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[Python-Dev] The untuned tunable parameter ARENA_SIZE

Thomas Wouters thomas at python.org
Thu Jun 1 05:25:42 EDT 2017 
On Thu, Jun 1, 2017 at 10:45 AM, Larry Hastings <larry at hastings.org> wrote:

> 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,
>

MAP_ANONYMOUS is set by sys/mman.h (where the system supports it), just
like the other MAP_* defines.


> 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.
>
>
> */arry*
>
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Thomas Wouters <thomas at python.org>

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