[Python-Dev] The untuned tunable parameter ARENA_SIZE (original) (raw)
Larry Hastings larry at hastings.org
Thu Jun 1 04:45:56 EDT 2017
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On 06/01/2017 01:41 AM, Larry Hastings wrote:
On 06/01/2017 01:19 AM, Antoine Pitrou wrote:
malloc() you said? Arenas are allocated using mmap() nowadays, right? malloc() and free(). See PyObjectArenaMalloc (etc) in Objects/obmalloc.c.
Oh, sorry, I forgot how to read. If ARENAS_USE_MMAP is on it uses mmap(). I can't figure out when or how MAP_ANONYMOUS gets set, but if I step into the _PyObject_Arena.alloc() it indeed calls _PyObject_ArenaMmap() which uses mmap(). So, huzzah!, we use mmap() to allocate our enormous 256kb arenas.
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