[MPICH2-dev] help

[Brian R. Toonen]

I'm not an expert on MPD or mpiexec, but since our expert is out of town
I'll try to answer this.  mpiexec -help reports the following:

mpiexec [ -h   or  -help   or  --help ]
mpiexec -file filename  # where filename contains pre-built xml for mpdrun
mpiexec -configfile filename  # where filename contains cmd-line arg-sets
mpiexec -default defaultArgs -n <n> -host <h> -wdir <w> -path <p> cmd args :
more_arg_sets : ...
    other default arguments can be -l (line labels on stdout, stderr) and
    -setenvall (pass entire environment of mpiexec to all processes),
    -env KEY1=VALUE1 -env KEY2=VALUE2 ...
    defaultArgs are passed to all processes unless overridden
sample execution:
    mpiexec.py  -default -n 2 -wdir /bin -env RMB3=e3 : pwd : -wdir /tmp pwd
: printenv

So, to run the program on four explicitly specified hosts that are already
part of the MPD ring, you would need to do the following:

mpiexec -np 1 -host host1 cpi : -np 1 -host host2 cpi : \
        -np 1 -host host3 cpi : -np 1 -host host4 cpi

It would also seem that following is equivalent to the above:

mpiexec -default -np 1 : -host host1 cpi : -host host2 cpi : \
        -host host3 cpi : -host host4 cpi

However, the even shorter command below does not work and should not be
attempted with MPICH2 0.93 because it results in mpiexec producing an
endless loop of error messages (a bug that has already been reported to our
MPD developers):

mpiexec -default -np 1 cpi : -host host1 : -host host2 : \
        -host host3 : -host host4

I hope this helps.

--brian


> -----Original Message-----
> From: owner-mpich2-dev at mcs.anl.gov
> [mailto:owner-mpich2-dev at mcs.anl.gov]On Behalf Of chenyu
> Sent: Wednesday, April 23, 2003 22:01
> To: mpich2-dev at mcs.anl.gov
> Subject: [MPICH2-dev] help
>
>
> hi:
>   in mpich-1.2.x, we can use "mpirun -np 4 -machinefile filename
> cpi" to run mpi progs in different nodes. the only change is
> filename's content.
>   but how can i do the same thing in mpich2. we can not use
> commands "mpiexec -np 4 -machinefile filename cpi"
>   Who can help me?
>
>
>         chenyu
>         chenyu-tmlinux at hpclab.cs.tsinghua.edu.cn
>           2003-04-24
>
>