Guanhua,
The error message could be the result of a few things. Here is a short
list of items to check:
1. lamboot should not be causing this problem, but it is good to make
sure that everything booted properly. You can see lamboot's progress
with 'lamboot -v', then 'lamnodes' will let you see the nodes that have
been booted.
2. Make sure that your environment is set properly, and pointing to the
correct binaries of LAM/MPI. If you have a couple of installations (say
an RPM'ed image from RH, and a self installation in $HOME/local) then
you will want to put the installation of the version you want to use
first in your path (e.g. export PATH=$HOME/local/bin/;$PATH).
3. Make sure you compiled your MPI program with the version of
'mpicc/mpic++/mpif77' corresponding to the 'mpirun' command that you
used. ('which mpicc', 'which mpirun')
4. Check your code looking for places where the program may have exited
before calling MPI_Init() (per the error message). It is suggested that
you call MPI_Init as early as possible in your MPI program.
Give some of those a try, and let me know if that helps.
Josh
On Mar 28, 2005, at 6:57 PM, Guanhua Yan wrote:
> Hi all,
>
> I met some strange problems when using LAM. Hope some experienced
> people can
> give me a hand.
>
> A month ago, I used LAM on my laptop successfully. Later, I was
> interrupted by
> something else. And yesterday, when I resumed to work on my
> parallelization
> code, something fishy happened:
>
> The code that is executable before does not work now. When I tried to
> use
> "mpirun -np 1 <executable>", I always had the following printouts:
>
> -----------------------------------------------------------------------
> ------
> It seems that [at least] one of the processes that was started with
> mpirun did not invoke MPI_INIT before quitting (it is possible that
> more than one process did not invoke MPI_INIT -- mpirun was only
> notified of the first one, which was on node n0).
>
> mpirun can *only* be used with MPI programs (i.e., programs that
> invoke MPI_INIT and MPI_FINALIZE). You can use the "lamexec" program
> to run non-MPI programs over the lambooted nodes.
> -----------------------------------------------------------------------
> ------
>
> I am pretty sure that "lamboot" is successfully done. And the LAM
> version is
> 7.0.6. And the gcc version is "3.2.2". I did observe "gcc: invalid
> version
> number format" in the configuration log. but I am not sure whether
> this is
> the real reason.
>
> thanks,
> Guanhua
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
----
Josh Hursey
jjhursey_at_[hidden]
http://www.lam-mpi.org/
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