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    <p>Part of my current job is the care and feeding of a large java application that was designed to run with a large amount of memory (currently around 8 Gb), mostly due to ongoing calculations with lots of cached data. I did the initial deployment with the standard GC setup , mostly because there wasn't a simple way to simulate the production environment running at full tilt. </p> <p>In stages, over the next few months, I've customized the GC settings. Generally, the biggest available knob seems to be adjusting the frequency and magnitude of incremental gc - the biggest improvement has been in trading off large periodic gc for smaller and more frequent ones. But we've definitely been able to see performance improvements. </p> <p>I'm not going to post my specific settings because a) they're specific to our setup, and b) because I don't have them handy :). But in general, what I've found is</p> <ul> <li>there's been a lot of work done in tuning the default gc settings. <em>Almost</em> always the defaults work better than any tweaks I would make.</li> <li>At least for me, the situations where gc tuning was actually worthwhile were extreme enough that it was unreasonable to attempt to simulate them, so I had to do it experimentally and incrementally.</li> </ul> <p><a href="https://stackoverflow.com/questions/202502/appropriate-tomcat-5-5-start-up-parameters-to-tune-jvm-for-extremely-high-demand/202555#202555">Here's</a> a good reference from a prev. stackoverflow discussion.</p>
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