[mvapich-discuss] MVAPICH2 and hardware multicast for MPI_Bcast

[Matthew Koop]

Verdi,

MVAPICH2 does not currently support the hardware multicast. It instead it
supports shared memory collective implementations that in practice we have
found perform quite well.

Thanks,
Matt

On Tue, 9 Dec 2008, Verdi March wrote:

> Hi,
>
> does MVAPICH2 support hardware multicast for MPI_Bcast?
>
> I don't see the MCST_* flag in its build scripts, nor does any
> indication in its source code.
>
> At least, I could find in MVAPICH's source that mcast is supported.
>
> Or, does MVAPICH2 automatically use multicast without a need to
> explictly set any built/run-time flag?
>
> Your clarification is appreciated.
>
> Regards,
> Verdi
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