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geoaxis
Asked: 2012-01-19 05:20:43 +0800 CST

JVM Max heap size

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For an application I use JVM Max heap setting when starting it on both a test environment and a production system. When i connect via JMX to monitor the application I see that the max heap size of production app is not the same as test application. I use -Xmx2000m on both and on test environment I get 1,864,171,520 B and on production I get 2,009,726,976 B.

So my questions are -Is this info reliable. The Java versions and the machines are identical (Mac OS X 10.5).

-If this info is reliable then what could be causing this and how can it be changed so both systems behave the same for max heap size setting.

java mac-osx jmx

1 Answers

  1. The JVM will not automatically allocated the -Xmx amount of memory, so very minor environmental differences could cause the two virtual machines to end up with different process sizes (and for 2 GB, 139 MB is and arguably small difference, no ?)

    See this post on JVM Memory Usage.

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