If you build MPICH 3.1.4 with the option "--with-namepublisher=file", it will use the same method as previous versions. Ken On 09/21/2015 09:36 AM, PEDRONO Annaig wrote:

Hello,

I am using MPI Client/Server features to couple 2 codes. You can find a short example in attached file. In the Makefile, mpif90 is the wrapper for mpich compiled with gfortran.

With mpich2, I manage to run a client/server case without any problem with the following script :

mpirun -np 1 ./Serveur > Serveur.log & sleep 5 mpirun -np 1 ./Client > gradym_client.log

and I am able to run many coupled simulations on the same computer.

With mpich3, the script above doesn't work any more. I have found another way to run my coupled case in the mpich3 manual :

#/bin/csh set hydraPID=`ps -u $USER | grep hydra_nameserve | cut -d ' ' -f 1` kill -9 $hydraPID

/PRODCOM/Ubuntu12.04/hydra/3.1.4/intel-15.0/bin/hydra_nameserver &

mpiexec -hosts `hostname` -n 1 -nameserver `hostname` ./Serveur &

sleep 1

mpiexec -hosts `hostname` -n 1 -nameserver `hostname` ./Client

set hydraPID=`ps -u $USER | grep hydra_nameserve | cut -d ' ' -f 1` echo $hydraPID kill -9 $hydraPID

It is more complicated and I can only run one simulation by computer at the same time because I can launch only one hydra server. Do you know another way to run client/server simulation with mpich3? What can I do to run many client server simulation on the same host?

Thanks a lot for your help.

A. Pedrono

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