I've been working on benchmarking our solr response times in relation to
the a variable number of concurrent queries. With maxThreads=150 - I've
tried running between 20-100 queries concurrently against our solr
instance and have noted that for all n-way (>20) queries I'm finding
that performance flatlines at 20-30 requests/second.
We've tried tuning caches and while part of the poor performance is
down to poor query formulation - I find the lack of seeing either
performance improvement or degradation as being indicative of some kind
of throttling.
Not sure if this is the case or not however as a novice in these realms
I would appreciate some guidance as to what I should be looking at and
where we might be able to tune/investigate?
We've ruled out disk contention and network latency.
Useful metrics:
maxThreads:150
filterCache Size; 16384
queryResultCache size: 16384
documentCache size: 10502
I'm running Solr/Lucene version:
Solr Specification Version: 1.3.0.2009.08.19.15.54.27Solr Implementation
Version: 1.4-dev ${svnversion} - rafiq - 2009-08-19 15:54:27Lucene
Specification Version: 2.9-dev
Would be grateful for any pointers and can furnish more details.
--
Raf Gemmail
Software Engineer
www.tmdr.com
0207 3489 912
Extension: 5112
Raf Gemmail
Senior Developer
www.tmdr.com
d: 0207 3489 912
t: 0845 468 0568
f: 0845 468 0868
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