Dear all, I have just implemented MAXLOC, why should they go away? it seems working pretty well.
thanks Diego On 10 August 2018 at 17:39, Nathan Hjelm via users <users@lists.open-mpi.org > wrote: > The problem is minloc and maxloc need to go away. better to use a custom > op. > > On Aug 10, 2018, at 9:36 AM, George Bosilca <bosi...@icl.utk.edu> wrote: > > You will need to create a special variable that holds 2 entries, one for > the max operation (with whatever type you need) and an int for the rank of > the process. The MAXLOC is described on the OMPI man page [1] and you can > find an example on how to use it on the MPI Forum [2]. > > George. > > > [1] https://www.open-mpi.org/doc/v2.0/man3/MPI_Reduce.3.php > [2] https://www.mpi-forum.org/docs/mpi-1.1/mpi-11-html/node79.html > > On Fri, Aug 10, 2018 at 11:25 AM Diego Avesani <diego.aves...@gmail.com> > wrote: > >> 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 >>>> >>> >>> >> _______________________________________________ >> 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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