Using MPI.mod Files

C – Troubleshooting InfiniPath MPI Troubleshooting

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

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,

IB6054601-00 D

C-19

IB6054601-00 D specifications

The Q-Logic IB6054601-00 D is a high-performance InfiniBand adapter card designed for data centers and enterprise applications requiring robust connectivity and low-latency communication. This adapter is part of QLogic's extensive portfolio of networking solutions, catering to the needs of high-performance computing (HPC), cloud computing, and virtualization environments.

One of the standout features of the IB6054601-00 D is its capability to support data transfer rates of up to 56 Gbps. This makes it ideal for applications demanding large bandwidth and quick data processing. The adapter is optimized for RDMA (Remote Direct Memory Access) technology, which allows data to be transferred directly between the memory of different computers without involving the CPU. This reduces latency and CPU overhead, leading to enhanced overall system performance.

The architecture of the IB6054601-00 D includes support for a dual-port design, which offers increased bandwidth, redundancy, and fault tolerance. This dual-port configuration is especially advantageous for environments that require high availability and reliability, such as financial services and mission-critical applications.

The adapter utilizes advanced error detection and correction mechanisms, ensuring that data integrity is maintained during transmission. With features like adaptive routing and congestion management, the IB6054601-00 D is capable of optimizing the handling of data flows, thereby enhancing performance even under heavy loads.

In terms of compatibility, the Q-Logic IB6054601-00 D supports a wide range of operating systems and virtualization technologies, making it easy to integrate into diverse IT environments. It also includes drivers and software packages that facilitate seamless deployment and management.

In addition to high-speed connectivity, the adapter is designed with power efficiency in mind. It adheres to Energy Star regulations, helping organizations lower their operational costs while minimizing their environmental footprint.

Overall, the Q-Logic IB6054601-00 D stands out for its high throughput, low latency, and reliability. Its combination of advanced features and technologies positions it as an excellent choice for organizations looking to enhance their data center performance and maximize the efficiency of their network infrastructure. With the growing demands for faster and more efficient data transfer, solutions like the IB6054601-00 D are essential in meeting the evolving needs of modern enterprises.

Q-Logic IB6054601-00 D manual Using MPI.mod Files, HP-MPI mpirun and executable used together

Models: IB6054601-00 D