[OMPI devel] latency and increasing number of processes

[Terry Dontje]

Just curious has anyone done comparisons of latency measurements as one 
changes the size of a job.  That is changing the size of the job (and 
number of nodes used) and just taking the half roundtrip latency of two 
of the processes in the job.  I am roughly seeing an addition of 5% to 
the latency for each node added.  This is with the TCP and Udapl BTLs.  
I am curious whether other BTLs have similar issues and if doing some 
sort of directed polling would help matters?

--td