From: lists@sapience.com
To: linux-kernel@vger.kernel.org
Cc: Sebastian Heidl <heidl@zib.de>
Subject: Re: Intel compiler [Re: Using %cr2 to reference "current"]
Date: Wed, 7 Nov 2001 17:05:53 -0500 [thread overview]
Message-ID: <20011107170553.A21740@sapience.com> (raw)
In-Reply-To: <3BE94C55.AE42D67E@evision-ventures.com> <E161TWH-0004G9-00@the-village.bc.nu> <20011107153946.T552@csr-pc1.zib.de>
In-Reply-To: <20011107153946.T552@csr-pc1.zib.de>
Just as another data point - a simple test, I ran intel
compiler on flops v2.
Run 3 ways - gcc3, icc (v 5) and the beta 6 icc. All run
on dual p4 with 1 Gb mem on Rh 7.2
At least on this test the differences are quite dramatic.
Regards,
gene/
---------------------------------------------------------------------
Summary
------
gcc -DUNIX -O3 -march=i686 flops2.c
icc -xMKW -o flops2 -DUNIX -O3 flops2.c
FLOPS C Program (Double Precision), V2.0 18 Dec 1992
Module MFLOPS
gcc icc 5 icc 6
-------- --------- ----------
1 444.9410 439.4850 674.3180
2 265.4815 362.3862 362.3862
3 298.1843 604.0250 1270.6569
4 337.7309 1224.8804 1373.8819
5 392.7003 1138.6503 1131.7073
6 391.7678 1334.0521 1422.2222
7 163.5783 193.3900 193.5118
8 395.7743 1317.3242 1372.6542
Iterations = 512000000 512000000 512000000
NullTime (usec) = 0.0029 0.0000 0.0000
MFLOPS(1) = 275.3542 416.9120 472.8952
MFLOPS(2) = 264.7165 413.4297 448.2175
MFLOPS(3) = 339.5966 714.7146 834.5651
MFLOPS(4) = 362.1891 1071.8196 1367.5374
---------------------------------------------------------------------
On Wed, Nov 07, 2001 at 03:39:46PM +0100, Sebastian Heidl wrote:
> On Wed, Nov 07, 2001 at 02:17:33PM +0000, Alan Cox wrote:
> > > somehow encouraged by the compiler comparisions between gcc and intel's
> > > free compiler, which use the register passing for anything local
> > > to the actual code, where the speed gains are up to 20% im currently
> >
> > I was under the impression intels compiler was profoundly non-free ?
>
> have a look:
> http://developer.intel.com/software/products/eval/
next prev parent reply other threads:[~2001-11-07 22:06 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-06 7:18 Using %cr2 to reference "current" H. Peter Anvin
2001-11-06 8:01 ` Robert Love
2001-11-06 10:55 ` Alan Cox
2001-11-06 17:31 ` Michael Barabanov
2001-11-06 14:14 ` Manfred Spraul
2001-11-06 10:58 ` Alan Cox
2001-11-06 17:04 ` Linus Torvalds
2001-11-06 17:46 ` Alan Cox
2001-11-06 17:59 ` Linus Torvalds
2001-11-06 18:14 ` Alan Cox
2001-11-06 16:55 ` Marcelo Tosatti
2001-11-06 18:14 ` Linus Torvalds
2001-11-06 18:31 ` Alan Cox
2001-11-06 22:38 ` Linus Torvalds
2001-11-07 0:00 ` Martin Dalecki
2001-11-06 23:19 ` Alan Cox
2001-11-07 0:43 ` Martin Dalecki
2001-11-07 0:27 ` Alan Cox
2001-11-07 0:35 ` Jeff Garzik
2001-11-07 14:00 ` Martin Dalecki
2001-11-07 13:38 ` Alan Cox
2001-11-07 14:59 ` Martin Dalecki
2001-11-07 14:17 ` Alan Cox
2001-11-07 14:34 ` Dirk Moerenhout
2001-11-07 14:54 ` Alan Cox
2001-11-07 15:32 ` David Howells
2001-11-07 14:39 ` Intel compiler [Re: Using %cr2 to reference "current"] Sebastian Heidl
2001-11-07 22:05 ` lists [this message]
2001-11-07 15:36 ` Using %cr2 to reference "current" Martin Dalecki
2001-11-08 14:08 ` Martin Dalecki
2001-11-13 16:49 ` Merge BUG in 2.4.15-pre4 serial.c Martin Dalecki
2001-11-13 16:21 ` Russell King
2001-11-13 17:37 ` Martin Dalecki
2001-11-13 16:53 ` Russell King
2001-11-13 18:05 ` Martin Dalecki
2001-11-13 17:11 ` Alan Cox
2001-11-13 18:23 ` Martin Dalecki
2001-11-07 20:04 ` Using %cr2 to reference "current" Andrew Morton
2001-11-11 13:16 ` Martin Dalecki
2001-11-11 13:06 ` Keith Owens
2001-11-12 11:28 ` PATCH 2.4.14 mregparm=3 compilation fixes Martin Dalecki
2001-11-12 16:10 ` Keith Owens
2001-11-12 16:25 ` Christoph Hellwig
2001-11-12 17:56 ` Martin Dalecki
2001-11-12 16:42 ` Linus Torvalds
2001-11-12 18:51 ` Martin Dalecki
2001-11-12 20:05 ` Corsspatch patch-2.4.15-pre2 patch-2.4.15-pre3 Martin Dalecki
2001-11-12 20:13 ` BUG BUG hunt the bugs!!! patch-2.4.15-pre5 Martin Dalecki
2001-11-06 17:02 ` Using %cr2 to reference "current" Linus Torvalds
2001-11-06 17:13 ` Benjamin LaHaise
2001-11-06 17:49 ` Linus Torvalds
2001-11-06 18:19 ` Alan Cox
2001-11-09 21:52 ` Jamie Lokier
2001-11-06 18:42 ` Benjamin LaHaise
2001-11-06 19:09 ` H. Peter Anvin
2001-11-06 19:16 ` Dave Jones
2001-11-06 20:10 ` Ricky Beam
2001-11-06 23:09 ` Alan Cox
2001-11-06 23:15 ` Dave Jones
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20011107170553.A21740@sapience.com \
--to=lists@sapience.com \
--cc=heidl@zib.de \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.