[Python-Dev] [ANN] VPython 0.1

[J. Sievers]

Hi,

I implemented a variant of the CPython VM on top of Gforth's Vmgen; this made
it fairly straightforward to add direct threaded code and superinstructions for
the various permutations of LOAD_CONST, LOAD_FAST, and most of the two-argument
VM instructions.

Sources:
  http://svirfneblin.org/stuff/VPython-0.1.tar.gz

Pybench output:

Test                             minimum run-time        average  run-time
                                 this    other   diff    this    other   diff
-------------------------------------------------------------------------------
          BuiltinFunctionCalls:   104ms   126ms  -17.3%   110ms   128ms  -14.0%
           BuiltinMethodLookup:    98ms   136ms  -27.9%   100ms   139ms  -28.1%
                 CompareFloats:    59ms   121ms  -51.1%    60ms   123ms  -50.7%
         CompareFloatsIntegers:    67ms   121ms  -45.0%    73ms   136ms  -46.7%
               CompareIntegers:    57ms   157ms  -63.7%    58ms   161ms  -64.1%
        CompareInternedStrings:    55ms   143ms  -61.6%    57ms   161ms  -64.5%
                  CompareLongs:    56ms   122ms  -54.0%    61ms   141ms  -56.7%
                CompareStrings:    71ms   126ms  -43.6%    72ms   131ms  -44.7%
                CompareUnicode:    82ms   123ms  -33.5%    83ms   131ms  -36.7%
                 ConcatStrings:   119ms   146ms  -18.4%   129ms   158ms  -18.4%
                 ConcatUnicode:    90ms   109ms  -17.2%    97ms   121ms  -19.8%
               CreateInstances:   116ms   124ms   -6.6%   118ms   127ms   -7.0%
            CreateNewInstances:   109ms   119ms   -7.9%   113ms   121ms   -6.6%
       CreateStringsWithConcat:    97ms   162ms  -40.3%    99ms   169ms  -41.5%
       CreateUnicodeWithConcat:    90ms   116ms  -22.8%    97ms   122ms  -20.8%
                  DictCreation:    87ms   122ms  -28.6%    91ms   127ms  -28.0%
             DictWithFloatKeys:    98ms   139ms  -29.5%   105ms   148ms  -29.3%
           DictWithIntegerKeys:    71ms   133ms  -46.7%    74ms   136ms  -46.0%
            DictWithStringKeys:    62ms   126ms  -51.0%    64ms   128ms  -50.3%
                      ForLoops:    68ms   135ms  -49.2%    69ms   136ms  -49.2%
                    IfThenElse:    63ms   130ms  -51.6%    64ms   134ms  -51.9%
                   ListSlicing:   122ms   123ms   -0.9%   126ms   125ms   +0.8%
                NestedForLoops:    89ms   149ms  -40.2%    93ms   152ms  -38.9%
          NormalClassAttribute:    88ms   132ms  -33.1%    95ms   134ms  -29.5%
       NormalInstanceAttribute:    72ms   116ms  -37.9%    77ms   118ms  -34.8%
           PythonFunctionCalls:    90ms   122ms  -26.1%    94ms   125ms  -24.7%
             PythonMethodCalls:   117ms   144ms  -18.8%   121ms   147ms  -17.8%
                     Recursion:   121ms   180ms  -32.6%   124ms   184ms  -32.4%
                  SecondImport:   144ms   139ms   +3.5%   150ms   143ms   +4.8%
           SecondPackageImport:   151ms   145ms   +3.9%   156ms   149ms   +4.3%
         SecondSubmoduleImport:   178ms   168ms   +5.8%   186ms   176ms   +5.4%
       SimpleComplexArithmetic:    71ms   112ms  -36.7%    76ms   123ms  -38.3%
        SimpleDictManipulation:    77ms   139ms  -44.3%    78ms   140ms  -44.3%
         SimpleFloatArithmetic:    61ms   124ms  -50.7%    63ms   126ms  -50.2%
      SimpleIntFloatArithmetic:    61ms   121ms  -49.4%    62ms   123ms  -49.5%
       SimpleIntegerArithmetic:    61ms   121ms  -49.5%    62ms   123ms  -49.8%
        SimpleListManipulation:    58ms   116ms  -50.0%    58ms   117ms  -50.2%
          SimpleLongArithmetic:    89ms   121ms  -26.3%    91ms   124ms  -27.0%
                    SmallLists:    79ms   116ms  -31.8%    82ms   122ms  -32.6%
                   SmallTuples:    91ms   117ms  -22.6%    93ms   122ms  -23.6%
         SpecialClassAttribute:    84ms   132ms  -36.4%    93ms   134ms  -30.4%
      SpecialInstanceAttribute:   111ms   153ms  -27.6%   114ms   155ms  -26.2%
                StringMappings:   102ms   115ms  -11.1%   104ms   117ms  -10.9%
              StringPredicates:   100ms   136ms  -26.7%   101ms   137ms  -26.1%
                 StringSlicing:    79ms   114ms  -30.2%    84ms   119ms  -29.9%
                     TryExcept:    68ms   145ms  -53.2%    69ms   148ms  -53.6%
                TryRaiseExcept:   106ms   104ms   +2.7%   109ms   106ms   +2.8%
                  TupleSlicing:   108ms   126ms  -14.4%   113ms   130ms  -13.0%
               UnicodeMappings:   150ms   150ms   -0.4%   152ms   154ms   -1.7%
             UnicodePredicates:   106ms   130ms  -18.3%   108ms   133ms  -18.3%
             UnicodeProperties:    94ms   111ms  -15.2%    97ms   115ms  -15.5%
                UnicodeSlicing:   101ms   130ms  -22.5%   105ms   136ms  -22.6%
-------------------------------------------------------------------------------
Totals:                          4750ms  6788ms  -30.0%  4929ms  7035ms  -29.9%

``other'' is vanilla Python 2.5.2.
For details, see README, TODO, and PYBENCH which come with the sources.
Feedback is, of course, very welcome and it'd be great to have some pybench
results from different machines.

Cheers,
-jakob