[fpc-pascal] Optimal number of threads for SMP
mschnell at lumino.de
Fri Sep 19 10:17:45 CEST 2014
On 09/15/2014 11:19 AM, Marco van de Voort wrote:
> too many threads increasing switching time and thus decreases performance
Not only this.
Additionally Linux tries to keep a thread/Task at the same CPU when
re-scheduling the CPUs. By this the count of misses on the (primary)
caches is decreased.
AFAIK, cache misses can result in a huge degradation.
Hence - depending on the task to be done - using more threads than CPUs
might not be a good idea.
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