How to force full gc on sun/oracle jvm, to perform memory alignment/compaction in old gen

Question

I have a application that has a huge heap (around 100GB), and during initialization it allocates almost all avaliable memory with different caches. The problem is that this initialization phase allocates lots of object that cause a painful de-fragmentation of old gen. So my idea is to force full gc as a last step of initialization phase to align/compact old gen and reduce probability of "Concurrent mode failure" in runtime.

Is there any way of forcing such a collection ?

Thanks

Well according to javadoc it does not guaranty that gc will fire. — Tomek, Jan 03 '12 at 15:59
I don't think anything guarantees this, but maybe I'm mistaken — fge, Jan 03 '12 at 16:04

score 0 · Answer 1 · edited May 23 '17 at 11:48

0

Basically, you should run out of your memory and then call to gc should work.

Consider this way http://www.informit.com/articles/article.aspx?p=19703

You can try also this one https://stackoverflow.com/a/6915221/1137529 but I am not sure if it will actually work fine.

edited May 23 '17 at 11:48

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answered Jan 09 '12 at 19:05

alexsmail

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How to force full gc on sun/oracle jvm, to perform memory alignment/compaction in old gen

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