[Tim Peters]
>> grow the list to its final size once, at the start (overestimating if
>> you don't know for sure). Then instead of appending, keep an index to
>> the next free slot, same as you'd do in C. Then the list guts never
>> move, so if that doesn't yield the same kind of speedup without
On Feb 18, 2005, at 17:51, Tim Peters wrote:
grow the list to its final size once, at the start (overestimating if
you don't know for sure). Then instead of appending, keep an index to
the next free slot, same as you'd do in C. Then the list guts never
move, so if that doesn't yield the same kind
[Tim Peters]
...
>> Then you allocate a small object, marked 's':
>>
>> bbbsfff
[Evan Jones]
> Isn't the whole point of obmalloc
No, because it doesn't matter what follows that introduction:
obmalloc has several points, including exploiting the GIL, heuris
On Thu, 2005-02-17 at 22:38, Tim Peters wrote:
Then you allocate a small object, marked 's':
bbbsfff
Isn't the whole point of obmalloc is that we don't want to allocate "s"
on the heap, since it is small? I guess "s" could be an object that
might potentiall
[Gfeller Martin]
> what immediately comes to mind are Modules/cPickle.c and
> Modules/cStringIO.c, which (I believe) are heavily used by ZODB (which in turn
> is heavily used by the application).
I probably guessed right the first time : LFH doesn't help with
the lists directly, but helps indirec
Evan Jones [mailto:[EMAIL PROTECTED]
Sent: Thursday, 17 Feb 2005 02:26
To: Python Dev
Cc: Gfeller Martin; Martin v. Löwis
Subject: Re: [Python-Dev] Windows Low Fragementation Heap yields speedup of ~15%
On Feb 16, 2005, at 18:42, Martin v. Löwis wrote:
> I must admit that I'm surpr
On Feb 16, 2005, at 18:42, Martin v. Löwis wrote:
I must admit that I'm surprised. I would have expected
that most allocations in Python go through obmalloc, so
the heap would only see "large" allocations.
It would be interesting to find out, in your application,
why it is still an improvement to u
Gfeller Martin wrote:
Nevertheless, I tried to convert the heap used by Python
to a Windows Low Fragmentation Heap (available on XP
and 2003 Server). This improved the overall run time
of a typical CPU-intensive report by about 15%
(overall run time is in the 5 minutes range), with the
same mem
