java process memory is greater than xmx and MaxMetaspaceSize combined Why?

Asked Mar 08 '22 at 10:02

Active Mar 08 '22 at 10:02

Viewed 27 times

I am running java process with below options.

-Xms2g -Xmx2g -Xss256k -XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=256m -Dfile.encoding=UTF-8 -jar

The res and %mem values that can be checked with the top command in centos7 are

Use 2.6 GB, which is larger than 2.256 GB combined with xmx and XX:MaxMetaspaceSize .

Also, %mem is increasing slightly.

What I expected is that the java process memory does not exceed 2.256gb.

Why?

asked Mar 08 '22 at 10:02

WooSub Shin

1

Off-heap space? There are many things that jvm uses for off-heap. – Eugene Mar 08 '22 at 10:04
If so, is the continuous increase in off-heap due to my coding mistake? – WooSub Shin Mar 08 '22 at 10:20
I doubt it, in the rarest cases it could, but very rare. This is kind of normal, really. – Eugene Mar 08 '22 at 10:21
When the heap area was monitored using jconsole, the heap area was being managed normally. So it's not my coding mistake? – WooSub Shin Mar 08 '22 at 10:25

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