Paul A schreef op do 29-01-2015 om 19:39 [-0500]: > Facets appear to have a huge overhead in various components of Zebra, > to > the point where a single core of a multiple processor CPU gets > overwhelmed, > but does not share the load with other totally idle cores.
That's not how multiprocessor systems work. They can only spread load amongst other cores if the software is multithreaded/multiprocess, which I suspect zebra isn't, at least within a single request. If it does all its work in a single thread, then it can't spread across multiple cores. > Intel tell me > that this is not fixable through any hardware/BIOS config and they are > not > aware of a Linux "standard library" that deals with processor > affinity. I've searched around a little and found mentions for c and > FORTRAN (marvelous old memories for me!) but so far nothing totally > specific for Perl. Zebra is not Perl, zebra is (I think) C. But still, unless it's written with multithreading in mind, you can't do anything about it. > > taskset and sched_setaffinity might be usable at system > level Unless you have very specific use cases (which you don't), these won't help. > > , and I might have a look at pthread_setaffinity_np.3.gz That will only help if you plan on rewriting zebra to use pthreads. I don't recommend rewriting zebra. -- Robin Sheat Catalyst IT Ltd. ✆ +64 4 803 2204 GPG: 5FA7 4B49 1E4D CAA4 4C38 8505 77F5 B724 F871 3BDF
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