Le Mon, 13 Nov 2006 21:30:35 +0100, Fredrik Lundh <[EMAIL PROTECTED]> a écrit :
> Jonathan Ballet wrote: > > >> http://effbot.org/pyfaq/why-doesnt-python-release-the-memory-when-i-delete-a-large-object > > > > Is it still true with Python 2.5 ? > > > > I mean, [http://evanjones.ca/python-memory.html] should fix this > > behaviour, doesn't it ? > > not really -- that change just means that Python's object allocator > will return memory chunks to the C allocator if the chunks become > empty, but as the FAQ entry says, there are no guarantees that > anything will be returned at all. it all depends on your > application's memory allocation patterns. Ah ok, I thought memory was much "directly freed" to system (but I misread the faq). Is there any documents on good application's memory allocation patterns ? > (did you read Evan's presentation material, btw?) I re-read it (thx for mentioning it), but schemas on pages 7, 8 and 9 are not very clear to me. (snip some questions, since I find answers will writing them). Where are stored pools which are not completely free ? (not in 'usedpools' nor in 'freepools' objects) (ah, this is the partially_allocated_arenas I guess :) ) Are 'usedpools' and 'freepools' arenas ? Smalls objects are stored in free blocks, so a block has a length of 256 bytes I guess. Can its size change (smaller, maybe larger) ? So, if I am correct : - I create a new 'small' object -> Python allocates a new arena, and stores my object in a free block in one of the pool of this arena - this arena is stored in the partially_allocated_arenas list (Python 2.5) - allocating more objects fills all the blocks of every pools of the arena -> all pools are going one by one into 'usedpools' object - del-eting every created object in my Python program free every blocks of every pools of the arena (with a lot of chance :) ), and pools are going into the 'freepools' object - if all pools from an arena are freed, the arena is freed - else, the arena stay allocated, in order to be re-used Thanks, Jonathan -- http://mail.python.org/mailman/listinfo/python-list
