From: Jan Kybic <kybic@fel.cvut.cz>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Q: Efficient operations on complex numbers
Date: 26 Jan 2004 10:00:26 +0100 [thread overview]
Message-ID: <m2hdyjozit.fsf@cmpgw-iii-23.felk.cvut.cz> (raw)
In-Reply-To: <20040124103604.A9502@pauillac.inria.fr>
Xavier Leroy:
> Yes, it does, if the .cmx files for the other compilation units are
> available. So, I'm a bit surprised about what Jan Kybic observed.
> What I would have expected is that referring to the Complex module or
> copying it inside the source file shouldn't change the generated
> code, at least if you stay at the default inlining level.
Thank you for your reply. Yes, you are right, if I inline at
sufficiently high level (say 'ocamplopt -inline 10), then using the
Complex module is as fast as copying the code.
As for the slowdown, it apparently depends on the compiler and/or
processor. On my system:
Intel(R) Pentium(R) M processor 1400MHz
Mandrake Linux release 9.1 (Bamboo) for i586
gcc version 3.2.2 (Mandrake Linux 9.1 3.2.2-3mdk)
The Objective Caml native-code compiler, version 3.07
I find that Ocaml program takes about 170~200% of the time of the C++
version, while on Christophe TROESTLER's machine (Intel(R) Pentium(R)
4 CPU 2.40GHz)), who kindly repeated my experiments, it was just
140%. So this is really a complex issue with many variables.
If I gain more insight into it, I will keep you posted.
Jan
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Jan Kybic <kybic@ieee.org> tel. +420 2 2435 7264
or <kybic@fel.cvut.cz>, http://cmp.felk.cvut.cz/~kybic
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prev parent reply other threads:[~2004-01-26 9:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-23 10:24 Jan Kybic
2004-01-24 0:31 ` Nuutti Kotivuori
2004-01-24 9:36 ` Xavier Leroy
2004-01-24 15:40 ` Nuutti Kotivuori
2004-01-26 9:00 ` Jan Kybic [this message]
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