How do I determine the JVM heap size default values??
Note that I'm not interested in setting or modifying its initial, minimum, or maximum size before/while running my application. I just want to know what it is on a given machine if I do nothing!
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You may want to read this previous question. http://stackoverflow.com/questions/4667483/how-is-the-default-java-heap-size-determined – Sean Sep 16 '11 at 19:20
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The Java 7 docs: http://download.oracle.com/javase/7/docs/technotes/guides/vm/gc-ergonomics.html – Sean Sep 16 '11 at 19:22
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If you care what it is you should set it. – Peter Lawrey Sep 16 '11 at 19:42
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256 MB is default Heap size. http://www.ibm.com/developerworks/wikis/display/xdoo/Modifying+the+JVM+heap+size – Samir Mangroliya Sep 16 '11 at 18:31
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Thanks Divyesh, but the more I read, the more I find different values that are true only under certain conditions. I'm trying to ask the JVM or the System directly.. – Marsellus Wallace Sep 16 '11 at 19:11
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Yes its change under cretain condition ............... – Samir Mangroliya Sep 16 '11 at 19:35
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Runtime.getRuntime().totalMemory();
Mysticial
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The heap will dynamically grow/shrink as you use more/less memory. I think the JVM itself has a bunch of overhead as well. – Mysticial Sep 16 '11 at 18:53