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? -- Jeff Squyres Cisco Systems
