[mvapich-discuss] Trace MPI traffic

[Hari Subramoni]

Hello Srikanth,

Could you please let us know how you've configured MVAPICH2? The output of
mpiname -a will help.

If you've configured MVAPICH2 in the default fashion (i.e to use
InfiniBand), then the output of any MPI program with the environment
variable MV2_SHOW_ENV_INFO set to 1 will give you the type of IB HCA being
used by MVAPICH2 (mpirun_rsh ... MV2_SHOW_ENV_INFO=1 ...).

Regards,
Hari.

On Thu, Dec 11, 2014 at 1:44 AM, Srikanth Gumma <sri4mailing at gmail.com>
wrote:
>
> Hi,
>
> I'm curious to know if I'm executing an application with mpirun command,
> whether I can monitor the MPI traffic? Is there a way that I can identify
> which interface from my server is being used for the MPI traffic?
>
> In the older version of MPI, I remember we used the different interface
> names for different interfaces and execute mpi, so we could identify that
> the mpi traffic is going through a particular interfac. but the newer
> version MVAPICH2 after integration of hydra process manager, we provide
> only the host name and as I understand MVAPICH will decide the fastest
> interface available and communicates with that interface. So in this case
> can I identify which interface is being used by my MPI application?
>
> Thanks in advance for any clarifications.
>
> Regards
> Srikanth.
>
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