Your probably pulling in mpich's  mpif.h  or using mpich's mpirun.  

Chose ether OpenMPI or MPICH,  not both,  or if you do install in their own locations.  They share way to many file names and commands to install both in standard /usr/local  locations.

Brock Palen
www.umich.edu/~brockp
Center for Advanced Computing
brockp@umich.edu
(734)936-1985



On Apr 7, 2008, at 12:08 PM, yacob sen wrote:


Dear All,

I have just installed openmpi/mpich in ubuntu 7.10 in my linux machine which has  a dual processor.

I compiled my fortran program as follows:

mpif90  add.f90 -o add_n

I, however, forced to copy "mpif.h" library in my working directory where i run my program and also I  inserted an additional line inside the file "/etc/openmpi/openmpi-mca-params.conf", the following : btl=^openib.


I have then run the program as:

mpirun -np 2 ./add_n  (here I use 2 processor as my dual laptop has two processor)

What I got is the following error message :

[geosl063:13781] *** An error occurred in MPI_comm_size
[geosl063:13780] *** An error occurred in MPI_comm_size
[geosl063:13780] *** on communicator MPI_COMM_WORLD
[geosl063:13780] *** MPI_ERR_COMM: invalid communicator
[geosl063:13780] *** MPI_ERRORS_ARE_FATAL (goodbye)
[geosl063:13781] *** on communicator MPI_COMM_WORLD
[geosl063:13781] *** MPI_ERR_COMM: invalid communicator


I used  MPI commands to program my fortran code. The program has been running in a linux cluster. The point here is to develop my parallel program in my linux laptop before I go and run it in a Linux cluster.

Any comments. I appreciate any comments

Thank you so much


Yacob



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