Re: [OMPI users] Factor of 10 loss in performance with 1.3.x

[Iain Bason]

There are a bunch changes in the shared memory module between 1.2.9  
and 1.3.1.  One significant change is the introduction of the "sendi"  
internal interface.  I believe George Bosilca did the initial  
implementation.  This is just a wild guess, but maybe there is  
something about sendi that increases latency when using the shared  
memory module.

Iain