Hi,
Am 08.04.2008 um 12:04 schrieb yacob sen:
Thank you Brock and Terry for your comments. I did now install
manually openmpi. Now openmpi works
properly. I can compile and run my programs.It is so wonderful now.
The result is now the same as when
I run it in Linux cluster and on my dual processor Laptop.
When I run : mpirun -np 4 ./test (test being the exe file coming
form my the compiled fortran program).
The program still give a result based on 4 processor. How can this
be true while I have only two processor
in my laptop.
the Linux scheduler will just run these 4 processes as it would run
every other set of 4 processes, i.e. each one will get 50% of a core,
and you should see it in "top". It will of course not run faster, but
you can test whether your programm runs correct when using 4 or more
tasks.
-- Reuti
Can any one comment on this ?
Regards
yacob
----- Original Message ----
From: yacob sen <yacob_...@yahoo.com>
To: us...@open-mpi.org
Sent: Monday, April 7, 2008 5:08:39 PM
Subject: An error occurred in MPI_comm_size
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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