[Beowulf] building Infiniband 4x cluster questions

Gilad Shainer Shainer at Mellanox.com
Mon Nov 14 03:30:35 EST 2011


FDR adapters are lower latency than the QDR. So you will gain some with QDR, and the most with FDR.

Gilad


-----Original Message-----
From: beowulf-bounces at beowulf.org [mailto:beowulf-bounces at beowulf.org] On Behalf Of Chris Samuel
Sent: Monday, November 14, 2011 12:26 AM
To: beowulf at beowulf.org
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: samuel at unimelb.edu.au Phone: +61 (0)3 903 55545
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