Q

A – Benchmark Programs Benchmark 4: Measuring MPI Latency in Host Rings

A.4

Benchmark 4: Measuring MPI Latency in Host Rings

The program mpi_latency can be used to measure latency in a ring of hosts. Its syntax is a bit different from Benchmark 1 in that it takes command line arguments that let you specify the message size and the number of messages over which to average the results. So, for example, if you have a hosts file listing four or more nodes, the command:

$ mpirun -np 4 -ppn 1 -m mpihosts mpi_latency 100 0

might produce output like this:

0 1.760125

This indicates that it took an average of 1.76 microseconds per hop to send a zero-length message from the first host, to the second, to the third, to the fourth, and then get replies back in the other direction.

IB6054601-00 D

A-5

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Q-Logic IB6054601-00 D manual Benchmark 4 Measuring MPI Latency in Host Rings, Might produce output like this
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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.

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.
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