[Beowulf] many cores and ib

Jan Heichler jan.heichler at gmx.net
Mon May 5 23:43:53 PDT 2008


Hallo Gilad,

Montag, 5. Mai 2008, meintest Du:


>> Bonding (or multi-rail) does not make sense with "standard IB" in PCIe
GS> x8 since the PCIe connection limits the transfer rate of a single
GS> IB-Link already. 

>> My hint would be to go for Infinipath from QLogic or the new ConnectX
GS> from Mellanox since message rate is probably your limiting factor and
GS> those technologies have a huge advantage over standard Infiniband
GS> SDR/DDR. 


>> Infinipath and ConnectX are available as DDR Infiniband and provide a
GS> bandwidth of more than 1800 MB/s.
GS>  
GS>  
GS> Boding can provide more bandwidth if needed. Each PCIe x8 slot can
GS> provide (in average) around 1500MB/s, therefore using IB DDR (no need to
GS> be ConnectX), you will get 1500MB/s uni-dir from each PCIe Gen1 x8 slot.

Ahh... sorry... i was just thinking about dual-port cards. Not different cards in different slots. 

Cheers,
Jan
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