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Proper use of JVM XMs and XMx settings

I've configured Tomcat to run with -XMs1024m -XMx1024m, and am interested to know GC performs when the -XMs and XMx are the same value.Would it generally be better to have a lower -xms value?
[206 byte] By [damionsteena] at [2007-11-15]
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The -XMs only tells the VM how much memory to initially allocate, and doesn't have any correlation with normal operation of GC. I've used -XMs in the past when I know my memory requirements are pretty large, and that way will keep the VM from continuing to dynamically allocate more and more memory up to the XMx setting.

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