Performance problem on multi-core system with multithreaded applications

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  Hello all,
    I have two different multi-threaded applications that when run _alone_ on 16-core Intel Xeon box with Linux, take 4 hours(app1) and 10 hours(app2) respectively. With MPI, I specify 8 threads for each of the application and fire them simultaneously.
  Now, when app1 gets completed, app2 runs with its 8 threads. I am wondering if it is possible to create more threads dynamically when you have resources lying idle? Here app2 just doesn't use remaining 8 cores, right?
  
  Please let me know if I am assuming something wrong.
  
  Thanks,
  Blue

  Thursday, May 28, 2009 6:59 AM