Running Jenkins v1.517 on Windows 2003 R2 server on HP DL580 (four quad-core processor and 64GB memory) hardware.
Jenkins configuration in jenkins.xml:
<executable>%BASE%\jre\bin\java</executable>
<arguments>-Xrs -Xmx1024m -XX:MaxPermSize=512M -XX:+HeapDumpOnOutOfMemoryError -Dhudson.lifecycle=hudson.lifecycle.WindowsServiceLifecycle -jar "%BASE%\jenkins.war" --httpPort=8080</arguments>
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Have to restart Jenkins weekly to bring down the cpu and memory usage to normal.