There are comments in the source code. See src/mpi/coll/barrier.c

Rajeev

On Jun 16, 2013, at 9:59 PM, pinak panigrahi wrote:

> Hi,
> I would like to know what algorithms are used for MPI_Barrier implementation in MPICH ... specifically, for intra-node MPI calls !
>
> --
> Pinak Panigrahi
> pursuing Masters in Computer Science
> at Sri Sathya Sai Institute Of Higher Learning,
> Puttaparti, India.
>
> "Thank God for what you have, Trust Him for what you need !"

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