1}}
+\newcommand\pedronis[1]{\nb{PEDRONIS}{#1}}
+\newcommand{\commentout}[1]{}
+
+\newcommand{\noop}{}
+
+
+\newcommand\ie{i.e.,\xspace}
+\newcommand\eg{e.g.,\xspace}
+
+\normalem
+
+\let\oldcite=\cite
+
+\renewcommand\cite[1]{\ifthenelse{\equal{#1}{XXX}}{[citation~needed]}{\oldcite{#1}}}
+
+\definecolor{gray}{rgb}{0.5,0.5,0.5}
+
+\begin{document}
+
+\title{Efficiently Handling Guards in the low level design of RPython's tracing JIT}
+
+\authorinfo{Carl Friedrich Bolz$^a$ \and David Schneider$^{a}$}
+ {$^a$Heinrich-Heine-Universität Düsseldorf, STUPS Group, Germany
+ }
+ {XXX emails}
+
+\conferenceinfo{VMIL'11}{}
+\CopyrightYear{2012}
+\crdata{}
+
+\maketitle
+
+\category{D.3.4}{Programming Languages}{Processors}[code generation,
+incremental compilers, interpreters, run-time environments]
+
+\terms
+Languages, Performance, Experimentation
+
+\keywords{XXX}
+
+\begin{abstract}
+
+\end{abstract}
+
+
+%___________________________________________________________________________
+\section{Introduction}
+
+
+The contributions of this paper are:
+\begin{itemize}
+ \item
+\end{itemize}
+
+The paper is structured as follows:
+
+\section{Background}
+\label{sec:Background}
+
+\subsection{RPython and the PyPy Project}
+\label{sub:pypy}
+
+
+The RPython language and the PyPy Project were started in 2002 with the goal of
+creating a python interpreter written in a High level language, allowing easy
+language experimentation and extension. PyPy is now a fully compatible
+alternative implementation of the Python language, xxx mention speed. The
+Implementation takes advantage of the language features provided by RPython
+such as the provided tracing just-in-time compiler described below.
+
+RPython, the language and the toolset originally developed to implement the
+Python interpreter have developed into a general environment for experimenting
+and developing fast and maintainable dynamic language implementations. xxx Mention
+the different language impls.
+
+RPython is built of two components, the language and the translation toolchain
+used to transform RPython programs to executable units. The RPython language
+is a statically typed object oriented high level language. The language provides
+several features such as automatic memory management (aka. Garbage Collection)
+and just-in-time compilation. When writing an interpreter using RPython the
+programmer only has to write the interpreter for the language she is
+implementing. The second RPython component, the translation toolchain, is used
+to transform the program to a low level representations suited to be compiled
+and run on one of the different supported target platforms/architectures such
+as C, .NET and Java. During the transformation process
+different low level aspects suited for the target environment are automatically
+added to program such as (if needed) a garbage collector and with some hints
+provided by the author a just-in-time compiler.
+
+
+
+\subsection{PyPy's Meta-Tracing JIT Compilers}
+\label{sub:tracing}
+
+ * Tracing JITs
+ * JIT Compiler
+ * describe the tracing jit stuff in pypy
+ * reference tracing the meta level paper for a high level description of what the JIT does
+ * JIT Architecture
+ * Explain the aspects of tracing and optimization
+
+%___________________________________________________________________________
+
+
+\section{Resume Data}
+\label{sec:Resume Data}
+
+* High level handling of resumedata
+ * trade-off fast tracing v/s memory usage
+ * creation in the frontendÂ
+ * optimization
+ * compression
+ * interaction with optimization
+ * tracing and attaching bridges and throwing away resume data
+ * compiling bridges
+
+% section Resume Data (end)
+
+\section{Guards in the Backend}
+\label{sec:Guards in the Backend}
+
+* Low level handling of guards
+ * Fast guard checks v/s memory usage
+ * memory efficient encoding of low level resume data
+ * fast checks for guard conditions
+ * slow bail out
+
+% section Guards in the Backend (end)
+
+%___________________________________________________________________________
+
+
+\section{Evaluation}
+\label{sec:evaluation}
+
+* Evaluation
+ * Measure guard memory consumption and machine code size
+ * Extrapolate memory consumption for guard other guard encodings
+ * compare to naive variant
+ * Measure how many guards survive optimization
+ * Measure the of guards and how many of these ever fail
+
+\section{Related Work}
+
+
+\section{Conclusion}
+
+
+\section*{Acknowledgements}
+
+\bibliographystyle{abbrv}
+\bibliography{paper}
+
+\end{document}
diff --git a/talk/vmil2012/sigplanconf.cls b/talk/vmil2012/sigplanconf.cls
new file mode 100644
--- /dev/null
+++ b/talk/vmil2012/sigplanconf.cls
@@ -0,0 +1,1250 @@
+%-----------------------------------------------------------------------------
+%
+% LaTeX Class/Style File
+%
+% Name: sigplanconf.cls
+% Purpose: A LaTeX 2e class file for SIGPLAN conference proceedings.
+% This class file supercedes acm_proc_article-sp,
+% sig-alternate, and sigplan-proc.
+%
+% Author: Paul C. Anagnostopoulos
+% Windfall Software
+% 978 371-2316
+% paul at windfall.com
+%
+% Created: 12 September 2004
+%
+% Revisions: See end of file.
+%
+%-----------------------------------------------------------------------------
+
+
+\NeedsTeXFormat{LaTeX2e}[1995/12/01]
+\ProvidesClass{sigplanconf}[2009/09/30 v2.3 ACM SIGPLAN Proceedings]
+
+% The following few pages contain LaTeX programming extensions adapted
+% from the ZzTeX macro package.
+
+% Token Hackery
+% ----- -------
+
+
+\def \@expandaftertwice {\expandafter\expandafter\expandafter}
+\def \@expandafterthrice {\expandafter\expandafter\expandafter\expandafter
+ \expandafter\expandafter\expandafter}
+
+% This macro discards the next token.
+
+\def \@discardtok #1{}% token
+
+% This macro removes the `pt' following a dimension.
+
+{\catcode `\p = 12 \catcode `\t = 12
+
+\gdef \@remover #1pt{#1}
+
+} % \catcode
+
+% This macro extracts the contents of a macro and returns it as plain text.
