[GE users] ge6 mpi job startup trouble

Reuti reuti at staff.uni-marburg.de
Tue Nov 2 23:19:55 GMT 2004

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Hi again,

> host1.domain.org 0 test_mpich
> host2 1 test_mpich
> host3 1 test_mpich
> host4 1 test_mpich
> host5 1 test_mpich
> host6 1 test_mpich
> host7 1 test_mpich
> host2 1 test_mpich

what's in /etc/hosts? We set only the hostname without any domain and it's 
working this way for us.

MPICH does the following: use the `hostname` and skip one of these entries 
during the first scan of the machinefile. What is `hostname` on host1? It seems 
to be completely skipped during the further scan (hence gives you a second 

If necessary, you can also tell MPICH that it's running on node1 (without the 
domain) by inserting one line at the beginning of mpich.args like:

MPI_HOST=`hostname | sed "s/.domain.org//"`

Cheers - Reuti

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