Hi Sree,
Run below command to see Introscope_Enterprise_Manager process in your SUSE platform.
ps -ef | grep java
If you have another java process running, this command will list those as well. But you should be able to find your enterprise manager process
You should be able to see APM home directory as well in process information. Navigate to home directory and go to 'bin' folder.
Run below command once you are in bin folder
./EMCtrl.sh stop
This will stop the collector. To start, run below command
./EMCtrl.sh start
Thanks,
Karthik