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From Girish Redekar <>
Subject Solr CPU usage
Date Fri, 27 Nov 2009 14:30:39 GMT

I'm testing my Solr instance with multiple simultaneous requests. Here's my

For an index of ~200K docs, I query Solr with 10 simultaneous threads. Can
someone help me explain/improve the following observations:

1) Solr doesn't seem to use all the available CPU to improve response times
(query times are good, but the time required to return documents aren't so
good). My CPU seems to be running at ~30%
2) As expected, time for response increases as the num of requested results
increase. What's surprising (and perplexing) is that Solr seems to use
*more* of the CPU when I'm requesting *fewer* docs. Consequently, its
performance in returning a larger result set is very bad
3) To counter 1, is there a way to make two Solr instances search on the
same index (so that concurrent requests are served faster)

Any help in this regard would be very useful.

Thanks !
Girish Redekar

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