Can you give a concrete example of this?
Do you have a lot of stdout from the processes running on the nodes, or
just a little output (and then program termination)?
If it's just a little output, you might want to put explicit fflush()
statements in your application (I'm assuming that this is a C
application?).
On Jun 23, 2005, at 11:17 PM, Craig Lam wrote:
> Hello,
>
> I've set up a diskless cluster running Fedora Core 3 (modified to
> allow the diskless cluster nodes to start up). When I run an MPI job,
> it seems that stdout does not get directed from remote nodes correctly
> although all local processes' output shows up correctly. Does anyone
> know why this might be?
>
> My system set up is an 8 node dual opteron cluster running in 32-bit
> mode on Linux. Each node has dual infiniband over PCI express
> (although I am only using one interface currently). My configuration
> of MPI is done with "./configure --with-debug --prefix=/opt/lam-7.0.6
> --exec-prefix=/opt/lam-7.0.6 --with-rsh=ssh". The problem exhibits
> itself on both Lam-7.0.6 and Lam-7.1.1 (I have not tried other
> version). My diskless clusters run NFS version 4, and each cluster
> node binds /var/${HOSTNAME}/ to /var and /tmp/${HOSTNAME} to /tmp to
> give each node an individual copy of these directories (would this
> contribute to these problems?)
>
> I must admit that I am a bit stumped.
>
> Thanks for all your thoughts,
> Craig Casey
> craig.mpi_at_[hidden]
>
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--
{+} Jeff Squyres
{+} jsquyres_at_[hidden]
{+} http://www.lam-mpi.org/
|
