Jeff Squyres wrote:
On May 10, 2007, at 8:23 AM, Or Gerlitz wrote:
A different approach which you might want to consider is to have at
the btl level --two-- connections per <src,dst> ranks. so if A wants
to send B it does so through the A --> B connection and if B wants to
send A it does so through the B --> A connection. To some extent, this
is the approach taken by IPoIB-CM (I am not enough into the RFC to
understand the reasoning but i am quite sure this was the approach in
the initial implementation). At first thought it mights seems not very
elegant, but taking it into the details (projected on the ompi env)
you might find it even nice.
What is the advantage of this approach?
To start with, my hope here is at least to be able play defensive here,
that is convince you that the disadvantages are minor, where only if
this fails, would schedule myself some reading into the ipoib-cm rfc to
dig the advantages.
Or.
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