Solaris

I am working on Oracle 2 node RAC 10.2.0.4 on Solaris 10 T2000 kit.

The box has around 32G of memory of which 24G is used by oracle user. There is 3G of free memory on the box.
Sga max is set to 5G and while checking v$pgastat i see that maximum pga memory memory allocated was 6.5G. So oracle database is using around 12G of memory. There are no other processes running on the box except for the clusterware processes and the database.

Code:

NPROC USERNAME  SWAP   RSS MEMORY      TIME  CPU
  2958 oracle     30G   24G    75% 187:45:36 1.9%
    69 root      304M  420M   1.3%  19:54:52 0.1%
     1 daemon   4648K 8688K   0.0%   3:30:49 0.2%
     1 smmsp    1352K 8472K   0.0%   0:00:04 0.0%

There are around 2500 connections to this instance.
From the ps -ef OS command I see around 300 each of these connections.

Code:

/usr/bin/ssh -o FallBackToRsh=no -o PasswordAuthentication=no -o StrictHostKeyC
/oracle/product/cluster/jdk/jre/bin/sparcv9/java -classpath /or

When I check prstat for specific /oracle/product/cluster/jdk/jre/bin/sparcv9/java process I see that

Code:

PID USERNAME  SIZE   RSS STATE  PRI NICE      TIME  CPU PROCESS/NLWP
 18696 oracle     77M   28M sleep   29   10   0:14:27 0.0% java/17

For /usr/bin/ssh process

Code:

PID USERNAME  SIZE   RSS STATE  PRI NICE      TIME  CPU PROCESS/NLWP
  2756 oracle   6328K 3032K sleep   29   10   0:00:00 0.0% ssh/1

I am not sure about how the remaining 12G is used by oracle sessions?
How can I confirm the total memory usage by java process and the memory usage by clusterware?
Am I missing something here?