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#REDIRECT [[Quadrics (company)#QsNet]] {{R from merge}} {{R to section}} |
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QsNet is a high speed interconnect designed by [[Quadrics]] used in HPC [[Computer cluster|clusters]], particularly Linux [[Beowulf (computing)|Beowulf Clusters]]. Although it can be used with TCP/IP; like [[SCI]], [[Myrinet]] and [[Infiniband]] it is usually used with a Communication API such as [[Message_Passing_Interface|MPI]] or [[Shmem|SHMEM]] called from a [[Parallel_computing|Parallel Program]]. |
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[[Category:Computer buses]] |
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The Interconnect consists of a PCI card in each compute node and one or more a dedicated switch chasses. These are connected with a copper cables. Within the switch chassis are a number of line cards that carry ''Elite'' switch ASICs. These are internally linked to form a [[FatTree|Fat Tree]] Topology. Like other interconnects such as [[Myrinet]] very large systems can be build by using multiple switch chasses arranged as Spine (top-level) and Leaf (node-level) switches. Such systems are usually called [[FederatedNetworks|Federated Networks]] |
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As of 2003, there are two generations of QsNet. The older QsNET I was launched in 1998 and used PCI 66-64 cards that had 'elan3' Custom ASIC on them. These gave an MPI bandwitdh of around 350MByte/s unidirectional with 5us latency. QsNET II was lauched in 2003. It used PCI-X 133MHz cards that carry 'elan4' ASICs. These give an MPI bandwitdh of around 900MByte/s unidirectional with a latency around 2 us. |
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Latest revision as of 00:35, 2 July 2020
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