Re: JB2005 memory issues?

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#274

From: Shankar Unni
Date: Tue, 05 Oct 2004 17:59

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none wrote:
> I'm running the demo on suse 9.1 pro.
> Just have one project open and its at 662 megs ram utilization for the
> jbuilder executeable and 234 megs for the jbuilder java binary.

Process accounting on Linux takes a bit of getting used to.

When you start Java with, say, -Xmx512m (as I suspect the enterprise 
version does), Java memory-maps 512MB worth of VM (which is what you see 
in the ps display as the "process size"), though it actually touches 
only a small part of that to start with.

Also, any files that are memory-mapped using java.nio.MappedByteBuffer 
show up as VM usage.

How are you measuring the usage? "top" is the usual tool. In top, the 
"Size" is the VM mapping size, but that's a misleading indicator. "RSS" 
is the true indicator of memory usage, the "Resident Set Size".  See 
what that value is..

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