[Python-Dev] The untuned tunable parameter ARENA_SIZE

Larry Hastings 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 
> 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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