From: "David Baelde" <david.baelde@gmail.com>
To: "Jacques Garrigue" <garrigue@math.nagoya-u.ac.jp>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Re: Optimizing Array.blit
Date: Tue, 10 Apr 2007 12:08:54 +0200 [thread overview]
Message-ID: <53c655920704100308s567a86f0rf189a8ee4a0a3a61@mail.gmail.com> (raw)
In-Reply-To: <20070410.102630.63130168.garrigue@math.nagoya-u.ac.jp>
Hi,
Thanks a lot for that advice, I was stupid not to try that before. I
got a 4 fold improvement too on my PIV desktop machine, which brings
the specialized ML code about as fast as the C code. This does not
change when I pass -O3 to gcc.
However, I ran the test on a dedibox, which has a VIA processor. The
machine is loaded so it's difficult to conclude anything, but I get
quite always the same surprising figures: without -O3 I get 0.57 for
the C code, 0.91 for the generic ML and 0.25 for the specialized ML;
with -O3 I get 0.12 for the C code, same for the others.
Optimizing is boring...
--
David
prev parent reply other threads:[~2007-04-10 10:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-04 22:19 David Baelde
2007-04-05 17:56 ` [Caml-list] " Tom
2007-04-05 21:54 ` Florian Weimer
2007-04-06 7:00 ` David Baelde
2007-04-10 0:13 ` David Baelde
2007-04-10 1:26 ` [Caml-list] " Jacques Garrigue
2007-04-10 10:08 ` David Baelde [this message]
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