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Editorial Team
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Asked: 2026-05-15T02:12:52+00:00

I’ve got a Red Hat box with 6G memory running Tomcat and I’m trying

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I’ve got a Red Hat box with 6G memory running Tomcat and I’m trying to figure out how much memory I have left on the box. Problem is, top & jconsole is showing one figure (around 200M), and system monitor is showing a different figure (around 2G). Does anybody know what the difference is?

I’m not sure if there is a memory leak happenning here, but the highest memory consumer is a tomcat process that’s taking 2.2G of memory.

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  1. Editorial Team

    Clearly, top is telling you that Tomcat is only using 38% of your available memory. Your problem (if there is a problem) is with whatever is using the remaining 62% of memory.

    I suspect that it is being used for disc block / file system caching. (Run the free command and I expect that you should see a high value for “cached” that roughly corresponds in size to the missing pages.)

    If your system has a large number of pages in the cache, it is a GOOD THING. All those cached disc blocks will make read access to your file system nice and fast. (And if the OS needs physical pages for something more important … like running applications … it can quickly reclaim them from the disc cache.)

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