K. Gutierrez)
>
>
> ------
>
> Message: 1
> Date: Mon, 19 Sep 2011 13:13:08 -0400
> From: Gus Correa <g...@ldeo.columbia.edu>
> Subject: Re: [OMPI users] RE : MPI hangs on multiple nodes
> To: Open
.
But that's not what hangs your program.
Gus Correa
Message: 11
Date: Mon, 19 Sep 2011 10:37:02 -0400
From: Gus Correa <g...@ldeo.columbia.edu <mailto:g...@ldeo.columbia.edu>>
Subject: Re: [OMPI users] RE : MPI hangs on multiple nodes
To: Open MPI Users <us...@open-mpi.org <
>> 1: After a reboot of two nodes I ran again, and the inter-node freeze didn't
>happen until the third iteration. I take that to mean that the basic
>communication works, but that something is saturating. Is there some notion
>of buffer size somewhere in the MPI system that could explain this?
>
On Sep 19, 2011, at 10:23 PM, Ole Nielsen wrote:
> Hi all - and sorry for the multiple postings, but I have more information.
+1 on Eugene's comments. The test program looks fine to me.
FWIW, you don't need -lmpi to compile your program; OMPI's wrapper compiler
allows you to just:
mpicc
Hi all - and sorry for the multiple postings, but I have more information.
1: After a reboot of two nodes I ran again, and the inter-node freeze didn't
happen until the third iteration. I take that to mean that the basic
communication works, but that something is saturating. Is there some notion
works fine on other installations and indeed when run on one
the cores of one Node.
Message: 11
List-Post: users@lists.open-mpi.org
Date: Mon, 19 Sep 2011 10:37:02 -0400
From: Gus Correa <g...@ldeo.columbia.edu>
Subject: Re: [OMPI users] RE : MPI hangs on multiple nodes
To: Open MPI Use
./mpi_test
So, maybe this helps you.
Best,
Devendra Rai
From: Ole Nielsen <ole.moller.niel...@gmail.com>
To: us...@open-mpi.org
Sent: Monday, 19 September 2011, 10:59
Subject: [OMPI users] MPI hangs on multiple nodes
The test program is available here
The test program is available here:
http://code.google.com/p/pypar/source/browse/source/mpi_test.c
Hopefully, someone can help us troubleshoot why communications stop when
multiple nodes are involved and CPU usage goes to 100% for as long as we
leave the program running.
Many thanks
Ole Nielsen
Further to the posting below, I can report that the test program (attached -
this time correctly) is chewing up CPU time on both compute nodes for as
long as I care to let it continue.
It would appear that MPI_Receive which is the next command after the print
statements in the test program.
Has
Hi all
We have been using OpenMPI for many years with Ubuntu on our 20-node
cluster. Each node has 2 quad cores, so we usually run up to 8 processes on
each node up to a maximum of 160 processes.
However, we just upgraded the cluster to Ubuntu 11.04 with Open MPI 1.4.3
and and have come across a
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