[Beowulf] MPI community

[Reuti]

Kevin,

Quoting "Cheng, Kevin " <kc40 at hw.ac.uk>:

> Hi there
> 
> Am new to the mailing list and wondering what we can talk about? I have been
> trying to find MPI-CH or MPI help/forums/community but couldn't find any.
> 
> 1. Is it possible to set up MPICH-1 or MPICH-2 on a single machine and trick
> it to emulate 2 hosts? Basically developing on a single machine but doing
> MPI_Send, MPI_Gather calls.

Yes, this is already built-in. Just start mpirun with "-np 2" or a similar 
request with mpiexec for MPICH2, and use a local rsh/ssh.

> 
> 2. Is it possible to have two hosts, one Windows MPI-CH, and one Linux
> MPI-CH, to work together?
> 

Then you would need also need different binaries for the program for each 
platform. This is not a straight forward setup, also if you have Linux on two 
different platforms. But MPICH will convert the transferred values, between 
different processor architectures.

> 3. Is it possible to have MPI-CH-1 and MPI-CH-2 work together on separate
> hosts?

No. What should happen, if one node requests a MPI-2 operation, when the other 
node doesn't know anything about MPI-2?

There is a MPICH list:

http://www-unix.mcs.anl.gov/mpi/mpich2/maillist.htm

Cheers - Reuti