Hi Fabian,
On a separate topic, but related to your post here, how did you do the
timing? [Especially to so many digits of accuracy. :-) ]
I will have to time my program and I don't think /usr/bin/time would do
it. Are the numbers it report accurate [for an MPI program]? I think
the "us
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
lo
of Jeff Squyres
Sent: Mon 11/10/2008 1:14 PM
To: Open MPI Users
Subject: Re: [OMPI users] dual cores
There's also a great project at SourceForge called "htop" that is a
"better" version of top. It includes the ability to query for and set
processor affinity for ab
8 AM, Hodgess, Erin
wrote:
great!
Thanks,
Erin
Erin M. Hodgess, PhD
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: hodge...@uhd.edu
-Original Message-
From: users-boun...@open-mpi.org on behalf of Brock Palen
Sent: Sun 11
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> mailto: hodge...@uhd.edu
>
>
>
> -Original Message-
> From: users-boun...@open-mpi.org on behalf of Brock Palen
> Sent: Sun 11/9/2008 11:21 PM
> To: O
MPI Users
Subject: Re: [OMPI users] dual cores
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
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,
Sent: Sun 11/9/2008 11:20 PM
To: Open MPI Users
Subject: Re: [OMPI users] dual cores
Dear Erin,
I'm nowhere near a guru, so I hope you don't what I have to say (it
might be wrong...).
But what I did was just put a long loop into the program and while it
was running, I opened another
Dear Erin,
I'm nowhere near a guru, so I hope you don't what I have to say (it
might be wrong...).
But what I did was just put a long loop into the program and while it
was running, I opened another window and looked at the output of "top".
Obviously, without the loop, the program would te
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, wor
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