[Python-Dev] Re: Python 2.1 slower than 2.0

[Jeremy Hylton]

I hope another set of benchmarks isn't overkill for the list.  I see
different results comparing 2.1 with 2.0 (both -O3) using pybench
0.6. 

The interesting differences I see in this benchmark that I didn't see
in MAL's are:

DictCreation +15.87%
SeoncdImport +20.29%

Other curious differences, which show up in both benchmarks, include:
SpecialClassAttribute +17.91%     (private variables)
SpecialInstanceAttribute +15.34%  (__methods__)

Jeremy

PYBENCH 0.6

Benchmark: py21 (rounds=10, warp=20)

Tests:                              per run    per oper.  diff *
------------------------------------------------------------------------
          BuiltinFunctionCalls:     305.05 ms    2.39 us   +4.77%
           BuiltinMethodLookup:     319.65 ms    0.61 us   +2.55%
                 ConcatStrings:     383.70 ms    2.56 us   +1.27%
               CreateInstances:     463.85 ms   11.04 us   +1.96%
       CreateStringsWithConcat:     381.20 ms    1.91 us   +2.39%
                  DictCreation:     508.85 ms    3.39 us  +15.87%
                      ForLoops:     577.60 ms   57.76 us   +5.65%
                    IfThenElse:     443.70 ms    0.66 us   +1.02%
                   ListSlicing:     207.50 ms   59.29 us   -4.18%
                NestedForLoops:     315.75 ms    0.90 us   +3.54%
          NormalClassAttribute:     379.80 ms    0.63 us   +7.39%
       NormalInstanceAttribute:     385.45 ms    0.64 us   +8.04%
           PythonFunctionCalls:     400.00 ms    2.42 us  +13.62%
             PythonMethodCalls:     306.25 ms    4.08 us   +5.13%
                     Recursion:     337.25 ms   26.98 us  +19.00%
                  SecondImport:     301.20 ms   12.05 us  +20.29%
           SecondPackageImport:     298.20 ms   11.93 us  +18.15%
         SecondSubmoduleImport:     339.15 ms   13.57 us  +11.40%
       SimpleComplexArithmetic:     392.70 ms    1.79 us  -10.52%
        SimpleDictManipulation:     350.40 ms    1.17 us   +3.87%
         SimpleFloatArithmetic:     300.75 ms    0.55 us   +2.04%
      SimpleIntFloatArithmetic:     347.95 ms    0.53 us   +9.01%
       SimpleIntegerArithmetic:     356.40 ms    0.54 us  +12.01%
        SimpleListManipulation:     351.85 ms    1.30 us  +11.33%
          SimpleLongArithmetic:     309.00 ms    1.87 us   -5.81%
                    SmallLists:     584.25 ms    2.29 us  +10.20%
                   SmallTuples:     442.00 ms    1.84 us  +10.33%
         SpecialClassAttribute:     406.50 ms    0.68 us  +17.91%
      SpecialInstanceAttribute:     557.40 ms    0.93 us  +15.34%
                 StringSlicing:     336.45 ms    1.92 us   +9.56%
                     TryExcept:     650.60 ms    0.43 us   +1.40%
                TryRaiseExcept:     345.95 ms   23.06 us   +2.70%
                  TupleSlicing:     266.35 ms    2.54 us   +4.70%
------------------------------------------------------------------------
            Average round time:   14413.00 ms              +7.07%

*) measured against: py20 (rounds=10, warp=20)