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Optimizing garbage collection
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Date: 2010-11-21 (19:26)
From: Eray Ozkural <examachine@g...>
Subject: Re: [Caml-list] Optimizing garbage collection
Hello there Alexandre,

On Sun, Nov 21, 2010 at 8:13 PM, Alexandre Pilkiewicz <
alexandre.pilkiewicz@polytechnique.org> wrote:

> Hi
> 2010/11/20 Eray Ozkural <examachine@gmail.com>:
> > Yes, the default minor heap size was indeed too low, I've been trying to
> set
> > it to a higher value, now testing with the OCAMLRUNPARAM settings you
> > recommended. It did result in some speedup, but not an awful lot, it's
> > important to profile it as you say.
> Can you tell us how high you set it? I would recommend at least
> 524288, and even something like 3000000 if you really need to (I'm
> talking in words here)

I've set it to 4M and I think it's worked wonders, the collection time is no
more so significant in gprof output (surprisingly) at least now I can
identify the real bottlenecks! Indeed the 5-instr long fast path is quite
fast. Due to the peculiarities of my code, it didn't result in much speedup
but I've solved this problem, I can't believe I've overlooked the Gc
parameters, I should probably be setting them from within the code. A bit
embarrassed about it actually :)

I've been thinking whether some kind of doubling strategy would work for the
minor heap size. What do you think?


Eray Ozkural, PhD candidate.  Comp. Sci. Dept., Bilkent University, Ankara
http://myspace.com/arizanesil http://myspace.com/malfunct