[Beowulf] building Infiniband 4x cluster questions

Christopher Samuel samuel at unimelb.edu.au
Sun Nov 13 21:40:52 EST 2011


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Hi Gilad,

On 08/11/11 12:53, Gilad Shainer wrote:

> The latency numbers are more or less the same between
> the IB vendors on SDR, DDR and QDR. Mellanox is the
> only vendor with FDR IB for now, and with PCIe 3.0
> latency are below 1us (RDMA much below...).

Is that for an MPI message ?  I'd heard that FDR might
have higher latencies due to the coding changes that
were happening - is this not the case ?

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
         http://www.vlsci.unimelb.edu.au/

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