On Fri, Nov 27, 2009 at 9:30 AM, Girish Redekar <girish.rede...@aplopio.com> wrote: > Hi > > I'm testing my Solr instance with multiple simultaneous requests. Here's my > test. > > 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
This may point to another bottleneck - if the OS is low on free RAM, it could be disk IO. If this is on Windows, you could have contention reading the index files. Otherwise, you may have a bottleneck in network IO. Is the client you are testing with on the same box? Is this Solr 1.4? -Yonik http://www.lucidimagination.com
