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    <p>The JVM memory limit is related the largest free <strong>contiguous</strong> block available, not the amount of free memory. The limit varies from about 1.4 GB to a bit over 2.0 GB, and depends on where your operating system puts various things in memory. I don't know the particulars of where Redhat or Suse load stuff into memory, but it could be that suse is mapping some library to an address in the middle of RAM, where Redhat might map it at the end (speculating). </p> <p>And remember that your actual memory usage in java is <em>more than</em> what you specify for Xmx. The other memory settings also affect the size of your heap (like permgen). So it could also be that the perm space on Suse has a larget default than on Redhat. </p> <p>Also, depending on the memory allocation profile of your application, you might get away with a smaller heap size and different garbage collecting options. There are some details here (<a href="http://java.sun.com/performance/reference/whitepapers/tuning.html" rel="nofollow noreferrer">http://java.sun.com/performance/reference/whitepapers/tuning.html</a>) and other places. For example, if you allocate a lot of small, temporary blocks, you'll want different GC settings than if you have a lot of bit, long-lived objects. </p> <p>Regarding the linked question, why not just use Redhat? That might be a simplistic solution, but I guarantee it's going to fix your problem faster than deeply delving into the arcane world of java tuning and OS memory management :P</p>
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    1. COthanks for the explanation. The allocation bit makes sense and might explain it. If it were up to me I'd gladly switch to Redhat... however our company has switched to SuSE and as such our 'new' machines are all SuSE :(. As for dropping our max heap size, we'd love to but at the moment it's not possible. Plans are in the works to reduce our memory usage though.
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