> > Just in case you've missed the announcements: > > > > http://www.clustermonkey.net//content/view/222/1/ > > Interesting that Infiniband is getting down close to the > predicted $100 per HCA price. Certainly $250 per node (HCA, > cable, and switch) for 24 ports makes it easier to justify if > the performance is there. So of course that begs the > question, what is the performance? > > I noticed that the price is for the InfiniHost III Lx, does > anyone know if the Ex (mentioned in the performance table) > and Lx (mentioned in the price list) perform identically? Or > any of the standard numbers for MPI latency and/or bandwidth > for the Lx part? > > I googled around and found a few PDFs, but no real numbers. > Some EE magazine mentioned 4us roughly, but it wasn't clear > exactly what they were measuring. >
Mellanox has 4 IB families - InfiniHost, InfiniHost III Lx, InfiniHost III Ex and ConnectX. InfiniHost is a PCI-X device and the other 3 are PCIe based. The Ex and LX support IB DDR and ConnectX supports IB QDR and PCIe Gen2. >From latency point of view, the LX is a 3.5-3.3us MPI latency (SDR/DDR), the Ex is 2.6-2.3us (SDR/DDR) and ConnectX is 1.2-1us (PCIe Gen1/Gen2). For BW, Lx provides ~1400MB/s, EX is ~1500MB/s and ConnectX is ~1900MB/s uni-directional on PCIe Gen2. Feel free to contact me directly for more info. Gilad. _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
