Re: Thermal scheduling
Re: Thermal scheduling
- Subject: Re: Thermal scheduling
- From: Brian Bergstrand <email@hidden>
- Date: Wed, 29 Sep 2004 10:49:42 -0500
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John,
Make sure that System Prefrences->Engery Saver->Options->Processor
Performance is set to "Highest". The default of "Automatic" can affect
processor performance quite a lot in certain situations. This may be
what you are seeing.
HTH.
On Sep 29, 2004, at 10:00 AM, John Siracusa wrote:
>
> The observed result of the test program is that it runs at X
> iterations/sec
> for some time, then drops to X - N iterations/sec for the remainder.
> The
> drop seems to coincide with a CPU temp that passes some threshold.
>
> This drop is not seen on any Macs other than the dual 2.5GHz Power
> Mac. The
> concern is that people buying a 2.5GHz Mac (at great expense) cannot
> use the
> full capacity of the CPUs for more than a short period of time.
> ...
> The goal is not to throttle the CPU, but to make it run a particular
> task
> using all available CPU resources. Obviously there is some overhead
> for the
> OS, etc., but the one-time drop-off in speed on the 2.5GHz Power Mac
> (and
> nowhere else when running the same code, same OS, etc.) has led some
> people
> to believe that the issue is CPU heat, and that the OS (or maybe even
> the
> hardware itself) is compensating for it by slowing down slightly.
>
> -John
>
Brian Bergstrand <http://www.bergstrand.org/brian/>, AIM: triryche206
PGP Key: <http://www.bergstrand.org/brian/misc/public_key.txt>
One of the lessons of history is that nothing is often a good thing to
do and always a clever thing to say. - Will Durant
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