i need to find memory usage by JVM in shell prompt,
i tried with
pidVal=$( ps -ef | grep "/opt/bea2/jrockit/bin/java -jrockit" | grep -v grep | awk -F' ' '{print $2}' | tr "\n" "," | cut -d ',' -f1 )
top -b -n 1 | grep $pidVal
this will just give cpu usage and ram... How do i find the actual memory usage of JVM,
from Server monitoring console (Hyperic)( HQ health) it will show consumption in real time. i need to find the same at shell prompt. Any help wil be deeply appreciated.
Have a look at jstat.
What OS: Linux, Solaris, ... other?
On Linux this will give you what the OS sees as resident for all java processes (use -ovsz for virtual):
ps -orss= -p$(/sbin/pidof java)
With jrockit you could also use jrcmd <pid> print_memusage for more detailed info.
i tried the command (i am using linux)
below which one is memory allocated and memory free or used?
# ps -orss= -p $(/sbin/pidof java)
597712
105300
47364
143556
1441024
4416636
1080604
3922112
132776
118644
]# jrcmd $pidVal print_memusage
9457:
Total mapped 2864288KB (reserved=1325008KB)
- Java heap 1048576KB (reserved=0KB)
- GC tables 35084KB
- Thread stacks 25204KB (#threads=56)
- Compiled code 1048576KB (used=15421KB)
- Internal 1864KB
- OS 236040KB
- Other 327120KB
- Classblocks 7936KB (malloced=7755KB #20432)
- Java class data 132864KB (malloced=132259KB #92498 in 20432 classes)
- Native memory tracking 1024KB (malloced=125KB #10)
in the HQ monitor console its showing as
JVM Memory
% Used:31Free:5.3 GBTotal Allocated:7.7 GBMax Allocation:7.7 GB
so its not tallying up 
It seems that you have 10 java processes. If HQ monitor is reporting the memory usage for a single JVM, you could run:
ps -opid,rss,vsz -p $(/sbin/pidof java)
... and there should be a pid, with VSZ of about 7.7. You should compare its RSS to what the HQ monitor shows.