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Methodology of the direct measurement of the switching latency

Hegr T., Bohac L., Kocur Z., Voznak M., Chlumsky P.

Przegląd Elektrotechniczny

2013

R. 89, nr 7

59--63

The article provides a measurement methodology based on the related RFCs. It brings a solution of determining the switching latency on the physical layer using common measuring devices. As a proof of concept were done a number of the experimental measurements, including analysis of the results. Switching latency is an important performance parameter which participates in the decision-making whether to deploy the switch to low-latency environments. This is especially important in industrial networks for real-time systems involving smart grids. Determine the value of the switching latency is also an important step in the eventual deployment of the OpenFlow technology on this field.

Zaprezentowano metodę badania opóźnień w przełączaniu (switching latency) bazująca na RFC. Parametr ten jest bardzo ważny w sieciach przemysłowych łącznie z sieciami typu smart grid.

An Ultrahigh Performance MPI Implementation on SGI® ccNUMA Altix® Systems

Feind K., McMahon K.

Computational Methods in Science and Technology

2006

Vol. spec. issue

67-70

The SGI® Message Passing Toolkit (MPT) software has implemented algorithms that provide extremely high-performance message passing on SGI Altix systems based on the SGI NUMAlink™ interconnect technology. Using Linux® OS infrastructure and SGI XPMEM cross-host memory-mapping software, SGI MPI delivers extremely high MPI performance on shared-memory single host/SMP Altix systems as well as multihost superclusters. This paper outlines the Altix hardware features, OS features, and library software algorithms that have been developed to provide the low-latency and high-bandwidth capabilities. We present high-performance features like direct copy send/receive, collectives, and the ultralow-latency SHMEM™ data transfer library. We include MPI benchmark results, including an MPI ping pong latency that ranges from 1.2 to 2.3 microseconds on a 512-CPU Altix system with 1.5 GHz Intel® Itanium® 2 Processors.