Q

3 – Using InfiniPath MPI InfiniPath MPI Details

LD_LIBRARY_PATH, and other environment variables for the node programs through the use of the -rcfileoption of mpirun:

$ mpirun -np n -m mpihosts -rcfile mpirunrc program

In the absence of this option, mpirun checks to see if a file called

$HOME/.mpirunrc exists in the user's home directory. In either case, the file is sourced by the shell on each node at time of startup of the node program.

The .mpirunrc should not contain any interactive commands. It may contain commands that output on stdout or stderr.

When you do not specify an mpirunrc file, either through the option or the default ~/.mpirunrc, the environment on each node is whatever it would be for the user’s login via ssh, unless you are using MPD. (See section 3.8.)

There is a global options file that can be used for mpirun arguments. The default location of this file is:

/opt/infinipath/etc/mpirun.defaults

You can use an alternate file by setting the environment variable

$PSC_MPIRUN_DEFAULTS_PATH. See the mpirun man page for more information.

3.5.8.1

Environment for Multiple Versions of InfiniPath or MPI

The variable INFINIPATH_ROOT sets a root prefix for all Infinipath-related paths. It is used by mpirun to try to find the mpirun-ipath-sshexecutable, and it is also used to set up LD_LIBRARY_PATH for new programs. This allows multiple versions of the InfiniPath software releases to be installed on some or all nodes, as well as having InfiniPath MPI and other version(s) of MPI installed at the same time. It may be set in the environment, in mpirun.defaults, or in an rcfile (such

as .mpirunrc, .bashrc or .cshrc) that will be invoked on remote nodes.

If you have used the --prefixargument with the rpm command to change the root prefix for the InfiniPath installation, then set INFINIPATH_ROOT to the same value.

If INFINIPATH_ROOT is not set, the normal PATH is used unless mpirun is invoked with a full pathname.

NOTE: mpirun-ssh was renamed mpirun-ipath-ssh so as to avoid name collisions with other MPI implementations.

IB6054601-00 D

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Q-Logic IB6054601-00 D manual Environment for Multiple Versions of InfiniPath or MPI
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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.

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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.

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