OpenMPI 1.3.3 comes with a range of algorithms for MPI_Allgather(), but I have not been able to
find out how to check which algorithms is actually used.
>From the following message on the list I got an idea about how to select the algoritm by hand
but I should like to be able to find out at runtime which algorithm Open MPI has chosen.
BTW, is one algorithm chosen the first time MPI_Allgather() is called, or is a new algorithm
chosen for every call based on message properties?
Dr. Hans Ekkehard Plesser
Dept. of Mathematical Sciences and Technology
Norwegian University of Life Sciences
Phone +47 6496 5467
Fax +47 6496 5401