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

Larry Hastings larry at hastings.org
Mon Jun 5 18:55:40 EDT 2017

On 06/04/2017 01:18 PM, Tim Peters wrote:

[Larry Hastings <larry at hastings.org>]

... Yet CPython's memory consumption continues to grow. By the time a current "trunk" build of CPython reaches the REPL prompt it's already allocated 16 arenas. I'd be surprised if that's true ;-) The first time newarena() is called, it allocates space for a vector of 16 (INITIALARENAOBJECTS) arenaobject structs. Those are tiny, and hold bookkeeping info for the actual arenas, none of which are allocated at first.

Oh! I thought it also allocated the arenas themselves, in a loop. I thought I saw that somewhere. Happy to be proved wrong...

So at most 9 arenas ("highwater mark") were ever simultaneously allocated..

... though not completely off-base.

On 06/04/2017 11:50 AM, Tim Peters wrote:

I was hoping to spur a discussion of much higher level issues. I bet Larry was too ;-)

Actually I was hoping everyone would just tell me how right I was and thank me for my profound insights.

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