Q

3 – Using InfiniPath MPI InfiniPath MPI Details

program-namewill generally be the pathname to the executable MPI program. If the MPI program resides in the current directory and the current directory is not in your search path, then program-namemust begin with ‘./’, such as:

./program-name

Unless you want to run only one instance of the program, you need to use the -npoption, as in:

$ mpirun -npn [other options] program-name

This spawns n instances of program-name.We usually call these instances node programs.

Each node program is started as a process on one node. While it is certainly possible for a node program to fork child processes, the children must not themselves call MPI functions.

mpirun monitors the parallel MPI job, terminating when all the node programs in that job exit normally, or if any of them terminates abnormally.

Killing the mpirun program kills all the processes in the job. Use Ctrl-Cto do this.

3.5.6

The mpihosts File

As noted in section 3.3 you have created an mpihosts file (also called a machines file, node file, or hosts file) in your current working directory. This file names the nodes on which the node programs may run. The mpihosts file contains lines of the form:

hostname[:p]

The optional part :p specifies the number of node programs that can be spawned on that node. When not specified, the default value is 1. The two supported formats for the mpihosts file are:

hostname1

hostname2

...

or

hostname1:process_count hostname2:process_count

...

In the first format, if the -np count is greater than the number of lines in the machine file, the hostnames will be repeated (in order) as many times as necessary for the requested number of node programs.

In the second format process_count can be different for each host, and is normally the number of available processors on the node. Up to process_count node

IB6054601-00 D

3-11

Page 52 Page 54
Page 53
Image 53
Q-Logic IB6054601-00 D manual Mpihosts File
Page 52 Page 54

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.
Top Page Image Contents