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Re: The new scheduler and x86 CPUs
- To: vmakarov at redhat dot com, gcc at gcc dot gnu dot org
- Subject: Re: The new scheduler and x86 CPUs
- From: Toon Moene <moene at knmi dot nl>
- Date: Wed, 29 Aug 2001 09:01:48 +0000
- Organization: Royal Netherlands Meteorological Institute
Vladimir Makarov wrote:
> As for the data, I see the following
> Alpha 833Mhz: base : 643
> Itanium 800 Mhz: base: 701
> If 342 for Itanium were for gcc, I would not be surprised.
<Shrug> Look again. The 342 for Itanium vs. 544 for Alpha is for the
This makes it (again) clear why it is so dangerous to *only* look at the
bulk number for SPEC, something that SPEC keeps pointing out.
The reason why it is interesting to look at a weather forecasting
program (actually, apsi is a dispersion model based on a weather
forecasting model) is that these programs tend to *not* have a single
hotspot that you can easily design your compiler for.
Of course, this doesn't rule out that OOO implementations wouldn't run
out of steam eventually against newer paradigms, but the Itanium is
definitely not proof of that.
Toon Moene, KNMI, PO Box 201, 3730 AE De Bilt, The Netherlands.
Tel. +31302206443, Fax +31302210407, e-mail email@example.com