+% Usage: \expandafter\@defof \meaning\macro\@mark
+
+\def \@defof #1:->#2\@mark{#2}
+
+% Control Sequence Names
+% ------- -------- -----
+
+
+\def \@name #1{% {\tokens}
+ \csname \expandafter\@discardtok \string#1\endcsname}
+
+\def \@withname #1#2{% {\command}{\tokens}
+ \expandafter#1\csname \expandafter\@discardtok \string#2\endcsname}
+
+% Flags (Booleans)
+% ----- ----------
+
+% The boolean literals \@true and \@false are appropriate for use with
+% the \if command, which tests the codes of the next two characters.
+
+\def \@true {TT}
+\def \@false {FL}
+
+\def \@setflag #1=#2{\edef #1{#2}}% \flag = boolean
+
+% IF and Predicates
+% -- --- ----------
+
+% A "predicate" is a macro that returns \@true or \@false as its value.
+% Such values are suitable for use with the \if conditional. For example:
+%
+% \if \@oddp{\x} <then-clause> \else <else-clause> \fi
+
+% A predicate can be used with \@setflag as follows:
+%
+% \@setflag \flag = {<predicate>}
+
+% Here are the predicates for TeX's repertoire of conditional
+% commands. These might be more appropriately interspersed with
+% other definitions in this module, but what the heck.
+% Some additional "obvious" predicates are defined.
+
+\def \@eqlp #1#2{\ifnum #1 = #2\@true \else \@false \fi}
+\def \@neqlp #1#2{\ifnum #1 = #2\@false \else \@true \fi}
+\def \@lssp #1#2{\ifnum #1 < #2\@true \else \@false \fi}
+\def \@gtrp #1#2{\ifnum #1 > #2\@true \else \@false \fi}
+\def \@zerop #1{\ifnum #1 = 0\@true \else \@false \fi}
+\def \@onep #1{\ifnum #1 = 1\@true \else \@false \fi}
+\def \@posp #1{\ifnum #1 > 0\@true \else \@false \fi}
+\def \@negp #1{\ifnum #1 < 0\@true \else \@false \fi}
+\def \@oddp #1{\ifodd #1\@true \else \@false \fi}
+\def \@evenp #1{\ifodd #1\@false \else \@true \fi}
+\def \@rangep #1#2#3{\if \@orp{\@lssp{#1}{#2}}{\@gtrp{#1}{#3}}\@false \else
+ \@true \fi}
+\def \@tensp #1{\@rangep{#1}{10}{19}}
+
+\def \@dimeqlp #1#2{\ifdim #1 = #2\@true \else \@false \fi}
+\def \@dimneqlp #1#2{\ifdim #1 = #2\@false \else \@true \fi}
+\def \@dimlssp #1#2{\ifdim #1 < #2\@true \else \@false \fi}
+\def \@dimgtrp #1#2{\ifdim #1 > #2\@true \else \@false \fi}
+\def \@dimzerop #1{\ifdim #1 = 0pt\@true \else \@false \fi}
+\def \@dimposp #1{\ifdim #1 > 0pt\@true \else \@false \fi}
+\def \@dimnegp #1{\ifdim #1 < 0pt\@true \else \@false \fi}
+
+\def \@vmodep {\ifvmode \@true \else \@false \fi}
+\def \@hmodep {\ifhmode \@true \else \@false \fi}
+\def \@mathmodep {\ifmmode \@true \else \@false \fi}
+\def \@textmodep {\ifmmode \@false \else \@true \fi}
+\def \@innermodep {\ifinner \@true \else \@false \fi}
+
+\long\def \@codeeqlp #1#2{\if #1#2\@true \else \@false \fi}
+
+\long\def \@cateqlp #1#2{\ifcat #1#2\@true \else \@false \fi}
+
+\long\def \@tokeqlp #1#2{\ifx #1#2\@true \else \@false \fi}
+\long\def \@xtokeqlp #1#2{\expandafter\ifx #1#2\@true \else \@false \fi}
+
+\long\def \@definedp #1{%
+ \expandafter\ifx \csname \expandafter\@discardtok \string#1\endcsname
+ \relax \@false \else \@true \fi}
+
+\long\def \@undefinedp #1{%
+ \expandafter\ifx \csname \expandafter\@discardtok \string#1\endcsname
+ \relax \@true \else \@false \fi}
+
+\def \@emptydefp #1{\ifx #1\@empty \@true \else \@false \fi}% {\name}
+
+\let \@emptylistp = \@emptydefp
+
+\long\def \@emptyargp #1{% {#n}
+ \@empargp #1\@empargq\@mark}
+\long\def \@empargp #1#2\@mark{%
+ \ifx #1\@empargq \@true \else \@false \fi}
+\def \@empargq {\@empargq}
+
+\def \@emptytoksp #1{% {\tokenreg}
+ \expandafter\@emptoksp \the#1\@mark}
+
+\long\def \@emptoksp #1\@mark{\@emptyargp{#1}}
+
+\def \@voidboxp #1{\ifvoid #1\@true \else \@false \fi}
+\def \@hboxp #1{\ifhbox #1\@true \else \@false \fi}
+\def \@vboxp #1{\ifvbox #1\@true \else \@false \fi}
+
+\def \@eofp #1{\ifeof #1\@true \else \@false \fi}
+
+
+% Flags can also be used as predicates, as in:
+%
+% \if \flaga <then-clause> \else <else-clause> \fi
+
+
+% Now here we have predicates for the common logical operators.
