[Python-Dev] The untuned tunable parameter ARENA_SIZE
larry at hastings.org
Thu Jun 1 04:45:56 EDT 2017
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 _PyObject_ArenaMalloc (etc) in
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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