On Tue 08 May 2012 02:53:28 AM CEST, Jeff Squyres (jsquyres) wrote:
I *believe* that this value came out of IB hardware history. I.e., when we
wrote the openib BTL, some empirical testing showed that 12k was a good value.
Thanks a lot for the clarification. Do you know if this empirical tests
has been published somehow/somewhere?
cheers, Simone
On May 7, 2012, at 9:25 AM, Simone Pellegrini wrote:
Hello,
I have one of those 1M dollar questions I guess, but why the eager limit
threshold for Infiniband is set to 12KB by default in OpenMPI? I would like to
know where this value comes from. I am not wondering whether this is a good
setting for this parameter, but just why this is considered to be a good
trade-off for all Infiniband clusters. What I would like to know at the end of
the story is whether this is an empirical value or if there are architecture
characteristics of IB which make this value come out of pen and paper work (any
pointer would be appreciated).
thanks in advance for the reply.
regards,
Simone P.
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