[Aces-support] Parallel tasks with mpiexec

[Tim Whitcomb]

Good Afternoon -

I'm attempting to run two parallel jobs in one PBS session (i.e. check 
out 7 nodes (ppn=2) and run 2 jobs on 7 processors apiece).

I try this, and get the following error:
-(log snip)-
Running COAMPS ensemble member 1
Running COAMPS ensemble member 2
mpiexec: Error: tasks_shmem_reduce: When using mpich/p4, the first task
must be on the same machine as mpiexec itself.  You ended up trying to
run task 0 on a54-1727-068, not a54-1727-074.
-(log snip)-

The mpiexec home page (http://www.osc.edu/~pw/mpiexec/index.php) states 
that as of release 0.81, mpiexec supports "concurrent parallel tasks." 
Is the version of mpiexec on the cluster older than this or am I missing 
something like a command-line option in the script?  Mpiexec is spawned 
thusly:
module load mpiexec
mpiexec -n ${NPROCS} ${COAMPS_BIN_DIR}/atmos_forecast.exe

This was job 59764 on ao, run at approx. 1630 today (4/16).

TRW

-- 
Timothy R. Whitcomb
===========================================
Research Assistant
Program on Atmospheres, Oceans, and Climate
Massachusetts Institute of Technology
office: Room 54-1611
         77 Massachusetts Avenue
	Cambridge, MA 02139
email:  ude_tim at mit.edu
===========================================