They do not fit with the rest of the predefined operations (which operate on a single basic type) and can easily be implemented as user defined operations and get the same performance. Add to that the fixed number of tuple types and the fact that some of them are non-contiguous (MPI_SHORT_INT) plus the terrible names. If I could kill them in MPI-4 I would.
> On Aug 10, 2018, at 9:47 AM, Diego Avesani <diego.aves...@gmail.com> wrote: > > 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 > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users
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