+
+\def \@notp #1{\if #1\@false \else \@true \fi}
+
+\def \@andp #1#2{\if #1%
+ \if #2\@true \else \@false \fi
+ \else
+ \@false
+ \fi}
+
+\def \@orp #1#2{\if #1%
+ \@true
+ \else
+ \if #2\@true \else \@false \fi
+ \fi}
+
+\def \@xorp #1#2{\if #1%
+ \if #2\@false \else \@true \fi
+ \else
+ \if #2\@true \else \@false \fi
+ \fi}
+
+% Arithmetic
+% ----------
+
+\def \@increment #1{\advance #1 by 1\relax}% {\count}
+
+\def \@decrement #1{\advance #1 by -1\relax}% {\count}
+
+% Options
+% -------
+
+
+\@setflag \@authoryear = \@false
+\@setflag \@blockstyle = \@false
+\@setflag \@copyrightwanted = \@true
+\@setflag \@explicitsize = \@false
+\@setflag \@mathtime = \@false
+\@setflag \@natbib = \@true
+\@setflag \@ninepoint = \@true
+\newcount{\@numheaddepth} \@numheaddepth = 3
+\@setflag \@onecolumn = \@false
+\@setflag \@preprint = \@false
+\@setflag \@reprint = \@false
+\@setflag \@tenpoint = \@false
+\@setflag \@times = \@false
+
+% Note that all the dangerous article class options are trapped.
+
+\DeclareOption{9pt}{\@setflag \@ninepoint = \@true
+ \@setflag \@explicitsize = \@true}
+
+\DeclareOption{10pt}{\PassOptionsToClass{10pt}{article}%
+ \@setflag \@ninepoint = \@false
+ \@setflag \@tenpoint = \@true
+ \@setflag \@explicitsize = \@true}
+
+\DeclareOption{11pt}{\PassOptionsToClass{11pt}{article}%
+ \@setflag \@ninepoint = \@false
+ \@setflag \@explicitsize = \@true}
+
+\DeclareOption{12pt}{\@unsupportedoption{12pt}}
+
+\DeclareOption{a4paper}{\@unsupportedoption{a4paper}}
+
+\DeclareOption{a5paper}{\@unsupportedoption{a5paper}}
+
+\DeclareOption{authoryear}{\@setflag \@authoryear = \@true}
+
+\DeclareOption{b5paper}{\@unsupportedoption{b5paper}}
+
+\DeclareOption{blockstyle}{\@setflag \@blockstyle = \@true}
+
+\DeclareOption{cm}{\@setflag \@times = \@false}
+
+\DeclareOption{computermodern}{\@setflag \@times = \@false}
+
+\DeclareOption{executivepaper}{\@unsupportedoption{executivepaper}}
+
+\DeclareOption{indentedstyle}{\@setflag \@blockstyle = \@false}
+
+\DeclareOption{landscape}{\@unsupportedoption{landscape}}
+
+\DeclareOption{legalpaper}{\@unsupportedoption{legalpaper}}
+
+\DeclareOption{letterpaper}{\@unsupportedoption{letterpaper}}
+
+\DeclareOption{mathtime}{\@setflag \@mathtime = \@true}
+
+\DeclareOption{natbib}{\@setflag \@natbib = \@true}
+
+\DeclareOption{nonatbib}{\@setflag \@natbib = \@false}
+
+\DeclareOption{nocopyrightspace}{\@setflag \@copyrightwanted = \@false}
+
+\DeclareOption{notitlepage}{\@unsupportedoption{notitlepage}}
+
+\DeclareOption{numberedpars}{\@numheaddepth = 4}
+
+\DeclareOption{numbers}{\@setflag \@authoryear = \@false}
+
+%%%\DeclareOption{onecolumn}{\@setflag \@onecolumn = \@true}
+
+\DeclareOption{preprint}{\@setflag \@preprint = \@true}
+
+\DeclareOption{reprint}{\@setflag \@reprint = \@true}
+
+\DeclareOption{times}{\@setflag \@times = \@true}
+
+\DeclareOption{titlepage}{\@unsupportedoption{titlepage}}
+
+\DeclareOption{twocolumn}{\@setflag \@onecolumn = \@false}
+
+\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
+
+\ExecuteOptions{9pt,indentedstyle,times}
+\@setflag \@explicitsize = \@false
+\ProcessOptions
+
+\if \@onecolumn
+ \if \@notp{\@explicitsize}%
+ \@setflag \@ninepoint = \@false
+ \PassOptionsToClass{11pt}{article}%
+ \fi
+ \PassOptionsToClass{twoside,onecolumn}{article}
+\else
+ \PassOptionsToClass{twoside,twocolumn}{article}
+\fi
+\LoadClass{article}
+
+\def \@unsupportedoption #1{%
+ \ClassError{proc}{The standard '#1' option is not supported.}}
+
+% This can be used with the 'reprint' option to get the final folios.
+
+\def \setpagenumber #1{%
+ \setcounter{page}{#1}}
+
+\AtEndDocument{\label{sigplanconf at finalpage}}
+
+% Utilities
+% ---------
+
+
+\newcommand{\setvspace}[2]{%
+ #1 = #2
+ \advance #1 by -1\parskip}
+
+% Document Parameters
+% -------- ----------
+
+
+% Page:
+
+\setlength{\hoffset}{-1in}
+\setlength{\voffset}{-1in}
+
+\setlength{\topmargin}{1in}
+\setlength{\headheight}{0pt}
+\setlength{\headsep}{0pt}
+
+\if \@onecolumn
+ \setlength{\evensidemargin}{.75in}
+ \setlength{\oddsidemargin}{.75in}
+\else
+ \setlength{\evensidemargin}{.75in}
+ \setlength{\oddsidemargin}{.75in}
+\fi
+
+% Text area:
+
+\newdimen{\standardtextwidth}
+\setlength{\standardtextwidth}{42pc}
+
+\if \@onecolumn
+ \setlength{\textwidth}{40.5pc}
+\else
+ \setlength{\textwidth}{\standardtextwidth}
+\fi
+
+\setlength{\topskip}{8pt}
