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To: Dimitry Andric <dimitry@andric.com>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Tue, 02 Mar 2004 19:32:11 +0100."
             <1942228052.20040302193211@andric.com> 
Date: Tue, 02 Mar 2004 19:36:47 +0100
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cc: freebsd-current@freebsd.org
cc: Colin Percival <colin.percival@wadham.ox.ac.uk>
Subject: Re: detecting overheating processors? 
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In message <1942228052.20040302193211@andric.com>, Dimitry Andric writes:

>> I would prefer to have a program called "stress" which could be run
>> at any time to test hardware.
>
>It's called "make buildworld". ;)

In fact it isn't (anymore).

I've seen modern hardware run buildworld for days, but explode on
scientific FP work in a few minutes.

It used to be the case that buildworld would stress a CPU, but with
all the specialty circuitry put into CPUs these days, buildworld
probably ends up using the MMX and SSE extension silicon as a
heatsink.

A real stress-test would be something which engages bus-interface,
integer, floating point and preferably any "extensions" as well.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.