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
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