You can't really _force_ the JVM to perform the GC and clean up the
heap, although you can _suggest_ it via System.gc()
You can try playing with this:
private static long gc()
{
long freeMemBefore = Runtime.getRuntime().freeMemory();
System.out.println("Free Memory Before: " + freeMemBefore);
System.gc();
try {
Thread.sleep(1000);
System.runFinalization();
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.gc();
long freeMemAfter = Runtime.getRuntime().freeMemory();
System.out.println("Total Memory : " +
Runtime.getRuntime().totalMemory());
System.out.println("Max Memory : " +
Runtime.getRuntime().maxMemory());
System.out.println("Free Memory After : " + freeMemAfter);
return freeMemBefore-freeMemAfter;
}
Otis
--- "Aigner, Thomas" <[EMAIL PROTECTED]> wrote:
> Please forgive my jumping on this thread, but I have a similar issue.
> I
> have a server process on Linux that creates the java process (java
> -Xms256m -Xmx512m -jar Suchmaschine.jar). The problem is that after
> the
> processing is done, the memory is retained. Is there a collection
> argument that would shrink the java memory pool back down to the min?
>
> Thanks,
> Tom
>
> -----Original Message-----
> From: Otis Gospodnetic [mailto:[EMAIL PROTECTED]
> Sent: Thursday, August 11, 2005 11:15 AM
> To: java-user@lucene.apache.org
> Subject: Re: OutOfMemoryError on addIndexes()
>
> > > Is -Xmx case sensitive? Should it be 1000m instead of 1000M?
> Not
> > > sure.
> > >
> >
> > I'am starting with:
> > java -Xms256M -Xmx512M -jar Suchmaschine.jar
>
> And if you look at the size of your JVM, does it really use all 512
> MB?
> If it does not, maybe you can try this:
>
> java -Xms256m -Xmx512m -jar Suchmaschine.jar
>
> If that doesn't help, it would be good to run this under a profiler
> and
> see what eats your memory.
>
> Otis
> P.S.
> I recall reading that using the same amount for Xms and Xmx results
> in
> better performance. Also, consider using -server option (Hotspot),
> if
> you are using Sun's JVM.
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