Charles-Francois Natali <neolo...@free.fr> added the comment: > The MALLOC_MMAP_THRESHOLD improvement is less visible here: >
Are you running on 64-bit ? If yes, it could be that you're exhausting M_MMAP_MAX (malloc falls back to brk when there are too many mmap mappings). You could try with MALLOC_MMAP_THRESHOLD_=1024 MALLOC_MMAP_MAX_=16777216 ../opt/python issue11849_test.py By the way, never do that in real life, it's a CPU and memory hog ;-) I think the root cause is that glibc's malloc coalescing of free chunks is called far less often than in the original ptmalloc version, but I still have to dig some more. >> By the way, I noticed that dictionnaries are never allocated through >> pymalloc, since a new dictionnary takes more than 256B... > > On 64-bit builds indeed. pymalloc could be improved to handle allocations up > to 512B. Want to try and write a patch? Sure. I'll open another issue. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue11849> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