+\setlength{\columnsep}{2pc}
+\setlength{\textheight}{54.5pc}
+
+% Running foot:
+
+\setlength{\footskip}{30pt}
+
+% Paragraphs:
+
+\if \@blockstyle
+ \setlength{\parskip}{5pt plus .1pt minus .5pt}
+ \setlength{\parindent}{0pt}
+\else
+ \setlength{\parskip}{0pt}
+ \setlength{\parindent}{12pt}
+\fi
+
+\setlength{\lineskip}{.5pt}
+\setlength{\lineskiplimit}{\lineskip}
+
+\frenchspacing
+\pretolerance = 400
+\tolerance = \pretolerance
+\setlength{\emergencystretch}{5pt}
+\clubpenalty = 10000
+\widowpenalty = 10000
+\setlength{\hfuzz}{.5pt}
+
+% Standard vertical spaces:
+
+\newskip{\standardvspace}
+\setvspace{\standardvspace}{5pt plus 1pt minus .5pt}
+
+% Margin paragraphs:
+
+\setlength{\marginparwidth}{36pt}
+\setlength{\marginparsep}{2pt}
+\setlength{\marginparpush}{8pt}
+
+
+\setlength{\skip\footins}{8pt plus 3pt minus 1pt}
+\setlength{\footnotesep}{9pt}
+
+\renewcommand{\footnoterule}{%
+ \hrule width .5\columnwidth height .33pt depth 0pt}
+
+\renewcommand{\@makefntext}[1]{%
+ \noindent \@makefnmark \hspace{1pt}#1}
+
+% Floats:
+
+\setcounter{topnumber}{4}
+\setcounter{bottomnumber}{1}
+\setcounter{totalnumber}{4}
+
+\renewcommand{\fps at figure}{tp}
+\renewcommand{\fps at table}{tp}
+\renewcommand{\topfraction}{0.90}
+\renewcommand{\bottomfraction}{0.30}
+\renewcommand{\textfraction}{0.10}
+\renewcommand{\floatpagefraction}{0.75}
+
+\setcounter{dbltopnumber}{4}
+
+\renewcommand{\dbltopfraction}{\topfraction}
+\renewcommand{\dblfloatpagefraction}{\floatpagefraction}
+
+\setlength{\floatsep}{18pt plus 4pt minus 2pt}
+\setlength{\textfloatsep}{18pt plus 4pt minus 3pt}
+\setlength{\intextsep}{10pt plus 4pt minus 3pt}
+
+\setlength{\dblfloatsep}{18pt plus 4pt minus 2pt}
+\setlength{\dbltextfloatsep}{20pt plus 4pt minus 3pt}
+
+% Miscellaneous:
+
+\errorcontextlines = 5
+
+% Fonts
+% -----
+
+
+\if \@times
+ \renewcommand{\rmdefault}{ptm}%
+ \if \@mathtime
+ \usepackage[mtbold,noTS1]{mathtime}%
+ \else
+%%% \usepackage{mathptm}%
+ \fi
+\else
+ \relax
+\fi
+
+\if \@ninepoint
+
+\renewcommand{\normalsize}{%
+ \@setfontsize{\normalsize}{9pt}{10pt}%
+ \setlength{\abovedisplayskip}{5pt plus 1pt minus .5pt}%
+ \setlength{\belowdisplayskip}{\abovedisplayskip}%
+ \setlength{\abovedisplayshortskip}{3pt plus 1pt minus 2pt}%
+ \setlength{\belowdisplayshortskip}{\abovedisplayshortskip}}
+
+\renewcommand{\tiny}{\@setfontsize{\tiny}{5pt}{6pt}}
+
+\renewcommand{\scriptsize}{\@setfontsize{\scriptsize}{7pt}{8pt}}
+
+\renewcommand{\small}{%
+ \@setfontsize{\small}{8pt}{9pt}%
+ \setlength{\abovedisplayskip}{4pt plus 1pt minus 1pt}%
+ \setlength{\belowdisplayskip}{\abovedisplayskip}%
+ \setlength{\abovedisplayshortskip}{2pt plus 1pt}%
+ \setlength{\belowdisplayshortskip}{\abovedisplayshortskip}}
+
+\renewcommand{\footnotesize}{%
+ \@setfontsize{\footnotesize}{8pt}{9pt}%
+ \setlength{\abovedisplayskip}{4pt plus 1pt minus .5pt}%
+ \setlength{\belowdisplayskip}{\abovedisplayskip}%
+ \setlength{\abovedisplayshortskip}{2pt plus 1pt}%
+ \setlength{\belowdisplayshortskip}{\abovedisplayshortskip}}
+
+\renewcommand{\large}{\@setfontsize{\large}{11pt}{13pt}}
+
+\renewcommand{\Large}{\@setfontsize{\Large}{14pt}{18pt}}
+
+\renewcommand{\LARGE}{\@setfontsize{\LARGE}{18pt}{20pt}}
+
+\renewcommand{\huge}{\@setfontsize{\huge}{20pt}{25pt}}
+
+\renewcommand{\Huge}{\@setfontsize{\Huge}{25pt}{30pt}}
+
+\else\if \@tenpoint
+
+\relax
+
+\else
+
+\relax
+
+\fi\fi
+
+% Abstract
+% --------
+
+
+\renewenvironment{abstract}{%
+ \section*{Abstract}%
+ \normalsize}{%
+ }
+
+% Bibliography
+% ------------
+
+
+\renewenvironment{thebibliography}[1]
+ {\section*{\refname
+ \@mkboth{\MakeUppercase\refname}{\MakeUppercase\refname}}%
+ \list{\@biblabel{\@arabic\c at enumiv}}%
+ {\settowidth\labelwidth{\@biblabel{#1}}%
+ \leftmargin\labelwidth
+ \advance\leftmargin\labelsep
+ \@openbib at code
+ \usecounter{enumiv}%
+ \let\p at enumiv\@empty
+ \renewcommand\theenumiv{\@arabic\c at enumiv}}%
+ \bibfont
+ \clubpenalty4000
+ \@clubpenalty \clubpenalty
+ \widowpenalty4000%
+ \sfcode`\.\@m}
+ {\def\@noitemerr
+ {\@latex at warning{Empty `thebibliography' environment}}%
+ \endlist}
+
+\if \@natbib
+
+\if \@authoryear
+ \typeout{Using natbib package with 'authoryear' citation style.}
+ \usepackage[authoryear,sort,square]{natbib}
+ \bibpunct{[}{]}{;}{a}{}{,} % Change citation separator to semicolon,
+ % eliminate comma between author and year.
