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From: Florian Weimer <fw@deneb.enyo.de>
Newsgroups: comp.lang.java.programmer
Subject: Re: gc is freeing and claiming memory
Date: Sat, 13 Aug 2016 16:35:20 +0200
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* Cecil Westerhof:

> So while on the one hand there is 9 MB of memory freed, but at the
> same time there is another 4 MB reserved. (I have seen a bigger
> difference, there was on the one hand 4 MB freed and at the same time
> 32 MB extra reserved. But I did not save that.)
>
> What is happening here?

Maybe something related to GC ergonomics.  The JVM might try to resize
the heap to avoid too frequent collections.  For details, you need to
switch on GC debugging messages and look at GC statistics instead
overall system statistics.