[mvapich-discuss] Broadcast using infiniband's hardware multicast

[Dhabaleswar Panda]

Hi,

Thanks for your note. Several years back. the hardware multicast-based
approach was not scalable for collectives, compared to multi-core-based
approach. That's why this design from MVAPICH was not carried out to
MVAPICH2. Instead, multi-core-based approach was stressed in the MVAPICH2
series.

Hope this helps.

Thanks,

DK

On Wed, 14 Mar 2012, NARDI Luigi wrote:

> Hello,
>
> I'm interested in using the MPI-level broadcast using infiniband's
> hardware multicast functionality with MVAPICH2.
>
> I have seen nice results in some papers of years 2005 and 2006.
>
> May I know what is the implementation state of the art on this work?
>
> I have seen that MVAPICH 0.9.9 User and Tuning Guide
> (https://computing.llnl.gov/tutorials/linux_clusters/mvapich_user_guide_
> 099.pdf
> <https://computing.llnl.gov/tutorials/linux_clusters/mvapich_user_guide_
> 099.pdf> ) in 2007 talks about this functionality
>
> but nothing is said about that on MVAPICH2 1.8 User Guide
> (http://mvapich.cse.ohio-state.edu/support/mvapich2-1.8_alpha2_user_guid
> e.pdf
> <http://mvapich.cse.ohio-state.edu/support/mvapich2-1.8_alpha2_user_guid
> e.pdf> ) in 2012.
>
> Thanks in advance
>
> Luigi Nardi
>
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