On quinta-feira, 4 de outubro de 2012 16.04.41, Bo Thorsen wrote: > Den 04-10-2012 15:51, Thiago Macieira skrev: > > On quinta-feira, 4 de outubro de 2012 15.46.57, André Somers wrote: > >> If you think that running 21 threads on an 8 core system will run make > >> your task go faster, then Thiago is right: you don't understand your > >> problem. > > > > If you run 8 threads on an 8-core system and they use the CPU fully, then > > you're running as fast as you can. > > That might not be the case because he said the threads are writing to > disk. I/O use could mean that #threads > #cores is faster. But if the > computations are heavy enough, this could be wrong. Depends on what the > code does.
Ah, yes, but note the "they use the CPU fully" and "all threads are ready to be executed" in the other paragraph. :-) > That said, I'd be surprised if he actually did understand the problem > completely, based on the question :P -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center
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