Java is taking more memory than configured!

[sreekanth.munarai]

Hi All,

I have observed suspicious memory behavior in Jboss/Jvisulavm.

I have JBoss7.1.0 running on Windows OS. Have configured configurations as below

"-Xms64M -Xmx512M -XX:MaxPermSize=256M"

However, when i monitor in JvisualVm,

"Size: 454,426,624 B Max: 536,870,912 B Used: 299,350,616 B"

As mentioned above, Max size is more than configured value and same goes for perm size as below:

"Size: 208,928,768 B  Max: 268,435,456 B Used: 151,287,656 B" as we have maxpermsize=256MB.

is this normal behavior or any memory leak issue?and Please advice.

Thanks,

Sreekanth

[jaysensharma]

The values are in Bytes when you see it from VisualVM

Example:  (PermSize)

"Size: 208,928,768 B  Max: 268,435,456 B Used:B" as we have maxpermsize=256MB.

(Max) 268,435,456 Bytes  = 262144 KB  = 256 MB

(Used) 151,287,656 Bytes = 147741 KB  =  144 MB 

  What do you think How much memory should it be using?  If you are expecting less memory consumption then can you please let us know why? And Which kind of application are you running ?

Regards

Jay SenSharma

[sreekanth.munarai]

Hi Jay,

Sorry for late revert. You are absolutely correct, i was misunderstood  somewhere. Thanks