[OMPI users] Complexity of MPI_Comm_split and MPI_Comm_Create?

2015-01-19 Thread Jonathan Eckstein
. Professor Jonathan Eckstein Rutgers University

Re: [OMPI users] Complexity of MPI_Comm_split and MPI_Comm_Create?

2015-01-20 Thread Jonathan Eckstein
lreduce operation, each being O(log P). For Allgather we could a combination of a linear gather (O(P)) and a binary tree broadcast (O(log P)). So as of today, Comm_split is more expensive than Comm_create. Thanks Edgar On 1/19/2015 4:13 PM, Jonathan Eckstein wrote: Dear Open MPIers: I have