+ \let \cite = \citep
+\else
+ \typeout{Using natbib package with 'numbers' citation style.}
+ \usepackage[numbers,sort&compress,square]{natbib}
+\fi
+\setlength{\bibsep}{3pt plus .5pt minus .25pt}
+
+\fi
+
+\def \bibfont {\small}
+
+% Categories
+% ----------
+
+
+\@setflag \@firstcategory = \@true
+
+\newcommand{\category}[3]{%
+ \if \@firstcategory
+ \paragraph*{Categories and Subject Descriptors}%
+ \@setflag \@firstcategory = \@false
+ \else
+ \unskip ;\hspace{.75em}%
+ \fi
+ \@ifnextchar [{\@category{#1}{#2}{#3}}{\@category{#1}{#2}{#3}[]}}
+
+\def \@category #1#2#3[#4]{%
+ {\let \and = \relax
+ #1 [\textit{#2}]%
+ \if \@emptyargp{#4}%
+ \if \@notp{\@emptyargp{#3}}: #3\fi
+ \else
+ :\space
+ \if \@notp{\@emptyargp{#3}}#3---\fi
+ \textrm{#4}%
+ \fi}}
+
+% Copyright Notice
+% --------- ------
+
+
+\def \ftype at copyrightbox {8}
+\def \@toappear {}
+\def \@permission {}
+\def \@reprintprice {}
+
+\def \@copyrightspace {%
+ \@float{copyrightbox}[b]%
+ \vbox to 1in{%
+ \vfill
+ \parbox[b]{20pc}{%
+ \scriptsize
+ \if \@preprint
+ [Copyright notice will appear here
+ once 'preprint' option is removed.]\par
+ \else
+ \@toappear
+ \fi
+ \if \@reprint
+ \noindent Reprinted from \@conferencename,
+ \@proceedings,
+ \@conferenceinfo,
+ pp.~\number\thepage--\pageref{sigplanconf at finalpage}.\par
+ \fi}}%
+ \end at float}
+
+\long\def \toappear #1{%
+ \def \@toappear {#1}}
+
+\toappear{%
+ \noindent \@permission \par
+ \vspace{2pt}
+ \noindent \textsl{\@conferencename}\quad \@conferenceinfo \par
+ \noindent Copyright \copyright\ \@copyrightyear\ ACM \@copyrightdata
+ \dots \@reprintprice\par}
+
+\newcommand{\permission}[1]{%
+ \gdef \@permission {#1}}
+
+\permission{%
+ Permission to make digital or hard copies of all or
+ part of this work for personal or classroom use is granted without
+ fee provided that copies are not made or distributed for profit or
+ commercial advantage and that copies bear this notice and the full
+ citation on the first page. To copy otherwise, to republish, to
+ post on servers or to redistribute to lists, requires prior specific
+ permission and/or a fee.}
+
+% Here we have some alternate permission statements and copyright lines:
+
+\newcommand{\ACMCanadapermission}{%
+ \permission{%
+ Copyright \@copyrightyear\ Association for Computing Machinery.
+ ACM acknowledges that
+ this contribution was authored or co-authored by an affiliate of the
+ National Research Council of Canada (NRC).
+ As such, the Crown in Right of
+ Canada retains an equal interest in the copyright, however granting
+ nonexclusive, royalty-free right to publish or reproduce this article,
+ or to allow others to do so, provided that clear attribution
+ is also given to the authors and the NRC.}}
+
+\newcommand{\ACMUSpermission}{%
+ \permission{%
+ Copyright \@copyrightyear\ Association for
+ Computing Machinery. ACM acknowledges that
+ this contribution was authored or co-authored
+ by a contractor or affiliate
+ of the U.S. Government. As such, the Government retains a nonexclusive,
+ royalty-free right to publish or reproduce this article,
+ or to allow others to do so, for Government purposes only.}}
+
+\newcommand{\authorpermission}{%
+ \permission{%
+ Copyright is held by the author/owner(s).}
+ \toappear{%
+ \noindent \@permission \par
+ \vspace{2pt}
+ \noindent \textsl{\@conferencename}\quad \@conferenceinfo \par
+ ACM \@copyrightdata.}}
+
+\newcommand{\Sunpermission}{%
+ \permission{%
+ Copyright is held by Sun Microsystems, Inc.}%
+ \toappear{%
+ \noindent \@permission \par
+ \vspace{2pt}
+ \noindent \textsl{\@conferencename}\quad \@conferenceinfo \par
+ ACM \@copyrightdata.}}
+
+\newcommand{\USpublicpermission}{%
+ \permission{%
+ This paper is authored by an employee(s) of the United States
+ Government and is in the public domain.}%
+ \toappear{%
+ \noindent \@permission \par
+ \vspace{2pt}
+ \noindent \textsl{\@conferencename}\quad \@conferenceinfo \par
+ ACM \@copyrightdata.}}
+
+\newcommand{\reprintprice}[1]{%
+ \gdef \@reprintprice {#1}}
+
+\reprintprice{\$10.00}
+
+% Enunciations
+% ------------
+
+
+\def \@begintheorem #1#2{% {name}{number}
+ \trivlist
+ \item[\hskip \labelsep \textsc{#1 #2.}]%
+ \itshape\selectfont
+ \ignorespaces}
+
+\def \@opargbegintheorem #1#2#3{% {name}{number}{title}
+ \trivlist
+ \item[%
+ \hskip\labelsep \textsc{#1\ #2}%
+ \if \@notp{\@emptyargp{#3}}\nut (#3).\fi]%
+ \itshape\selectfont
+ \ignorespaces}
+
+% Figures
+% -------
+
+
+\@setflag \@caprule = \@true
+
+\long\def \@makecaption #1#2{%
