[Pw_forum] OpenMPI on mac

[Riccardo Sabatini]

Hi everyone,

     i'm starting in these days to setup a little cluster (well, just  
two intel mac dual
core, osx 10.5.2) to learn how parallel processing works. I'm working  
with the espresso
version 4.0 and i have Intel Fortran compiler (v10) and gcc from the  
developers tools
(xcode 2.5, gcc 4.01) on both the machines.

     I downloaded and compiled OpenMPI and i'm pretty sure it works  
fine on both computer
(i tried with a very simple program from the openmpi website). Now i  
tried to compile QE
with all the wrappers (mpif90, mpicc, mpicxx, mpif77) in the make.sys,  
at least that's
what the openmpi suggests to do in their FAQ. The compilation runs  
perfectly but when i
try to run a simple simulation the programs fails with this error message

*** An error occurred in MPI_Comm_f2c
*** before MPI was initialized
*** MPI_ERRORS_ARE_FATAL (goodbye)
[rikis-macbook.local:56606] Abort before MPI_INIT completed  
successfully; not able to
guarantee that all other processes were killed!

     The command i use is

     mpirun -np 2 $PWROOT/bin/pw.x < si.scf.in

     and i run it on just one mac (my laptop). To be precise i can see  
two times the
error, as if both the processes break for the same problem. I  
understood the problem is
the fortran-c handler but i really have no idea how to fix this. I  
haven't worked yet on
the real cluster but i think if it's not working with the dual core  
alone no hope with
the rest....

     Waiting for your news, thanks a lot for the help. Kind regards,

                 Riccardo

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