MPIR_BCAST_BLOCK_SIZE is not defined by the MPI standard; it
sounds
like an implementation-specific detail. Judging by the
name, I'd
guess that this value has something to do with the MPICH /
MPICH2
family of MPI implementations (not LAM/MPI).
LAM does not allow you to change much about the underlying
implementation of its collectives (such as bcast).
On Feb 5, 2008, at 1:56 AM, Rayne wrote:
> Hi all,
> I've read that "MPIR_BCAST_BLOCK_SIZE determines
the
> size of blocks" in MPI_Bcast. So what is the
default
> value of MPIR_BCAST_BLOCK_SIZE and how do I change it?
>
>
> Thank you.
>
> Regards,
> Rayne
>
>
>
>
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Jeff Squyres
Cisco Systems
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