[pypy-issue] [issue1206] Extreme slowdown of code part (array.array) operations

[mikefc]

mikefc <coolbutuseless at gmail.com> added the comment:

If you change "del self.__arr[:self.expected]" to "self.__arr = self.__arr[self.expected:]" 
then the code is only a factor 20x slower (instead of 1715x)

After making the above change I got these times:

time ~/pypy-latest/bin/pypy pypy_bug.py 
process size 2511188 kb
real	0m17.942s
user	0m14.875s
sys	0m3.064s

time python pypy_bug.py 
process size 2441100 kb
real	0m1.019s
user	0m0.998s
sys	0m0.018s

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nosy: +mikefc
status: unread -> chatting

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PyPy bug tracker <tracker at bugs.pypy.org>
<https://bugs.pypy.org/issue1206>
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