I agree about the names, it is very similar to MIN_LOC and MAX_LOC in fortran 90. However, I find difficult to define some algorithm able to do the same things.
Diego On 10 August 2018 at 19:03, Nathan Hjelm via users <users@lists.open-mpi.org > wrote: > 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 > > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users >
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