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java -Xmn and -Xmx options

 
Karthik Veeramani
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I have a java application that runs on solaris and windows. Its started with java's -Xmn and -Xmx options, with values 64 MB and 128 MB respectively. On Windows, it is starting up with 20 MB, but on solaris, it starts up with a whopping 117 MB! And after a while, it reaches 180 MB, and goes down with OutOfMemory error. All this only on solaris and not on win2k.... The code is totally independent of the platform. Does any one have a clue what could be the reason?
Also, please help me understand what exactly the Xmn and Xmx options mean? Does this mean, there is a guarantee the max memory will not cross the value specified in Xmx?
Just an additional info, I used the 'top' command to monitor the mem on solaris. The virtual memory used for this process, during its startup is reported as 117 MB as I said.
This is very critical and urgent to me, so any help will be greatly appreciated.
 
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