You can balance the thread activity without randomly migrating a thread
between processors (which, of course, thrashes the blazes out of the cache).
Chris
On 11/30/05 2:09 AM, "Jonas Maebe" <email@hidden> wrote:
>
> On 29 nov 2005, at 22:07, Ian Ollmann wrote:
>
>> Right now, we don't have thread affinity, so any such information
>> would be immediately stale. That is, even if you were able to get
>> your threads started off on all the right processors they wouldn't
>> stay there. You can actually see this on a MP machine with a single
>> threaded app, using the Activity Monitor. It will migrate back and
>> forth among the processors over time.
>
> To be honest, I thought this was intentional to keep both processors
> more or less at the same load level and thus temperature, allowing
> for less fan activity. If this would be fixed in the future, I think
> it would be a good idea to disable it at least in "Reduced"
> performance mode (and possibly also automatic as long as the load is
> below "75% * ncpu" or so).
>
>
> Jonas
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