We just solved a problem with our dspace tomcat instance running with very
high cpu usage, swinging up to 100% and more every few seconds and then
briefly down again. This occurred all day long and all night long, whether
the server was performing any work or not. We are running tomcat 8 with
java 8, and dspace 6.3.
This is really a tomcat problem, and I posted this in stackoverflow for the
tomcat users. But since we are dspace users too, and others might have
this problem, I am posting it here as well, in the hopes of helping
someone. We did not find our solution in a web search.
We had used the configuration option in the tomcat/conf/Catalina/localhost
directory, in which we pointed tomcat to another directory, other than its
own webapps directory. The xml files in this directory look like this:
<?xml version='1.0'?>
<Context
docBase="/opt/dspace/amaddev/dspace-6.3/webapps/jspui"
reloadable="true"
cachingAllowed="false"/>
And this worked, tomcat ran with the code in the dspace directories rather
than its own webapps directory. However, we had this problem with
continually spiking cpu usage.
To test, we removed the xml files from the conf/Catalina/localhost
directory, and restarted tomcat. Suddenly we had a normal, well-behaved
tomcat again. In order to point the tomcat to this other directory (where
we compile our dspace code), we just used the Host entry in
conf/server.xml, and changed the appBase setting to our dspace directory:
<Host name="localhost" appBase="/opt/dspace/amaddev/dspace-6.3/webapps"
unpackWARs="true" autoDeploy="true">
This now accomplishes what we wanted with a very low cpu usage (below 1%)
when the server is quiet.
Best,
Paul
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