I have progressed a little further on this subject using multiple parallel
tests for from 0 to ~25k biblios on a new, relatively fast server. In brief:
3.08 averages 0.88 secs per search
3.18 averages 5.06 secs for the same searches, but...
3.18 averages only 1.52 secs if I turn off facets.
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. 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. taskset and sched_setaffinity might be usable at system
level, and I might have a look at pthread_setaffinity_np.3.gz
I've posted test results, notes and three sets of NYTProf analysis at
<http://navalmarinearchive.com/z_koha/> and would appreciate if anyone has
any suggestions or comparative tests and outcomes.
Thanks and best regards -- Paul
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