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Subject: Re: [OMPI users] top command output shows huge CPU utilization when openmpi processes resume after the checkpoint
From: Addepalli, Srirangam V (srirangam.v.addepalli_at_[hidden])
Date: 2010-03-21 12:58:56


Yes We have seen this behavior too.

>>Another behavior I have seen is that one MPI process starts to show different elapsed time than its peers. Is it because checkpoint happened on behalf of this process?

R
________________________________________
From: users-bounces_at_[hidden] [users-bounces_at_[hidden]] On Behalf Of ananda.mudar_at_[hidden] [ananda.mudar_at_[hidden]]
Sent: Saturday, March 20, 2010 10:18 PM
To: users_at_[hidden]
Subject: [OMPI users] top command output shows huge CPU utilization when openmpi processes resume after the checkpoint

When I checkpoint my openmpi application using ompi_checkpoint, I see that top command suddenly shows some really huge numbers in "CPU %" field such as 150% 200% etc. After sometime, these numbers do come back to the normal numbers under 100%. This happens exactly around the time checkpoint is completed and when the processes are resuming the execution.

Another behavior I have seen is that one MPI process starts to show different elapsed time than its peers. Is it because checkpoint happened on behalf of this process?

For your reference, I am using open mpi 1.3.4 and BLCR 0.8.2 for checkpointing.

Thanks
Anand

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