Hi Erin,
> 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
Be warned that at least in default config running more MPI threads than
you have cores results in dog slow code.
Single core machine:
$ cat my-hosts
localhost slots=1
$ mpirun -np 1 -hostfile my-hosts ./sort selectionsort 1024
1024 0.009905000seconds
$ mpirun -np 2 -hostfile my-hosts ./sort selectionsort 1024
1024 4.113605000 seconds
(on dual core both -np 1 and -np 2 run almost equally fast (only
slightly speedup due to poor algorithm (developed for demonstration
purposes))
Best regards
Fabian
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