Search for: [Abstract = "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."]
