We have 60 instances of tomcat 5.X running on an RHEL4 server. Each instance runs a copy of basically the same application, each for a different customer. According to their respective status pages, the tomcats are all configured to use a maximum of 64MB memory, but most peak at around 48MB. However, in 'top' I see that all of the java processes have a virtual image size of approximately 256MB. The resident sizes of the java processes vary wildly from 32MB to 147MB. Can someone help me understand why tomcat is configured to use 64MB, but claims to peak at 48MB, but has resident size of 147MB, and a virtual size of 256MB, while other instances of tomcat have java processes with a resident size of 32MB? Note that these numbers were captured in the middle of the night, after all tomcats had been restarted, and nobody is using the system. --Eric
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