Assuming I have enough RAM then, should I be able to get a performance boost with my current setup? Basically, the question I am trying to answer is - will the Tomcat+Solr setup I have above utilize multiple processors or do I need to do something else (like having a different tomcat instance for each Solr shard)?
Also - and this question comes purely out of my own ignorance of how the Tomcat/Solr relationship works - right now I'm starting Tomcat specifying the maximum memory size. I'm also setting cache parameters in solrconfig.xml for each solr instance to half of what I would for a full size index. Shouldn't the JVMs for both instances use roughly the same total amount of memory as 1 JVM for the full size index? While I'm testing things out on a 2 processor machine, I'll eventually be using an 8 proc. machine with plenty of RAM to cache the index in RAM. I'm not super worried about requests/sec. right now - I'd rather each individual search be faster, which is why I'm interested in distributing the index across my 8 procs. Thanks very much! -Harish yonik wrote: > > On Thu, Jan 8, 2009 at 4:51 PM, smock <harish.agar...@gmail.com> wrote: >> Thanks for the reply - could you please give me some more details on what >> you mean? > > If there isn't enough memory to cache the index in RAM, then your > bottleneck could be from retrieving stored fields from disk. > Distributed search will make this much worse because you have 2 JVMs > eating up memory instead of one, further lowering the cache hit ratio > of the OS disk cache. > > With a 2 CPU machine, a single Solr index is advisable, esp for web > traffic where there will be plenty of requests to keep both CPUs busy. > > -Yonik > > -- View this message in context: http://www.nabble.com/Solr-on-a-multiprocessor-machine-tp21360747p21362886.html Sent from the Solr - User mailing list archive at Nabble.com.
