[mvapich-discuss] Dual FDR setup launches multiple instances of same process

[Dalai, Santak]

Hello,

I have a setup where I have two nodes, each having two FDRs. All FDRs are connected to an FDR switch. I am trying to run simple programs like osu_put_bibw. I observed that it is creating three instances of the same process. Has anyone observed similar behavior?
I wanted to understand why it's launching 3 instances. Can someone explain how a process is launched when we run using multiple HCAs?

I am using 'mpirun -n 2 -f mf1 -env MV2_NUM_HCAS=2 ~/mvapich2-2.0b/libexec/mvapich2/osu_put_bibw' command to launch the process.

Here is the snapshot of the top command
[cid:image002.png at 01CF36D5.1DB8FBB0]

If we notice one of one if the processes utilizes more CPU than others.

Thanks,
Santak Dalai

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