[Koha-devel] Search speed

[Fridolin SOMERS]

You can launch Zebra multi-threaded using :
zebrasrv -T

Le 30/01/2015 02:59, Robin Sheat a écrit :
> 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.
>
>
>
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