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Subject: Re: [OMPI devel] Question about hanging mpirun
From: Ralph Castain (rhc_at_[hidden])
Date: 2011-07-01 15:49:54

Make sure your LD_LIBRARY_PATH will pickup this installation before anything else - it's possible it is picking up an old one.

I take it that you are running this on a single machine? So all the procs are local?

Only other issue is that OMPI's configure does a lot of testing to detect the local environment. So you might be building support for things that aren't on your target machine, and vice versa. If you have to do it this way, you need to ensure that the two machines are absolutely identical, both in hardware and software (watch for those installed packages!).

On Jul 1, 2011, at 10:42 AM, Colon, Joseanibal wrote:

> My mpi application is hanging forever when called with mpirun –np >1 (that is 2 or more... not actually typing the ‘>’).
> So I built openmpi 1.4.3 with default options except I used –prefix=/usr/local/openmpi. I compiled an application against it but I need to run this application elsewhere. So brought in my entire installation directory /usr/local/openmpi to this new machine along with my binary to test it. Ran the following command... (If i did’t use the –mca options it would print out messages about missing OpenFrabric):
> /usr/local/openmpi/bin/mpirun --mca btl tcp,self -np 2 ./my_application
> This actually works for –np 1. But requesting another process makes the call hang forever. ‘strace’ of the above call shows an never ending calls to “poll” resulting in (timeout) every time.
> Executing /usr/local/openmpi/bin/ompi_info still shows the configure and build host as the machine I built on, but I don’t know if this may cause a problem. I also see “Thread support: posix (mpi: no, progress: no)”
> Unfortunately I need to do it this way.. I cannot build openmpi on the target machine, so I need to make it portable. This other machine should be the same architecture and OS and everything.
> I should have solved this yesterday, please help, and thanks!
> -Joseanibal
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