+ \addvspace{4pt}
+ \if \@caprule
+ \hrule width \hsize height .33pt
+ \vspace{4pt}
+ \fi
+ \setbox \@tempboxa = \hbox{\@setfigurenumber{#1.}\nut #2}%
+ \if \@dimgtrp{\wd\@tempboxa}{\hsize}%
+ \noindent \@setfigurenumber{#1.}\nut #2\par
+ \else
+ \centerline{\box\@tempboxa}%
+ \fi}
+
+\newcommand{\nocaptionrule}{%
+ \@setflag \@caprule = \@false}
+
+\def \@setfigurenumber #1{%
+ {\rmfamily \bfseries \selectfont #1}}
+
+% Hierarchy
+% ---------
+
+
+\setcounter{secnumdepth}{\@numheaddepth}
+
+\newskip{\@sectionaboveskip}
+\setvspace{\@sectionaboveskip}{10pt plus 3pt minus 2pt}
+
+\newskip{\@sectionbelowskip}
+\if \@blockstyle
+ \setlength{\@sectionbelowskip}{0.1pt}%
+\else
+ \setlength{\@sectionbelowskip}{4pt}%
+\fi
+
+\renewcommand{\section}{%
+ \@startsection
+ {section}%
+ {1}%
+ {0pt}%
+ {-\@sectionaboveskip}%
+ {\@sectionbelowskip}%
+ {\large \bfseries \raggedright}}
+
+\newskip{\@subsectionaboveskip}
+\setvspace{\@subsectionaboveskip}{8pt plus 2pt minus 2pt}
+
+\newskip{\@subsectionbelowskip}
+\if \@blockstyle
+ \setlength{\@subsectionbelowskip}{0.1pt}%
+\else
+ \setlength{\@subsectionbelowskip}{4pt}%
+\fi
+
+\renewcommand{\subsection}{%
+ \@startsection%
+ {subsection}%
+ {2}%
+ {0pt}%
+ {-\@subsectionaboveskip}%
+ {\@subsectionbelowskip}%
+ {\normalsize \bfseries \raggedright}}
+
+\renewcommand{\subsubsection}{%
+ \@startsection%
+ {subsubsection}%
+ {3}%
+ {0pt}%
+ {-\@subsectionaboveskip}
+ {\@subsectionbelowskip}%
+ {\normalsize \bfseries \raggedright}}
+
+\newskip{\@paragraphaboveskip}
+\setvspace{\@paragraphaboveskip}{6pt plus 2pt minus 2pt}
+
+\renewcommand{\paragraph}{%
+ \@startsection%
+ {paragraph}%
+ {4}%
+ {0pt}%
+ {\@paragraphaboveskip}
+ {-1em}%
+ {\normalsize \bfseries \if \@times \itshape \fi}}
+
+\renewcommand{\subparagraph}{%
+ \@startsection%
+ {subparagraph}%
+ {4}%
+ {0pt}%
+ {\@paragraphaboveskip}
+ {-1em}%
+ {\normalsize \itshape}}
+
+% Standard headings:
+
+\newcommand{\acks}{\section*{Acknowledgments}}
+
+\newcommand{\keywords}{\paragraph*{Keywords}}
+
+\newcommand{\terms}{\paragraph*{General Terms}}
+
+% Identification
+% --------------
+
+
+\def \@conferencename {}
+\def \@conferenceinfo {}
+\def \@copyrightyear {}
+\def \@copyrightdata {[to be supplied]}
+\def \@proceedings {[Unknown Proceedings]}
+
+
+\newcommand{\conferenceinfo}[2]{%
+ \gdef \@conferencename {#1}%
+ \gdef \@conferenceinfo {#2}}
+
+\newcommand{\copyrightyear}[1]{%
+ \gdef \@copyrightyear {#1}}
+
+\let \CopyrightYear = \copyrightyear
+
+\newcommand{\copyrightdata}[1]{%
+ \gdef \@copyrightdata {#1}}
+
+\let \crdata = \copyrightdata
+
+\newcommand{\proceedings}[1]{%
+ \gdef \@proceedings {#1}}
+
+% Lists
+% -----
+
+
+\setlength{\leftmargini}{13pt}
+\setlength\leftmarginii{13pt}
+\setlength\leftmarginiii{13pt}
+\setlength\leftmarginiv{13pt}
+\setlength{\labelsep}{3.5pt}
+
+\setlength{\topsep}{\standardvspace}
+\if \@blockstyle
+ \setlength{\itemsep}{1pt}
+ \setlength{\parsep}{3pt}
+\else
+ \setlength{\itemsep}{1pt}
+ \setlength{\parsep}{3pt}
+\fi
+
+\renewcommand{\labelitemi}{{\small \centeroncapheight{\textbullet}}}
+\renewcommand{\labelitemii}{\centeroncapheight{\rule{2.5pt}{2.5pt}}}
+\renewcommand{\labelitemiii}{$-$}
+\renewcommand{\labelitemiv}{{\Large \textperiodcentered}}
+
+\renewcommand{\@listi}{%
+ \leftmargin = \leftmargini
+ \listparindent = 0pt}
+%%% \itemsep = 1pt
+%%% \parsep = 3pt}
+%%% \listparindent = \parindent}
+
+\let \@listI = \@listi
+
+\renewcommand{\@listii}{%
+ \leftmargin = \leftmarginii
+ \topsep = 1pt
+ \labelwidth = \leftmarginii
+ \advance \labelwidth by -\labelsep
+ \listparindent = \parindent}
+
+\renewcommand{\@listiii}{%
+ \leftmargin = \leftmarginiii
+ \labelwidth = \leftmarginiii
+ \advance \labelwidth by -\labelsep
+ \listparindent = \parindent}
+
+\renewcommand{\@listiv}{%
+ \leftmargin = \leftmarginiv
+ \labelwidth = \leftmarginiv
+ \advance \labelwidth by -\labelsep
+ \listparindent = \parindent}
+
+% Mathematics
+% -----------
+
+
+\def \theequation {\arabic{equation}}
+
+% Miscellaneous
+% -------------
+
+
+\newcommand{\balancecolumns}{%
+ \vfill\eject
+ \global\@colht = \textheight
+ \global\ht\@cclv = \textheight}
+
+\newcommand{\nut}{\hspace{.5em}}
+
+\newcommand{\softraggedright}{%
+ \let \\ = \@centercr
+ \leftskip = 0pt
+ \rightskip = 0pt plus 10pt}
+
+% Program Code
+% ------- ----
+
+
+\newcommand{\mono}[1]{%
+ {\@tempdima = \fontdimen2\font
+ \texttt{\spaceskip = 1.1\@tempdima #1}}}
+
+% Running Heads and Feet
+% ------- ----- --- ----
+
+
+\def \@preprintfooter {}
+
