we experienced very similar behaviour with nearly the same usecase. i reported
one bug which was in our case temporarily solved by turning off context index.
recently i found other very similar issue, which is not reportwd yet as i cant
figure out the cause. look pls into catalina.out whether there is not log
"error in predicate statistics" which appears in both mentioned issues. maybe
we hit the same problem.
best regards,
marek
-----Original Message-----
From: "Stefano Parmesan" <parme...@spaziodati.eu>
Sent: 28.3.2013 12:09
To: "owlim-discussion@ontotext.com" <owlim-discussion@ontotext.com>
Subject: [Owlim-discussion] Owlim-SE not responding with high CPU load
Hi everybody,
We are evaluating Owlim-SE 5.3.5849 but we are encountering some issues:
Our test repository contains around 1 million triples (around 100 of those are
owl:sameAs) and have concurrent applications both inserting and querying
(through sesame-console and the sparql endpoint provided by the
sesame-workbench). The machine is a 12-core 64GB ram debian machine. Everything
worked fine as of today, when something happened while we were submitting a
high load to the sparql endpoint. Since then, tomcat7 uses from 200% to 650% of
cpu, and the sparql endpoint does not respond with even simple queries.
We tried restarting tomcat7 multiple times, but as soon as it comes back the
CPU usage increases again and there's no way to do anything (through both
sesame-workbench and sesame-console).
Could this be due to some misconfiguration? Is this a known issue? How can we
know what's really happening (apart from checking .aduna/openrdf-sesame/logs)?
We could clear the repository and start from scratch, but as we are evaluating
Owlim for production usage we need to find out what's the issue to better
understand if it fits our needs.
--
Dott. Stefano Parmesan
Web Developer ~ SpazioDati s.r.l.
Via del Brennero, 52 – 38122 Trento – Italy
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