[Python-Dev] The untuned tunable parameter ARENA_SIZE (original) (raw)

Larry Hastings larry at hastings.org
Thu Jun 1 04:41:15 EDT 2017

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.

* 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.

On Windows Python uses VirtualAlloc(), and I don't know what the implications are of that.

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