Dear all, I have probably understood. The trick is to use a real vector and to memorize also the rank.
Have I understood correctly? thanks Diego On 10 August 2018 at 17:19, Diego Avesani <diego.aves...@gmail.com> wrote: > Deal all, > I do not understand how MPI_MINLOC works. it seem locate the maximum in a > vector and not the CPU to which the valur belongs to. > > @ray: and if two has the same value? > > thanks > > > Diego > > > On 10 August 2018 at 17:03, Ray Sheppard <rshep...@iu.edu> wrote: > >> As a dumb scientist, I would just bcast the value I get back to the group >> and ask whoever owns it to kindly reply back with its rank. >> Ray >> >> >> On 8/10/2018 10:49 AM, Reuti wrote: >> >>> Hi, >>> >>> Am 10.08.2018 um 16:39 schrieb Diego Avesani <diego.aves...@gmail.com>: >>>> >>>> Dear all, >>>> >>>> I have a problem: >>>> In my parallel program each CPU compute a value, let's say eff. >>>> >>>> First of all, I would like to know the maximum value. This for me is >>>> quite simple, >>>> I apply the following: >>>> >>>> CALL MPI_ALLREDUCE(eff, effmaxWorld, 1, MPI_DOUBLE_PRECISION, MPI_MAX, >>>> MPI_MASTER_COMM, MPIworld%iErr) >>>> >>> Would MPI_MAXLOC be sufficient? >>> >>> -- Reuti >>> >>> >>> However, I would like also to know to which CPU that value belongs. Is >>>> it possible? >>>> >>>> I have set-up a strange procedure but it works only when all the CPUs >>>> has different values but fails when two of then has the same eff value. >>>> >>>> Is there any intrinsic MPI procedure? >>>> in anternative, >>>> do you have some idea? >>>> >>>> really, really thanks. >>>> Diego >>>> >>>> >>>> Diego >>>> >>>> _______________________________________________ >>>> users mailing list >>>> users@lists.open-mpi.org >>>> https://lists.open-mpi.org/mailman/listinfo/users >>>> >>> _______________________________________________ >>> users mailing list >>> users@lists.open-mpi.org >>> https://lists.open-mpi.org/mailman/listinfo/users >>> >> >> _______________________________________________ >> users mailing list >> users@lists.open-mpi.org >> https://lists.open-mpi.org/mailman/listinfo/users >> > >
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