[issue15381] Optimize BytesIO to so less reallocations when written, similarly to StringIO
Serhiy Storchaka
report at bugs.python.org
Fri Jul 20 22:48:26 CEST 2012
Serhiy Storchaka <storchaka at gmail.com> added the comment:
> Under Windows (64-bit Windows 7 on a VirtualBox VM), the patch increases performance slightly but not as much as under Linux:
Thank you, Antoine. This is an expected result.
> And the join() approach is 10x faster (!):
> C:\t\cpython>pc\VS9.0\amd64\python.exe -m timeit -s "import io; n=2000; d=[b'a'*
> n,b'bb'*n,b'ccc'*n]*1000" "b''.join(d)"
> 100 loops, best of 3: 4.63 msec per loop
To be fair, test body should be: "s=[]; w=s.append" "for x in d: w(x)" "b''.join(s)"
May be tuning resize strategy (overallocate not 1/8, but 1/4, 1/2, or 100%) can help.
----------
_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15381>
_______________________________________
More information about the Python-bugs-list
mailing list