[Koha-devel] Search speed

[Paul A]

At 05:40 PM 1/30/2015 +0100, Fridolin SOMERS wrote:
>You can launch Zebra multi-threaded using :
>zebrasrv -T

Fridolin - merci mille fois -- first impressions are most positive.  I'll 
try and find time later today to quantify the results and put them in 
context of my previous tests.

[vi /usr/share/koha/bin/koha-zebra-ctl.sh line 40 to ZEBRAOPTIONS="-T -v 
none,fatal,warn"]

J'aurais bien aimer trouver ça tout seul ... mais encore une fois avec mes 
remerciments.

Meilleures amitiés et a+
Paul


>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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>
>--
>Fridolin SOMERS
>Biblibre - Pôles support et système
>fridolin.somers at biblibre.com
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