On 7/15/05 9:05 AM, Tim Cutts <tjrc at sanger.ac.uk> wrote: > On 14 Jul 2005, at 11:24 pm, David Kramer wrote: > >> Respectfully, and at the risk of sounding, ridiculously naive -- >> why not >> consider upgrading the I/O switching technology to Myrinet or >> Infiniband for >> higher-bandwidth and ultra-low latency, before buying more servers? > > Depends on the application. Gigabit ethernet is reasonable > bandwidth, it's just not very good latency. So if you do a lot of > properly parallel MPI stuff where fast job turnaround is important, > then the low latency interconnect might be a winner. But for those > of us (and Sanger is an example) where throughput is paramount, and > individual job turnaround less so, the embarrassingly parallel single- > threaded job approach is king; in such scenarios low latency > interconnects cost a lot of money for relatively little gain, and > increasing node count gives a better return. So now its my turn - respectfully (and at the risk of sounding ridiculously naïve myself) - can you use the low latency interconnects (myrinet or Infiniband) for TCP or UDP bound services (like NFS or AFP)? My understanding was that they were only for things like MPI...? -- M. Michael Barmada, Ph.D. Associate Professor of Human Genetics Graduate School of Public Health, University of Pittsburgh ===================================================================== There are three kinds of people in this world: those that can count, and those that can't... The requirements said: Windows 2000 or better. So I got a Macintosh. To know the mighty works of God; to comprehend His wisdom and majesty and power; to appreciate, in degree, the wonderful working of His laws, surely all this must be a pleasing and acceptable mode of worship to the Most High, to whom ignorance can not be more grateful than knowledge. ~Copernicus =====================================================================