Antoine Pitrou <pit...@free.fr> 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:
-> before patch: 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" "s=io.BytesIO(); w=s.write" "for x in d: w(x)" "s.g etvalue()" 10 loops, best of 3: 49.2 msec per loop -> after patch: 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" "s=io.BytesIO(); w=s.write" "for x in d: w(x)" "s.g etvalue()" 10 loops, best of 3: 41.7 msec per loop 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 ... which points to a much less optimized realloc() under Windows. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue15381> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
