InfiniPath MPI Details

3 – Using InfiniPath MPI InfiniPath MPI Details

You may need to instead pass arguments to configure directly, in a fashion similar to this:

$ ./configure -cc=mpicc -fc=mpif77 -c++=mpicxx -c++linker=mpicxx

Sometimes you may need to edit a Makefile to achieve this result, adding lines similar to:

CC=mpicc

F77=mpif77

F90=mpif90

F95=mpif95

CXX=mpicxx

In some cases, the configuration process may specify the linker. It is recommended that the linker be specified as mpicc, mpif90, etc. in these cases. That will automatically include the correct flags and libraries, rather than trying to configure to pass the flags and libraries explicitly. For example:

LD=mpicc

LD=mpif90

These scripts pass appropriate options to the various compiler passes to include header files, required libraries, etc. While the same effect can be achieved by passing the arguments explicitly as flags, the required arguments may vary from release to release, so it's good practice to use the provided scripts.

3.5

This section gives more details on the use of InfiniPath MPI. We assume the reader has some familiarity with standard MPI. See the references in appendix D.1. This implementation does include the man pages from the MPICH implementation for the numerous MPI functions.

3.5.1

Configuring for ssh Using ssh-agent

The command mpirun can be run on the front end or on any other node. In InfiniPath MPI, this uses the secure shell command ssh to start instances of the given MPI program on the remote compute nodes. To use ssh, the user must have generated RSA or DSA keys, public and private. The public keys must be distributed to all the compute nodes so that connections to the remote machines can be established without supplying a password. Each user can accomplish this through use of the ssh-agent. ssh-agentis a daemon that caches decrypted private keys. You use ssh-addto add your private keys to ssh-agent’s cache. When ssh establishes a new connection, it communicates with ssh-agentin order to acquire these keys, rather than prompting you for a passphrase.

IB6054601-00 D

3-5

IB6054601-00 D specifications

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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.

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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 InfiniPath MPI Details, Configuring for ssh Using ssh-agent

Models: IB6054601-00 D