[Pw_forum] Parallel on QuadCore

[Carlo Nervi]

Nay Lin ha scritto:
> Dear users,
>  
> i compiled mpi version pwscf 4.1.2 on quad core. with ubuntu linux
> ./pw.x shows "Parallel Version (MPI)". 
> In make.sys, DFLAGS contains -D__MPI and -D_PARA.
> I have mpirun installed.
>  
> may i know what is the complete  mpirun command to initiate the 
> calculation. 
> when i run
> mpirun -np 2 ../../bin/pw.x<si.scf.in <http://si.scf.in>>si.scf.out
> i get error such as
> It seems that [at least] one of the processes that was started with
>   mpirun did not invoke MPI_INIT before quitting (it is possible that
>   more than one process did not invoke MPI_INIT -- mpirun was only
>   notified of the first one, which was on node n0). 
>  

This looks like a problem in running/compiling with mpi (open mpi?). Try 
first to compile a simple mpi program and run it with the mpirun 
command. Does it works?
	Carlo

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