Hi,
a similar question was recently discussed on the mailing list:
http://www.open-mpi.org/community/lists/users/2009/08/10458.php
George Markomanolis wrote:
Dear all,
I am trying to figure out the algorithms that are used for some
collective communications (allreduce, bcast, alltoall). Is
Dear all,
I am trying to figure out the algorithms that are used for some
collective communications (allreduce, bcast, alltoall). Is there any
document to explain which algorithms are used? For example I would like
to know exactly how the command allreduce is analyzed to send and receive.
