[Python-checkins] r70658 - python/branches/py3k/Doc/whatsnew/3.1.rst

[antoine.pitrou]

Author: antoine.pitrou
Date: Sat Mar 28 20:45:26 2009
New Revision: 70658

Log:
Publicize 3.1-specific performance enhancements



Modified:
   python/branches/py3k/Doc/whatsnew/3.1.rst

Modified: python/branches/py3k/Doc/whatsnew/3.1.rst
==============================================================================
--- python/branches/py3k/Doc/whatsnew/3.1.rst	(original)
+++ python/branches/py3k/Doc/whatsnew/3.1.rst	Sat Mar 28 20:45:26 2009
@@ -112,3 +112,27 @@
 
 
 .. ======================================================================
+
+
+Optimizations
+-------------
+
+Major performance enhancements have been added:
+
+* The new I/O library (as defined in :pep:`3116`) was mostly written in
+  Python and quickly proved to be a problematic bottleneck in Python 3.0.
+  In Python 3.1, the I/O library has been entirely rewritten in C and is
+  2 to 20 times faster depending on the task at hand. The pure Python
+  version is still available for experimentation purposes through
+  the ``_pyio`` module.
+
+  (Contributed by Amaury Forgeot d'Arc and Antoine Pitrou.)
+
+* A new configure flag, ``--with-computed-gotos``, enables a faster opcode
+  dispatch mechanism on compilers which support it. Speedups of up to 20%
+  have been observed, depending on the system and compiler.
+
+  (Contributed by Antoine Pitrou, :issue:`4753`.)
+
+
+.. ======================================================================