I assume that your reason for asking the question is because you are experiencing some performance issues.
The optimal JVM settings differ for each install but it is worth reviewing the resources at https://confluence.atlassian.com/display/JIRAKB/Crashes+and+Performance+Issues+Troubleshooting as these will help you with troubleshooting your settings.
yes it does seem a little perverse at times the allocation of memory.
I would look at the page <yourhost>/secure/admin/ViewMemoryInfo.jspa for any particular pain points. But be aware that a 100% usage is not always a bad thing.
If you have a monitoring tool in place it is a good idea to benchmark some changes so that you can see what your normal performance is and then what difference a small change makes to that performance. Typically you should capture this information over a reasonable (~1 week) period unless the performance degradation is very obvious.
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