Myrinet
Myrinet, ANSI/VITA 26-1998, ishigh-speed local area networking system designed by Myricombe used as an interconnect between multiple machinesform computer clusters. Myrinet has much less protocol overhead than standards such as Ethernet,therefore provides much better throughputless latency while usinghost CPU much less interference. Althoughcan be used astraditional networking system, Myrinetoften used directly by programs that "know" about it, thereby bypassingcall intooperating system.Myrinet physically consiststwo fibre optic cables, upstreamdownstream, connected tohost computers withsingle connector. Machinesconnected together via low-overhead routersswitches, as opposedconnecting one machine directlyanother. Myrinet includesnumberfault-tollerance features, mostly backed byswitches. These include flow control, error control,"heartbeat" monitoring on every link. The first generation provided 512 Mbit/s data ratesboth directions,later versions supported 1.28 Gbit/s2 Gbit/s.
Myrinet's throughputclose totheoretical maximum ofphysical layer. Onlatest 2.0 Gbit/s links Myranet often runs at 1.98 Gbit/ssustained throughput, considerably better than what Ethernet offers, from 0.61.9 Gbit/s depending on load.
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