It is the total memory being used by Hyperic, its wrapper and any activity (discovery, getting metrics etc) as seen by sigar.
You can use the following sigar command to see this value:
Bring up sigar:
..\..\jre\bin\java.exe -jar sigar-126.96.36.199.jar
Once in sigar run the command below and you'll see the memory used by the agent.
sigar> ps "State.Name.eq=java,Args.24.ct=hyperic"
128mb is the JVM memory setting for the agent. The total memory used by the agent, its wrapper and discovery/monitoring processes will be higher.
egonzales thx very much for your reply and help.
Once you've got correct answer please update the post.