Thanks all. It is now cleared.
Regards,
Mahmood
From: Damien
To: Open MPI Users
Sent: Saturday, October 27, 2012 7:25 PM
Subject: Re: [OMPI users] openmpi shared memory feature
Mahmood,
To build on what Jeff said, here's a short summary of how diskless c
Mahmood,
To build on what Jeff said, here's a short summary of how diskless
clusters work:
A diskless node gets its operating system through a physical network
(say gig-E), including the HPC applications and the MPI runtimes, from a
master server. That master server isn't the MPI head node,
On Oct 27, 2012, at 12:47 PM, Mahmood Naderan wrote:
> >Because communicating through shared memory when sending messages between
> >processes on the same server is far faster than going through a network
> >stack.
>
> I see... But that is not good for diskless clusters. Am I right? assume
>
On Oct 27, 2012, at 9:47 AM, Mahmood Naderan wrote:
>
> >Because communicating through shared memory when sending messages between
> >processes on the same server is far faster than going through a network
> >stack.
>
> I see... But that is not good for diskless clusters. Am I right?
No, t
>Because communicating through shared memory when sending messages
between processes on the same server is far faster than going through a
network stack.
I see... But that is not good for diskless clusters. Am I right? assume
processes are on a node (which has no disk). In this case, their co
oops...
Sorry about that.
Regards,
Mahmood
From: Jeff Squyres
To: Mahmood Naderan ; Open MPI Users
Sent: Saturday, October 27, 2012 6:34 PM
Subject: Re: [OMPI users] open mpi 1.6 with intel compilers
I believe you're referring to a different thread on th
I believe you're referring to a different thread on this mailing list:
http://www.open-mpi.org/community/lists/users/2012/10/20552.php
I answered the question about shared memory in that thread, not this one (which
is about a run-time error).
On Oct 27, 2012, at 12:24 PM, Mahmood Naderan w
>This looks like you're trying to execute an MPICH2-build MPI executable, not
>Open MPI.
No that was a general question. I mean message passing is a model of
communication
versus shared memory programming. So what is the point when openmpi uses shared
memory model?
Regards,
Mahmood
__
The reason is that you aren't actually running Open MPI - those error messages
are coming from MPICH. Check your path and ensure you put the OMPI install
location first, or use the absolute path to the OMPI mpirun
On Oct 27, 2012, at 8:46 AM, Giuseppe P. wrote:
> Hello!
>
> I have built open
On Oct 27, 2012, at 10:49 AM, Mahmood Naderan wrote:
> Why openmpi uses shared memory model?
Because communicating through shared memory when sending messages between
processes on the same server is far faster than going through a network stack.
> this can be disabled though by setting "--mca ^
This looks like you're trying to execute an MPICH2-build MPI executable, not
Open MPI.
On Oct 27, 2012, at 11:46 AM, Giuseppe P. wrote:
> Hello!
>
> I have built open mpi 1.6 with Intel compilers (2013 versions). Compilation
> was smooth, however even when I try to execute
> the simple program
Hello!
I have built open mpi 1.6 with Intel compilers (2013 versions). Compilation
was smooth, however even when I try to execute
the simple program hello.c:
mpirun -np 4 ./hello_c.x
[mpie...@claudio.ukzn] HYDU_create_process (./utils/launch/launch.c:102):
execvp error on file
/opt/intel/composer
Dear all,
Why openmpi uses shared memory model? this can be disabled though by setting
"--mca ^sm".
It seems that by default openmpi uses such feature (shared memory backing
files) which is strange.
Regards,
Mahmood
13 matches
Mail list logo
