Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] Processes always rank 0
From: Oliver Stolpe (oliver.stolpe_at_[hidden])
Date: 2010-07-08 07:13:43


I thought this is OpenMPI what I was using. I do not have permission to
install something, only in my home directory. All tutorials I found
started the environment with the lamboot command. Whats the difference
using only OpenMPI?

$ whereis openmpi
openmpi: /etc/openmpi /usr/lib/openmpi /usr/lib64/openmpi /usr/share/openmpi

$ echo $LD_LIBRARY_PATH
:/usr/lib/openmpi/lib:/usr/lib64/openmpi/lib:

$ whereis mpirun
mpirun: /usr/bin/mpirun.mpich /usr/bin/mpirun /usr/bin/mpirun.lam
/usr/bin/mpirun.openmpi

$ ll /usr/bin/mpirun
lrwxrwxrwx 1 root root 24 14. Aug 2008 /usr/bin/mpirun -> /usr/bin/orterun

$ ll /usr/bin/orterun
-rwxr-xr-x 1 root root 39280 25. Aug 2008 /usr/bin/orterun

$ ll /usr/bin/mpirun.openmpi
lrwxrwxrwx 1 root root 7 5. Sep 2008 /usr/bin/mpirun.openmpi -> orterun

When I run mpirun without starting the environment by using lamboot, it
says:

ocs_at_frost:~$ mpicc -o mpitest mpitest.c && mpirun -np 1 -machinefile
machines ./mpitest
-----------------------------------------------------------------------------

It seems that there is no lamd running on the host frost.

This indicates that the LAM/MPI runtime environment is not operating.
The LAM/MPI runtime environment is necessary for MPI programs to run
(the MPI program tired to invoke the "MPI_Init" function).

Please run the "lamboot" command the start the LAM/MPI runtime
environment. See the LAM/MPI documentation for how to invoke
"lamboot" across multiple machines.
-----------------------------------------------------------------------------

Thanks in advance,
Oliver

Jeff Squyres wrote:
> If you're just starting with MPI, is there any chance you can upgrade to Open MPI instead of LAM/MPI? All of the LAM/MPI developers moved to Open MPI years ago.
> ann/lib:/home/bude/ocs/fann
>
> On Jul 8, 2010, at 6:01 AM, Oliver Stolpe wrote:
>
>
>> Hello there,
>>
>> I have a problem setting up MPI/LAM. Here we go:
>>
>> I start lam with the lamboot command successfully:
>>
>> $ lamboot -v hostnames
>>
>> LAM 7.1.2/MPI 2 C++/ROMIO - Indiana University
>>
>> n-1<11960> ssi:boot:base:linear: booting n0 (frost)
>> n-1<11960> ssi:boot:base:linear: booting n1 (hurricane)
>> n-1<11960> ssi:boot:base:linear: booting n2 (hail)
>> n-1<11960> ssi:boot:base:linear: booting n3 (fog)
>> n-1<11960> ssi:boot:base:linear: booting n4 (rain)
>> n-1<11960> ssi:boot:base:linear: booting n5 (thunder)
>> n-1<11960> ssi:boot:base:linear: finished
>>
>> Ok, all is fine. I test a command (hostname in this case):
>>
>> $ mpirun -v --hostfile hostnames hostname
>> thunder
>> rain
>> frost
>> fog
>> hurricane
>> hail
>>
>> Works. I write a hello world program for testing:
>>
>> #include <mpi.h>
>> #include <stdio.h>
>>
>> int main(int argc, char** argv) {
>> unsigned int rank;
>> unsigned int size;
>> MPI_Init(&argc, &argv);
>>
>> MPI_Comm_rank(MPI_COMM_WORLD, &rank);
>> MPI_Comm_size(MPI_COMM_WORLD, &size);
>>
>> printf("Hello, World. I am %u of %u\n", rank, size);
>>
>> MPI_Finalize();
>> return 0;
>> }
>>
>> I compile and run it:
>>
>> $ mpicc -o mpitest mpitest.c && mpirun -v --hostfile hostnames ./mpitest
>> Hello, World. I am 0 of 1
>> Hello, World. I am 0 of 1
>> Hello, World. I am 0 of 1
>> Hello, World. I am 0 of 1
>> Hello, World. I am 0 of 1
>> Hello, World. I am 0 of 1
>>
>> And I don't get it why everyone has the rank 0 and the size is only 1. I
>> followed many tutorials and i proved it right many times. Does anyone
>> has an idea?
>>
>> Thanks in advance!
>>
>> Oliver
>>
>> Some infos:
>>
>> $ lamboot -v
>>
>> LAM 7.1.2/MPI 2 C++/ROMIO - Indiana University
>>
>> n-1<12088> ssi:boot:base:linear: booting n0 (localhost)
>> n-1<12088> ssi:boot:base:linear: finished
>> ocs_at_frost:~$ lamboot -V
>>
>> LAM 7.1.2/MPI 2 C++/ROMIO - Indiana University
>>
>> Arch: x86_64-pc-linux-gnu
>> Prefix: /usr/lib/lam
>> Configured by: buildd
>> Configured on: Sun Apr 6 01:43:15 UTC 2008
>> Configure host: excelsior
>> SSI rpi: crtcp lamd sysv tcp usysv
>>
>> $ mpirun -V
>> mpirun (Open MPI) 1.2.7rc2
>>
>> Report bugs to http://www.open-mpi.org/community/help/
>>
>> $ mpicc -v
>> Using built-in specs.
>> Target: x86_64-linux-gnu
>> Configured with: ../src/configure -v --with-pkgversion='Debian
>> 4.3.2-1.1' --with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs
>> --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
>> --enable-shared --with-system-zlib --libexecdir=/usr/lib
>> --without-included-gettext --enable-threads=posix --enable-nls
>> --with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3
>> --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
>> --enable-mpfr --enable-cld --enable-checking=release
>> --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
>> Thread model: posix
>> gcc version 4.3.2 (Debian 4.3.2-1.1)
>> _______________________________________________
>> users mailing list
>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
>>
>
>
>