I installed OpenMPI-1.2.4 on our cluster.

Here is the compute node infor

[qiang@compute-0-1 ~]$ uname -a
Linux compute-0-1.local 2.6.9-42.0.2.ELsmp #1 SMP Wed Aug 23 00:17:26 CDT 2006 i686 i686 i386 GNU/Linux
[qiang@compute-0-1 bin]$ gcc -v
Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.6/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux
Thread model: posix
gcc version 3.4.6 20060404 (Red Hat 3.4.6-8)

Then I compiled NAS bechmarks, got some warning but went through.

[qiang@compute-0-1 NPB2.3-MPI]$ make suite
make[1]: Entering directory `/home/qiang/NPB2.3/NPB2.3-MPI'
   =========================================
   =      NAS Parallel Benchmarks 2.3      =
   =      MPI/F77/C                        =
   =========================================

cd MG; make NPROCS=16 CLASS=B
make[2]: Entering directory `/home/qiang/NPB2.3/NPB2.3-MPI/MG'
make[3]: Entering directory `/home/qiang/NPB2.3/NPB2.3-MPI/sys'
cc -g -o setparams setparams.c
make[3]: Leaving directory `/home/qiang/NPB2.3/NPB2.3-MPI/sys'
../sys/setparams mg 16 B
make.def modified. Rebuilding npbparams.h just in case
rm -f npbparams.h
../sys/setparams mg 16 B
mpif77 -c -I~/MyMPI/include mg.f
mg.f: In subroutine `zran3':
mg.f:1001: warning:
         call mpi_allreduce(rnmu,ss,1,dp_type,
              1
mg.f:2115: (continued):
            call mpi_allreduce(jg(0,i,1), jg_temp,4,MPI_INTEGER,
                 2
Argument #1 of `mpi_allreduce' is one type at (2) but is some other type at (1) [info -f g77 M GLOBALS]
mg.f:1001: warning:
         call mpi_allreduce(rnmu,ss,1,dp_type,
              1
mg.f:2115: (continued):
            call mpi_allreduce(jg(0,i,1), jg_temp,4,MPI_INTEGER,
                 2
Argument #2 of `mpi_allreduce' is one type at (2) but is some other type at (1) [info -f g77 M GLOBALS]
mg.f:1001: warning:
         call mpi_allreduce(rnmu,ss,1,dp_type,
              1
mg.f:2139: (continued):
            call mpi_allreduce(jg(0,i,0), jg_temp,4,MPI_INTEGER,
                 2
Argument #1 of `mpi_allreduce' is one type at (2) but is some other type at (1) [info -f g77 M GLOBALS]
mg.f:1001: warning:
         call mpi_allreduce(rnmu,ss,1,dp_type,
              1
mg.f:2139: (continued):
            call mpi_allreduce(jg(0,i,0), jg_temp,4,MPI_INTEGER,
                 2
Argument #2 of `mpi_allreduce' is one type at (2) but is some other type at (1) [info -f g77 M GLOBALS]
cd ../common; mpif77 -c -I~/MyMPI/include print_results.f
cd ../common; mpif77 -c -I~/MyMPI/include randdp.f
cd ../common; mpif77 -c -I~/MyMPI/include timers.f
mpif77 -o ../bin/mg.B.16 mg.o ../common/print_results.o ../common/randdp.o ../common/timers.o -L~/MyMPI/lib -lmpi_f77
make[2]: Leaving directory `/home/qiang/NPB2.3/NPB2.3-MPI/MG'
make[1]: Leaving directory `/home/qiang/NPB2.3/NPB2.3-MPI'
make[1]: Entering directory `/home/qiang/NPB2.3/NPB2.3-MPI'

But when I tried to run it, I got the following error messages:

[qiang@compute-0-1 bin]$ mpirun -machinefile m8 -n 16 mg.C.16
[compute-0-1.local:11144] [0,0,0] ORTE_ERROR_LOG: Data unpack had inadequate space in file dss/dss_unpack.c at line 90
[compute-0-1.local:11144] [0,0,0] ORTE_ERROR_LOG: Data unpack had inadequate space in file gpr_replica_cmd_processor.c at line 361

I found some info on the mailling list, but it doesn't help for my case.

Could anyone give me some advice? Or I have to upgrade the GNU compiler?

Thanks.

Qiang