Barry Bishop
Thu, 05 Aug 2010 00:26:09 -0700
Hi Ryan, This is indeed strange behaviour. I will not speculate right now what might be causing it, but we will investigate straight away and get back to you with some information.
If the issue is memory related then it is entirely possible that little or nothing is logged. Generally catalina.out or stdout.log (has various names depending on platform) are the places to look. Thanks very much for bringing it to our attention. Regards, barry -- Barry Bishop OWLIM Product Manager Ontotext AD Tel: +43 650 2000 237 email: barry.bis...@ontotext.com www.ontotext.com On 04/08/2010 17:15, Ryan Senior wrote: > Hello, > > I'm seeing some odd behavior when doing some performance testing of > SwiftOWLIM and don't know how to troubleshoot the issue further. The > benchmark I'm using is SP^2 (found here: > http://dbis.informatik.uni-freiburg.de/index.php?project=SP2B). Also on > that site is a program to generate datasets for use in the test. Using > a dataset of size 10,000, 50,000 or 250,000 triples, I do not see this > issue. Only on 1 million triples. > > When running the second query in the benchmark, it runs successfully 16 > times at roughly 32 seconds each invocation. Then the 17th time, the > client issues the query and no response is given after 1 hour (and so my > code times out the query). From here the triplestore seems to be in > some inconsistent state, even though the machine is rebooted. The next > query will run fine to completion (3a from the above paper) however > every subsequent query will not return any results. The server responds > back (there is no timeout) however, always responding with no results, > when there should be some. I am getting this behavior consistently (8 > out of the 8 times I have ran it). > > Software Info: > > SwiftOWLIM 3.3 > Sesame 2.3.2 > JDK 1.6.0 rev 20 > Tomcat 6 > > The only real configuration change made from the install instructions is > increasing the max heap available to Tomcat from 128m to 3g. The > machine used for the test is an Amazon EC2 m1.large instance and has the > below characteristics: > > Ubuntu 10.04 - 64-bit > 7.5 GB memory > 2 CPU ~1.5Ghz each > 15GB Disk > > I looked at catalina.out to see if anything was logged about this and I > didn't see anything. Is there somewhere else to look for log > information? Is there some way to view other bits of runtime > information to see if there is something wrong with the running instance? > > Thanks, > > Ryan > > > > _______________________________________________ > OWLIM-discussion mailing list > OWLIM-discussion@ontotext.com > http://ontotext.com/mailman/listinfo/owlim-discussion _______________________________________________ OWLIM-discussion mailing list OWLIM-discussion@ontotext.com http://ontotext.com/mailman/listinfo/owlim-discussion