[Beowulf] Performance characterising a HPC application

Gilad Shainer Shainer at mellanox.com
Mon Mar 26 12:52:23 EDT 2007


 
> obviously, there are 
> many applications which have absolutely no use for bandwidth 
> greater than even plain old gigabit.
> equally obvious, there are others which are sensitive to 
> small-packet latency, which is not affected by DDR or dual-rail.


Yes, there are application that don't utilize the interconnect and
therefore
will show the same results on 1GigE and 100GigE. I was referring to the 
application that do utilize the interconnect, and those are the ones
that I test.

Anyway, the I/O is not just bandwidth, but also provides latency, CPU
overhead 
and other important characteristics, and all of them need to be
considered.


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