[pypy-dev] Poor performance for Krakatau

[Robert Grosse]

In some cases, Pypy performs worse than CPython when running Krakatau, and
it has gotten a lot worse from 2.3 to 2.5

My benchmark is https://github.com/Storyyeller/Krakatau/tree/pypy_benchmark
(for future reference, commit d889c7f44723e6d66a3630681f0385f173317dc9)

You can run it with pypy Krakatau\benchmark.py -path <path to Java rt.jar>

I get the following timings

CPython: 17.43s
Pypy 2.3: 38.48s (build pypy-c-jit-71056-c8e3b8cbc843-win32)
Pypy 2.4: 39.92s (build pypy-c-jit-72200-375133966c12-win32)
Pypy 2.5: 49.94s (build pypy-c-jit-74404-9fd586fe0fe5-win32)

Not only was it slower than CPython to begin with, but it got much worse
recently.
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