worker thread performance question

[Petri Helenius]

Julian Elischer wrote:

>
>
> Petri Helenius wrote:
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>>
>> With libpthread is it usually optimal to have as many worker threads 
>> (CPU bound stuff) as kern.threads.virtual_cpu or have, say double the 
>> number so that there is always a thread in the run queue when another 
>> hits a mutex or sleep? 
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> Are they always runnable?

Almost, except when they run into shared structures which obviously are 
minimized by design.

> theoretically you can schedule as many as you want.
> any number > NCPU should keep teh system busy, but
> I'm not sure I fully understand the question.

The question was aimed towards if larger runqueue takes more CPU to 
maintain than a shorter one does and if threads are involuntarily switched.

Pete

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>>
>>
>> Pete
>>
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