Run 'top' For long running applications you should see 4 processes
each at 50% (4*50=200% two cpus).
You are ok, your hello_c did what it should, each of thoese 'hello's
could have came from any of the two cpus.
Also if your only running on your local machine, you don't need a
hostfile, and -byslot is meaningless in this case,
mpirun -np 4 ./hello_c
Would work just fine.
Brock Palen
www.umich.edu/~brockp
Center for Advanced Computing
bro...@umich.edu
(734)936-1985
On Nov 10, 2008, at 12:05 AM, Hodgess, Erin wrote:
Dear Open MPI gurus:
I have just installed Open MPI this evening.
I have a dual core laptop and I would like to have both cores running.
Here is the following my-hosts file:
localhost slots=2
and here is the command and output:
mpirun --hostfile my-hosts -np 4 --byslot hello_c |sort
Hello, world, I am 0 of 4
Hello, world, I am 1 of 4
Hello, world, I am 2 of 4
Hello, world, I am 3 of 4
hodgesse@erinstoy:~/Desktop/openmpi-1.2.8/examples>
How do I know if both cores are running, please?
thanks,
Erin
Erin M. Hodgess, PhD
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: hodge...@uhd.edu
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