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From "Robinson, Eric" <>
Subject Showing Tomcat Memory Utilization with 'top'
Date Tue, 22 Jun 2010 18:44:38 GMT
In top, my java processes all show an average VIRT size of about 250MB
and an average RES size of about 150MB. Most of them were started with a
64MB heap size. I have two questions:

1. Top shows 0k of swap usage, so the system is not swapping. In that
case, why is there a difference between the VIRT and RES numbers? My
understanding is that RES=CODE+DATA and VIRT=RES+SWAP. If swap=0, then
should not RES and VIRT be the same?

2. Where does the 64MB of java heap show up?

Eric Robinson

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