View source for Myrinet

=== Performance ===
{| class="wikitable"
|+
! colspan="2" |Generation
!Year<ref>{{Cite book |title=Encyclopedia of Parallel Computing |publisher=IEEE |year=2011 |isbn=978-0-387-09765-7 |editor-last=Padua |editor-first=David |pages=1239–1247 |doi=10.1007/978-0-387-09766-4}}</ref>
!Bandwidth
!Notes
|-
|1
|Myrinet
|1994
|0.64 Gbit/s
|[[Positive emitter-coupled logic|PECL]] PHY
|-
| rowspan="2" |2
|Myrinet-LAN
| rowspan="2" |1996
| rowspan="2" |1.28 Gbit/s
|Backwards compatible with original Myrinet.<br/>[[LVDS]] PHY for 1.28&nbsp;Gbit/s operation.<ref>{{Cite web |date=1997-01-17 |title=M2M-M2F description |url=http://www.myri.com/myrinet/linkdev/m2m-m2f.html |access-date=2023-11-11 |archive-url=https://web.archive.org/web/19970117054039/http://www.myri.com/myrinet/linkdev/m2m-m2f.html |archive-date=1997-01-17 }}</ref>
|-
|Myrinet-SAN
|System-Area Network, shorter reach (3m) but lower cost<ref>{{Cite web |date=1997-01-17 |title=Myrinet - A Brief, Technical Overview |url=http://www.myri.com/myrinet/overview.html |access-date=2023-11-11 |archive-url=https://web.archive.org/web/19970117053706/http://www.myri.com/myrinet/overview.html |archive-date=1997-01-17 }}</ref>
|-
|3
|Myrinet-2000
|2000
|2 Gbit/s
|Backwards-compatible with [[Gigabit Ethernet]]
|-
|4
|Myri-10G
|2005
|10 Gbit/s
|Backwards-compatible with [[10 Gigabit Ethernet]]
|}
Myrinet is a lightweight protocol with little overhead that allows it to operate with throughput close to the basic signaling speed of the physical layer. For supercomputing, the low latency of Myrinet is even more important than its throughput performance, since, according to [[Amdahl's law]], a high-performance parallel system tends to be bottlenecked by its slowest sequential process, which in all but the most [[embarrassingly parallel]] supercomputer workloads is often the latency of message transmission across the network.