[NTLUG:Discuss] What does RSS include?

[Neil Aggarwal]

Hello all:

Forgive my ignorance if this is a silly question.  This is definitely
not my area of expertise.

I have Tomat running on my RedHat 9 machine with the IBM JDK.
When I run /proc/25046/status, I get this output:

Name:   java
State:  S (sleeping)
Tgid:   25046
Pid:    25046
PPid:   1
TracerPid:      0
Uid:    0       0       0       0
Gid:    0       0       0       0
FDSize: 256
Groups: 0 1 2 3 4 6 10 
VmSize:   677820 kB
VmLck:         0 kB
VmRSS:    346936 kB
VmData:   670544 kB
VmStk:       260 kB
VmExe:        28 kB
VmLib:      6484 kB
SigPnd: 0000000000000000
SigBlk: 0000000080004207
SigIgn: 8000000000001000
SigCgt: 1000000381804eff
CapInh: 0000000000000000
CapPrm: 00000000fffffeff
CapEff: 00000000fffffeff

As you can see, the RSS is about 340MB.

I have verbose output of the garbage collector for the JVM and it
tells me that the heap is about 256 MB.  

So, there is about 80 MB of stuff in the RSS that I cannot account for.

Does anyone know what that could be?  

Are there any utilities to help me to identify what it could be?

Thanks,
	Neil

--
Neil Aggarwal, JAMM Consulting, (972)612-6056, www.JAMMConsulting.com
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