Hi, I think you are describing some "weird" unrealistic scenarios. There is typically no need to test "just solr" without relying on disk caches. Not using disk buffers will only work in trivial scenarios, but if you really want to test it, run something that hogs memory while running solr perf tests on the same server.
You often can't prewarm caches at the very beginning because you can't predict queries (not always true), so yes, initially caches will be empty, but then they will get filled and then you will (want to) use them. I don't think there is a way to clear Solr caches. I can't give more advice at this time, I don't fully understand what you are trying to test... Otis -- Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch ----- Original Message ---- > From: Phillip Farber <[EMAIL PROTECTED]> > To: solr-user@lucene.apache.org > Sent: Wednesday, August 20, 2008 1:34:20 PM > Subject: Testing query response time > > > > I would like to test query response time for a set of queries. I'm not > interested in capacity Q/sec, just response time. My queries will be > against an index of OCR'd books so in the real world every query is > probably unique and impossible to predict so I don't see a way to > prewarm any of the caches. I'm not sorting. I'm not faceting. I'm > querying on a few fields like title, author, subject and date in a range. > > Regarding initial conditions, it seems that there's no useful state into > which I can put the caches. Would the best approach be to run the > queries from a cold solr startup? > > What about OS disk caches? I can see two arguments. One, just to test > solr the disk caches should be empty. On the other hand, realistically, > the disk caches would be full so that argues for executing enough > queries to load those and then redo the query set (with empty solr caches). > > Speaking of empty solr caches, is there a way to flush those while solr > is running? > > What other system states do I need to control for to get a handle on > response time? > > Thanks and regards, > > Phil > ------------------------------------------ > Phillip Farber - http://www.umdl.umich.edu
