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C – Troubleshooting
InfiniPath MPI Troubleshooting
IB6054601-00 D C-19
Q
The following two commands will both work properly:
QLogic mpirun and executable used together:
$ mpirun -m ~/host-bbb -np 4 /usr/bin/mpi_nxnlatbw
HP-MPI mpirun and executable used together:
$ /opt/hpmpi/bin/mpirun -hostlist \
"bbb-01,bbb-02,bbb-03,bbb-04" -np 4 ./hpmpi-mpi_nxnlatbw
Hints:
Use the rpm command to find out which RPM is installed in the standard installed
layout. For example:
# rpm -qf /usr/bin/mpirun
mpi-frontend-2.0-964.731_fc3_psc.i386.rpm
Check all rcfiles and /opt/infinipath/etc/mpirun.defaults to make sure
that the paths for binaries and libraries ($PATH and $LD_LIBRARY _PATH) are
consistent.
When compiling, use descriptive names for the object files.
See section C.8.4, section C.8.5, and section C.8.6 for additional information.
C.8.8
Process Limitation with ssh
MPI jobs that use more than 8 processes per node may encounter an ssh throttling
mechanism that limits the amount of concurrent per-node connections to 10. If you
have this problem, you will see a message similar to this when using mpirun:
$ mpirun -m tmp -np 11 ~/mpi/mpiworld/mpiworld
ssh_exchange_identification: Connection closed by remote host
MPIRUN: Node program(s) exited during connection setup
If you encounter a message like this, you or your system administrator should
increase the value of ’MaxStartups’ in your sshd configurations.
C.8.9
Using MPI.mod Files
MPI.mod (or mpi.mod) are the Fortran90/Fortran95 mpi modules files. These
contain the Fortran90/Fortran95 interface to the platform-specific MPI library. The
module file is invoked by ‘USE MPI’ or ‘use mpi’ in your application. If the application
has an argument list that doesn’t match what mpi.mod expects, errors such as this
can occur:
$ mpif90 -O3 -OPT:fast_math -c communicate.F
call mpi_recv(nrecv,1,mpi_integer,rpart(nswap),0,