how to get each task's process?

Tue, 29 Mar 2011 07:53:38 -0700 

hi,guys:
       I want to monitor each tasks' io usage, do can I get each task's process 
id?
       I used  jvmManager.getPid(tip.getTaskRunner()); but it didn't seem to be 
the task's process.
       Thanks
                                                                                
                 zhutao

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