I am new at Openmpi : I used Lam so far and we have just installed OpenMpi.

When I run “mpirun –app schema” , OpenMpi complains about a missing daemon lamd, whereas the documentations says there is no need to run lamboot anymore.


To make sure :


$ which mpirun



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$ more schema

-np 1 -wd /Master/Path Master

-np 1 -wd /Slave1/Path ../Slave

-np 1 -wd /Slave2/Path ../Slave


$mpirun -app schema



It seems that there is no lamd running on the host paola20.


This indicates that the LAM/MPI runtime environment is not operating.

The LAM/MPI runtime environment is necessary for MPI programs to run

(the MPI program tired to invoke the "MPI_Init" function).


Please run the "lamboot" command the start the LAM/MPI runtime

environment.  See the LAM/MPI documentation for how to invoke

"lamboot" across multiple machines.



And, if I run ‘lamboot’, it works !


Would you know why ?