[pypy-issue] [issue968] very slow ctypes callbacks

[Arman Bostani]

New submission from Arman Bostani <arman at twinsun.com>:

I've attached a simple Windows test case. Under pypy 1.7, this runs about 8 times 
slower than CPython 2.7.2.

----------
files: testcb.py
messages: 3586
nosy: arman0, pypy-issue
priority: performance bug
release: 1.7
status: unread
title: very slow ctypes callbacks

________________________________________
PyPy bug tracker <tracker at bugs.pypy.org>
<https://bugs.pypy.org/issue968>
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from ctypes import *
import timeit

def py_cmp_func(a, b):
    return a[0] - b[0]

CMPFUNC   = CFUNCTYPE(c_int, POINTER(c_int), POINTER(c_int))
cmp_func  = CMPFUNC(py_cmp_func)
int_size  = sizeof(c_int)
LEN       = 5
IntArray5 = c_int * LEN
ia        = IntArray5(5, 1, 7, 33, 99)
qsort     = cdll.msvcrt.qsort

def f():
    qsort(ia, LEN, int_size, cmp_func)

print timeit.repeat("f()", "from __main__ import f", number=100000)