Hi! 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 http://www.open-mpi.org/community/lists/users/2008/10/6847.php, 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? Best regards, Hans -- Dr. Hans Ekkehard Plesser Associate Professor Dept. of Mathematical Sciences and Technology Norwegian University of Life Sciences Phone +47 6496 5467 Fax +47 6496 5401 Email hans.ekkehard.ples...@umb.no Home http://arken.umb.no/~plesser