+\newcommand{\preprintfooter}[1]{%
+ \gdef \@preprintfooter {#1}}
+
+\if \@preprint
+
+\def \ps at plain {%
+ \let \@mkboth = \@gobbletwo
+ \let \@evenhead = \@empty
+ \def \@evenfoot {\scriptsize \textit{\@preprintfooter}\hfil \thepage \hfil
+ \textit{\@formatyear}}%
+ \let \@oddhead = \@empty
+ \let \@oddfoot = \@evenfoot}
+
+\else\if \@reprint
+
+\def \ps at plain {%
+ \let \@mkboth = \@gobbletwo
+ \let \@evenhead = \@empty
+ \def \@evenfoot {\scriptsize \hfil \thepage \hfil}%
+ \let \@oddhead = \@empty
+ \let \@oddfoot = \@evenfoot}
+
+\else
+
+\let \ps at plain = \ps at empty
+\let \ps at headings = \ps at empty
+\let \ps at myheadings = \ps at empty
+
+\fi\fi
+
+\def \@formatyear {%
+ \number\year/\number\month/\number\day}
+
+% Special Characters
+% ------- ----------
+
+
+\DeclareRobustCommand{\euro}{%
+ \protect{\rlap{=}}{\sf \kern .1em C}}
+
+% Title Page
+% ----- ----
+
+
+\@setflag \@addauthorsdone = \@false
+
+\def \@titletext {\@latex at error{No title was provided}{}}
+\def \@subtitletext {}
+
+\newcount{\@authorcount}
+
+\newcount{\@titlenotecount}
+\newtoks{\@titlenotetext}
+
+\def \@titlebanner {}
+
+\renewcommand{\title}[1]{%
+ \gdef \@titletext {#1}}
+
+\newcommand{\subtitle}[1]{%
+ \gdef \@subtitletext {#1}}
+
+\newcommand{\authorinfo}[3]{% {names}{affiliation}{email/URL}
+ \global\@increment \@authorcount
+ \@withname\gdef {\@authorname\romannumeral\@authorcount}{#1}%
+ \@withname\gdef {\@authoraffil\romannumeral\@authorcount}{#2}%
+ \@withname\gdef {\@authoremail\romannumeral\@authorcount}{#3}}
+
+\renewcommand{\author}[1]{%
+ \@latex at error{The \string\author\space command is obsolete;
+ use \string\authorinfo}{}}
+
+\newcommand{\titlebanner}[1]{%
+ \gdef \@titlebanner {#1}}
+
+\renewcommand{\maketitle}{%
+ \pagestyle{plain}%
+ \if \@onecolumn
+ {\hsize = \standardtextwidth
+ \@maketitle}%
+ \else
+ \twocolumn[\@maketitle]%
+ \fi
+ \@placetitlenotes
+ \if \@copyrightwanted \@copyrightspace \fi}
+
+\def \@maketitle {%
+ \begin{center}
+ \@settitlebanner
+ \let \thanks = \titlenote
+ {\leftskip = 0pt plus 0.25\linewidth
+ \rightskip = 0pt plus 0.25 \linewidth
+ \parfillskip = 0pt
+ \spaceskip = .7em
+ \noindent \LARGE \bfseries \@titletext \par}
+ \vskip 6pt
+ \noindent \Large \@subtitletext \par
+ \vskip 12pt
+ \ifcase \@authorcount
+ \@latex at error{No authors were specified for this paper}{}\or
+ \@titleauthors{i}{}{}\or
+ \@titleauthors{i}{ii}{}\or
+ \@titleauthors{i}{ii}{iii}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{viii}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{viii}{ix}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{viii}{ix}\@titleauthors{x}{}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{viii}{ix}\@titleauthors{x}{xi}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{viii}{ix}\@titleauthors{x}{xi}{xii}%
+ \else
+ \@latex at error{Cannot handle more than 12 authors}{}%
+ \fi
+ \vspace{1.75pc}
+ \end{center}}
+
+\def \@settitlebanner {%
+ \if \@andp{\@preprint}{\@notp{\@emptydefp{\@titlebanner}}}%
+ \vbox to 0pt{%
+ \vskip -32pt
+ \noindent \textbf{\@titlebanner}\par
+ \vss}%
+ \nointerlineskip
+ \fi}
+
+\def \@titleauthors #1#2#3{%
+ \if \@andp{\@emptyargp{#2}}{\@emptyargp{#3}}%
+ \noindent \@setauthor{40pc}{#1}{\@false}\par
+ \else\if \@emptyargp{#3}%
+ \noindent \@setauthor{17pc}{#1}{\@false}\hspace{3pc}%
+ \@setauthor{17pc}{#2}{\@false}\par
+ \else
+ \noindent \@setauthor{12.5pc}{#1}{\@false}\hspace{2pc}%
+ \@setauthor{12.5pc}{#2}{\@false}\hspace{2pc}%
+ \@setauthor{12.5pc}{#3}{\@true}\par
+ \relax
+ \fi\fi
+ \vspace{20pt}}
+
+\def \@setauthor #1#2#3{% {width}{text}{unused}
+ \vtop{%
+ \def \and {%
+ \hspace{16pt}}
+ \hsize = #1
+ \normalfont
+ \centering
+ \large \@name{\@authorname#2}\par
+ \vspace{5pt}
+ \normalsize \@name{\@authoraffil#2}\par
+ \vspace{2pt}
+ \textsf{\@name{\@authoremail#2}}\par}}
+
+\def \@maybetitlenote #1{%
+ \if \@andp{#1}{\@gtrp{\@authorcount}{3}}%
+ \titlenote{See page~\pageref{@addauthors} for additional authors.}%
+ \fi}
+
+\newtoks{\@fnmark}
+
+\newcommand{\titlenote}[1]{%
+ \global\@increment \@titlenotecount
+ \ifcase \@titlenotecount \relax \or
+ \@fnmark = {\ast}\or
+ \@fnmark = {\dagger}\or
+ \@fnmark = {\ddagger}\or
+ \@fnmark = {\S}\or
+ \@fnmark = {\P}\or
+ \@fnmark = {\ast\ast}%
+ \fi
+ \,$^{\the\@fnmark}$%
+ \edef \reserved at a {\noexpand\@appendtotext{%
+ \noexpand\@titlefootnote{\the\@fnmark}}}%
+ \reserved at a{#1}}
+
+\def \@appendtotext #1#2{%
+ \global\@titlenotetext = \expandafter{\the\@titlenotetext #1{#2}}}
+
