[mvapich-discuss] is something else turned off by VIADEV_USE_SHMEM_COLL=0 ?

[Dhabaleswar Panda]

> I have an application that runs okay with the following command line
> using mvapich-1.1rc1 (disabling the SHMEM collectives is necessary to
> get it to run).
>
> runs;
> mpirun_rsh -ssh -np $NPES -hostfile machinefile VIADEV_USE_SHMEM_COLL=0
> ./Application
>
> however if I disable each collective individually on a single command
> line, it fails in the same manner as when the collectives are defaulted.
>
> e.g.
> mpirun_rsh -ssh -np $NPES -hostfile machinefile
> VIADEV_USE_SHMEM_ALLREDUCE=0 VIADEV_USE_SHMEM_REDUCE=0
> VIADEV_USE_SHMEM_BARRIER=0 VIADEV_USE_SHMEM_BCAST=0
> VIADEV_USE_NEW_ALLGATHER=0 ./Application
>
> fails just like ...
> mpirun_rsh -ssh -np $NPES -hostfile machinefile ./Application
>
> Does setting VIADEV_USE_SHMEM_COLL=0 disable more code paths than
> indicated in the documentation?

The design and use of shmem_based_collectives requires modifications to
the way communicators are created and handled. There are some parts
related to this communicator creation/handling which could be the cause of
these differences. We will take a look at it.

Thanks,

DK

> Sec 5.4 of
> http://mvapich.cse.ohio-state.edu/support/mvapich_user_guide-1.1.pdf
>
> --
> Dan Kokron
>
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