That will give me the optimum value of  f(x1, ..., xn) but not _which_ (x1,....xn) gives that optimum evaluation of f.


On 14 October 2013 09:57, Matthias Troyer <> wrote:

On 14 Oct 2013, at 10:53, MM <> wrote:

In a problem of getting the maximum of a multi-variable function, I would use mpi::reduce and provide it with a function object that compares the evaluations of this function.

Each process evaluates a part of the space, ie a number of n-tuples of the n-dimension space.

How do I get the n-tuple that yields the max of f(), given that MPI_MAXLOC is not available in boost mpi?



Hi MM,

you can just provide your own function object to the boost::mpi::reduce function


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