+\newcount{\@authori}
+
+\iffalse
+\def \additionalauthors {%
+ \if \@gtrp{\@authorcount}{3}%
+ \section{Additional Authors}%
+ \label{@addauthors}%
+ \noindent
+ \@authori = 4
+ {\let \\ = ,%
+ \loop
+ \textbf{\@name{\@authorname\romannumeral\@authori}},
+ \@name{\@authoraffil\romannumeral\@authori},
+ email: \@name{\@authoremail\romannumeral\@authori}.%
+ \@increment \@authori
+ \if \@notp{\@gtrp{\@authori}{\@authorcount}} \repeat}%
+ \par
+ \fi
+ \global\@setflag \@addauthorsdone = \@true}
+\fi
+
+\let \addauthorsection = \additionalauthors
+
+\def \@placetitlenotes {
+ \the\@titlenotetext}
+
+% Utilities
+% ---------
+
+
+\newcommand{\centeroncapheight}[1]{%
+ {\setbox\@tempboxa = \hbox{#1}%
+ \@measurecapheight{\@tempdima}% % Calculate ht(CAP) - ht(text)
+ \advance \@tempdima by -\ht\@tempboxa % ------------------
+ \divide \@tempdima by 2 % 2
+ \raise \@tempdima \box\@tempboxa}}
+
+\newbox{\@measbox}
+
+\def \@measurecapheight #1{% {\dimen}
+ \setbox\@measbox = \hbox{ABCDEFGHIJKLMNOPQRSTUVWXYZ}%
+ #1 = \ht\@measbox}
+
+\long\def \@titlefootnote #1#2{%
+ \insert\footins{%
+ \reset at font\footnotesize
+ \interlinepenalty\interfootnotelinepenalty
+ \splittopskip\footnotesep
+ \splitmaxdepth \dp\strutbox \floatingpenalty \@MM
+ \hsize\columnwidth \@parboxrestore
+%%% \protected at edef\@currentlabel{%
+%%% \csname p at footnote\endcsname\@thefnmark}%
+ \color at begingroup
+ \def \@makefnmark {$^{#1}$}%
+ \@makefntext{%
+ \rule\z@\footnotesep\ignorespaces#2\@finalstrut\strutbox}%
+ \color at endgroup}}
+
+% LaTeX Modifications
+% ----- -------------
+
+\def \@seccntformat #1{%
+ \@name{\the#1}%
+ \@expandaftertwice\@seccntformata \csname the#1\endcsname.\@mark
+ \quad}
+
+\def \@seccntformata #1.#2\@mark{%
+ \if \@emptyargp{#2}.\fi}
+
+% Revision History
+% -------- -------
+
+
+% Date Person Ver. Change
+% ---- ------ ---- ------
+
+% 2004.09.12 PCA 0.1--5 Preliminary development.
+
+% 2004.11.18 PCA 0.5 Start beta testing.
+
+% 2004.11.19 PCA 0.6 Obsolete \author and replace with
+% \authorinfo.
+% Add 'nocopyrightspace' option.
+% Compress article opener spacing.
+% Add 'mathtime' option.
+% Increase text height by 6 points.
+
+% 2004.11.28 PCA 0.7 Add 'cm/computermodern' options.
+% Change default to Times text.
+
+% 2004.12.14 PCA 0.8 Remove use of mathptm.sty; it cannot
+% coexist with latexsym or amssymb.
+
+% 2005.01.20 PCA 0.9 Rename class file to sigplanconf.cls.
+
+% 2005.03.05 PCA 0.91 Change default copyright data.
+
+% 2005.03.06 PCA 0.92 Add at-signs to some macro names.
+
+% 2005.03.07 PCA 0.93 The 'onecolumn' option defaults to '11pt',
+% and it uses the full type width.
+
+% 2005.03.15 PCA 0.94 Add at-signs to more macro names.
+% Allow margin paragraphs during review.
+
+% 2005.03.22 PCA 0.95 Implement \euro.
+% Remove proof and newdef environments.
+
+% 2005.05.06 PCA 1.0 Eliminate 'onecolumn' option.
+% Change footer to small italic and eliminate
+% left portion if no \preprintfooter.
+% Eliminate copyright notice if preprint.
+% Clean up and shrink copyright box.
+
+% 2005.05.30 PCA 1.1 Add alternate permission statements.
+
+% 2005.06.29 PCA 1.1 Publish final first edition of guide.
+
+% 2005.07.14 PCA 1.2 Add \subparagraph.
+% Use block paragraphs in lists, and adjust
+% spacing between items and paragraphs.
+
+% 2006.06.22 PCA 1.3 Add 'reprint' option and associated
+% commands.
+
+% 2006.08.24 PCA 1.4 Fix bug in \maketitle case command.
+
+% 2007.03.13 PCA 1.5 The title banner only displays with the
+% 'preprint' option.
+
+% 2007.06.06 PCA 1.6 Use \bibfont in \thebibliography.
+% Add 'natbib' option to load and configure
+% the natbib package.
+
+% 2007.11.20 PCA 1.7 Balance line lengths in centered article
+% title (thanks to Norman Ramsey).
+
+% 2009.01.26 PCA 1.8 Change natbib \bibpunct values.
+
+% 2009.03.24 PCA 1.9 Change natbib to use the 'numbers' option.
+% Change templates to use 'natbib' option.
+
+% 2009.09.01 PCA 2.0 Add \reprintprice command (suggested by
+% Stephen Chong).
+
+% 2009.09.08 PCA 2.1 Make 'natbib' the default; add 'nonatbib'.
+% SB Add 'authoryear' and 'numbers' (default) to
+% control citation style when using natbib.
+% Add \bibpunct to change punctuation for
+% 'authoryear' style.
+
+% 2009.09.21 PCA 2.2 Add \softraggedright to the thebibliography
+% environment. Also add to template so it will
+% happen with natbib.
+
+% 2009.09.30 PCA 2.3 Remove \softraggedright from thebibliography.
+% Just include in the template.
+
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