java process memory usage is higher than Xmx

[yao]

Hi Aaron,


Is this the RES column from top?
>

Yes, it is.

Are you using JNI, bytebuffers or anything else that would allocate
> off-heap memory?
>

It is original HBase region server process, we never modify the code. It
might use off-heap memory internally but the problem is, similar machine
running under Java 6 with CMS do not have this problem and the real memory
usage is very close to Xmx.

In our case, the permgen seems not very high and I don't think stack would
be a problem. I am now wondering, does anyone use G1 (with large heap)
experience this memory usage issue (larger than Xmx a lot) ?

Perm Generation:
   capacity = 33554432 (32.0MB)
   used     = 31725872 (30.256149291992188MB)
   free     = 1828560 (1.7438507080078125MB)
   94.55046653747559% used

-Shengzhe
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