FDR adapters are lower latency than the QDR. So you will gain some with QDR, and the most with FDR.
Gilad -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Chris Samuel Sent: Monday, November 14, 2011 12:26 AM To: [email protected] Subject: Re: [Beowulf] building Infiniband 4x cluster questions Hi Gilad, On Mon, 14 Nov 2011 03:52:03 PM Gilad Shainer wrote: > There is some add latency due to the 66/64 new encoding, but overall > latency is lower than QDR. MPI is below 1us. Thanks for that. So I'd guess a pair of nodes with QDR cards in the same slot would have lower latency again ? cheers! Chris -- Christopher Samuel - Senior Systems Administrator VLSCI - Victorian Life Sciences Computation Initiative Email: [email protected] Phone: +61 (0)3 903 55545 http://www.vlsci.unimelb.edu.au/ _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
