Messages in this thread | | | From | "Ingo at Pyrillion" <> | Subject | AW: Kernel 2.6.3 patch for Intel Compiler 8.0 | Date | Wed, 10 Mar 2004 01:58:51 +0100 |
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Hi again,
please read my last mail carefully: "33% procs faster on icc, 66% faster on gcc" means that gcc (GNU) is superior. But the patch is a preliminary version...
greetings, Ingo.
-----Ursprüngliche Nachricht----- Von: Norihiko Mukouyama [mailto:norihiko_m@jp.fujitsu.com] Gesendet: Mittwoch, 10. März 2004 01:50 An: Ingo at Pyrillion; 'Norberto Bensa' Cc: linux-kernel@vger.kernel.org Betreff: RE: Kernel 2.6.3 patch for Intel Compiler 8.0
Hi All!!
>I used the patch to compile two identical kernels with gcc 3.3.3 and >icc 8.0 with oprofile support built in. The optimization switches were >chosen quite conservative, i.e. "-O2 -Ob1", no IPO, and of course: no >MMX, SSE, and SSE2 stuff inside the kernel (thus disabling Intel's >great vectorizer). >Profiling: lmbench ran ten times but time measurements were taken from >oprofile (on Pentium 4, GLOBAL_POWER_EVENTS in kernel space only, >counter overflow: 3.000). >Results: 33% of the lmbench procs faster on icc, 66% faster on gcc.
Really???
If it is ture using icc 66% faster than gcc., It is wonderful. Could you show us detail data to lmbench results.
Thanks!!
Norihiko
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