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I've just seen your talk at FOSDEM and you mentioned cStringIO wasn't that fast. I just recenlty did some performance testing with it and my conclusion was that it's only fast when it has to handle a lot of data/iterations. My guess is that it's due to many memory reallocations that the string_concat has to do. On my machine the "boundary" is about 200k iterations. I've made the example 1M iterations so that the speedup shows its' advantage Timing function string_concat_more(): 10 loops, best of 3: 1.94 sec per loop Timing function string_cstringio_more(): 10 loops, best of 3: 382 msec per loop
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I've just seen your talk at FOSDEM and you mentioned cStringIO wasn't that fast. I just recenlty did some performance testing with it and my conclusion was that it's only fast when it has to handle a lot of data/iterations. My guess is that it's due to many memory reallocations that the string_concat has to do.
On my machine the "boundary" is about 200k iterations. I've made the example 1M iterations so that the speedup shows its' advantage
Timing function string_concat_more():
10 loops, best of 3: 1.94 sec per loop
Timing function string_cstringio_more():
10 loops, best of 3: 382 msec per loop