On 2/9/23 12:54, Christopher Schultz wrote:
It would be unusual for the OS to reclaim any of that memory from the
JVM process. Are you looking at OS heap usage, or "JVM heap" usage? From
your description above, it's tough to tell. The tool is called WRKJVMJOB
so presumably it knows what the heck a JVM is, so maybe you were getting
the exact numbers I was recommending.
TL;DR: I have seen Java return memory to the OS.
On the Oracle JVM, I think that happens with G1GC when -Xms is less than
-Xmx. I think G1 is the only collector in Java 8 that does this, but I
can't say that for sure. I don't see anything in the thread about
precise JVM options.
Someone mentioned the J9 JVM, and I don't know if that behaves the same
as Oracle.
Thanks,
Shawn
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