I have seen this reported twice now I think from two different sources,
but I could be incorrect. Unfortunately, we don¹t have access to an AIX
cluster to investigate the problem. We don¹t see it on any other platform at
Could you tell me something more about your cluster? In particular, it would
help to know your launch environment (e.g., rsh/ssh, SLURM, TM, etc.). The
noted behavior of using debug-daemons to resolve the problem has me puzzled
as that flag only causes the daemons to keep their stdio ports open it has
nothing to do with the application processes nor the I/O forwarding
I can suggest a couple of options in the interim, though I don¹t know that
they will solve the problem:
1. You could upgrade to the 1.2 beta release. The runtime underwent some
significant changes that might help here; or
2. You could try configuring Open MPI with ³--disable-pty-support². The I/O
forwarding system is currently based upon pty¹s. We have seen a problem on
one other platform where the pty support wasn¹t quite what Open MPI expects
disabling it solved the problem. You should first check if the 1.1.2
release supports this configuration option (I honestly can¹t remember it
has been too long) - you may need to upgrade to 1.2 to do this.
I hope that provides some help. If/when we get access to an AIX cluster,
we¹ll try to dig deeper into this issue.
On 12/22/06 7:44 AM, "Ali Eghlima" <Ali_Eghlima_at_[hidden]> wrote:
> We have Open MPI 1.1.2 installed on IBM AIX 5.3 cluster. It looks like
> terminal output is broken. There are a few entry in the archive for this
> with no suggested solution or real work around.
> I am putting this posting with hope to get some advise for a work around or
> #mpirun -np 1 hostname
> No out put, piping the command to "cat" or "more" generate no out put
> as well.
> The only way to get an output from this command is to add
> #mpirun -np 1 --debug-daemons hostname
> Even this debug option is not working for a real application which generate
> several output.
> Looking forward for any comments.
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