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Los Alamos Message Passing Interface 1.5.16 RC1

  Date Added: January 18, 2010  |  Visits: 827

Los Alamos Message Passing Interface 1.5.16

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Los Alamos Message Passing Interface is an implementation of the Message Passing Interface (MPI) motivated by a growing need for fault tolerance at the software level in large high-performance computing (HPC) systems. This need is caused by the vast number of components present in modern HPC systems, particularly clusters. The individual components -- processors, memory modules, network interface cards (NICs), etc. -- are typically manufactured to tolerances adequate for small or desktop systems. When aggregated into a large HPC system, however, system-wide error rates may be too great to successfully complete a long application run. For example, a network device may have an error rate which is perfectly acceptable for a desktop system, but not in a cluster of thousands of nodes, which must run error free for many hours or even days to complete a scientific calculation. LA-MPI has two primary goals: network fault tolerance and high performance. Network fault tolerance is acheived by implementing a highly efficient checksum/retransmission protocol. The integrity of delivered data is (optionally) verified at the user-level using a checksum or CRC. Data that is corrupt (or never delivered) is retransmitted. As for high performance, LA-MPIs lightweight checksum/retransmission protocol allows us to achieve low latency messaging. Furthermore, the flexible approach taken to the use of redundant data paths in a network-device-rich system leads to high network bandwidth since different messages and/or message-fragments can be sent in parallel along different paths. Also, since LA-MPI is developed for use on the the large systems at Los Alamos National Laboratory we have verified that LA-MPI is scalable to over 3,500 processes. An alternative solution to the network fault tolerance problem is to use the TCP/IP protocol. We believe, however, that this protocol -- developed to handle unreliable, inhomogeneous and oversubscribed networks -- performs poorly and is overly complex for HPC system messaging, and that LA-MPIs lightweight checksum/retransmission protocol is a more appropriate choice..

Requirements: No special requirements
Platforms: Linux
Keyword: Alamos Fault Tolerance Hpc Interface Los Los Alamos Los Alamos Message Passing Interface Message Message Passing Mpi Network Network Fault Tolerance Passing
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License: Freeware Size: 1.3 MB
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