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Subject: Re: [OMPI users] MPI_Bcast from OpenMPI
From: shan axida (axida2009_at_[hidden])
Date: 2009-04-24 07:01:47


Thank You Eugene Loh, It is very important for me to explain the spike at figure! But I dont know how to hunt the reason and how to check it. Would you please help me in more practically? Thank you again. ________________________________ From: Eugene Loh <Eugene.Loh_at_[hidden]> To: Open MPI Users <users_at_[hidden]> Sent: Friday, April 24, 2009 2:16:22 PM Subject: Re: [OMPI users] MPI_Bcast from OpenMPI Right. So, baseline performance seems reasonable, but there is an odd spike that seems difficult to explain. This is annoying, but again: how important is it to resolve that mystery? You can spend a few days trying to hunt this down, only to find that it's some oddity that has no general relevence. I don't know if that's really the case, but I'm just suggesting that it may make most sense just to let this one go. shan axida wrote: But, exactly the same program gets different result in another cluster. I mean the result doent have any spike at all. Second cluster is almost the same features with the previous one From: Eugene Loh <Eugene.Loh_at_[hidden]> To: Open MPI Users <users_at_[hidden]> Sent: Friday, April 24, 2009 1:26:14 AM Subject: Re: [OMPI users] MPI_Bcast from OpenMPI So, the remaining mystery is the 6x or so spike at 128 Mbyte. Dunno. How important is it to resolve that mystery?