[Beowulf] MPI performance gain with jumbo frames
deadline at eadline.org
Mon Jun 11 08:43:02 PDT 2007
1) The results you reference are rather old. Does this
reflect your hardware?
2) To support Jumbo Frames you need both NICs and a switch
that support them.
3) It is possible to achieve wire speed from
GigE, you need something other then 32 bit PCI
connections, however. (PCIe, PCI-X)
4) While Jumbo Frames can help NFS, the effect on MPI
can vary by application. Have you run any tests to
see exactly what your network performance is?
You may find these articles helpful:
> hi all,
> new to this list, so don't know if this is offtopic.
> i'd like to know experiences about MPI performance gain with jumbo frames.
> manage a beowulf cluster (42 athlon xp, gentoo linux) with gigabit
> where fluent, openfoam and other mpi apps are run.
> with NFS i'm sure wich kind of gain i would have, but with MPI apps i'm
> worried about after seeing this page
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