On Thu, 1 Jun 2017 01:41:15 -0700 Larry Hastings <la...@hastings.org> wrote: > On 06/01/2017 01:19 AM, Antoine Pitrou wrote: > > If you'd like to go that way anyway, I would suggest 1MB as a starting > > point in 3.7. > > I understand the desire for caution. But I was hoping maybe we could > experiment with 4mb in trunk for a while? We could change it to 1mb--or > even 256k--before beta 1 if we get anxious.
Almost nobody tests "trunk" (or "master" :-)) on production systems. At best a couple rare open source projects will run their test suite on the pre-release betas, but that's all. So we are unlikely to spot memory usage ballooning problems before the final release. > >> * Many programs would be slightly faster now and then, simply because > >> we call malloc() 1/16 as often. > > malloc() you said? Arenas are allocated using mmap() nowadays, right? > > malloc() and free(). See _PyObject_ArenaMalloc (etc) in Objects/obmalloc.c. _PyObject_ArenaMalloc should only be used if the OS doesn't support mmap() or MAP_ANONYMOUS (see ARENAS_USE_MMAP). Otherwise _PyObject_ArenaMmap is used. Apparently OS X doesn't have MAP_ANONYMOUS but it has the synonymous MAP_ANON: https://github.com/HaxeFoundation/hashlink/pull/12 Regards Antoine. _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
