Myrinet scalability

Ole W. Saastad ole at
Sun Jun 16 01:53:45 PDT 2002

with this talk about scalability and switches I would like to
point out that the SCI interconnect uses no switch.
The only thing you need to add an extra compute nodes
and just recable the cluster. The cost increases linearly with
the number of nodes. There are no step costs when you must buy
more switch ports. Each of the SCI cards are in fact a switch and
the switch in then distributes over the whole cluster and thence
scale with the number of nodes (Scalable Coherent Interface).
In this way you will always have full bisection bandwidth and
extremely low latency throughout the cluster. Try running the
benchmark all2all on different clusters and interconnects.

Technical information :

Ole W. Saastad, Dr.Scient. Scali AS P.O.Box 150 Oppsal 0619 Oslo NORWAY
Tel:+47 22 62 89 68(dir) mailto:ole at
Are you meeting Petaflop requirements with Gigaflops performance ?
    - Scali Terarack bringing Teraflops to the masses.

More information about the Beowulf mailing list