Thanks Edgar, but can i use these libraries also in a not NUMA machines? 2008/11/20 Edgar Gabriel <gabr...@cs.uh.edu>: > if you look at recent versions of libnuma, there are two functions called > numa_run_on_node() and numa_run_on_node_mask(), which allow thread-based > assignments to CPUs.... > > Thanks > Edgar > > Gabriele Fatigati wrote: >> >> Is there a way to assign one thread to one core? Also from code, not >> necessary with OpenMPI option. >> >> Thanks. >> >> 2008/11/19 Stephen Wornom <stephen.wor...@sophia.inria.fr>: >>> >>> Gabriele Fatigati wrote: >>>> >>>> Ok, >>>> but in Ompi 1.3 how can i enable it? >>>> >>> This may not be relevant, but I could not get a hybrid mpi+OpenMP code to >>> work correctly. >>> Would my problem be related to Gabriele's and perhaps fixed in openmpi >>> 1.3? >>> Stephen >>>> >>>> 2008/11/18 Ralph Castain <r...@lanl.gov>: >>>> >>>>> I am afraid it is only available in 1.3 - we didn't backport it to the >>>>> 1.2 >>>>> series >>>>> >>>>> >>>>> On Nov 18, 2008, at 10:06 AM, Gabriele Fatigati wrote: >>>>> >>>>> >>>>>> Hi, >>>>>> how can i set "slot mapping" as you told me? With TASK GEOMETRY? Or is >>>>>> a new 1.3 OpenMPI feature? >>>>>> >>>>>> Thanks. >>>>>> >>>>>> 2008/11/18 Ralph Castain <r...@lanl.gov>: >>>>>> >>>>>>> Unfortunately, paffinity doesn't know anything about assigning >>>>>>> threads >>>>>>> to >>>>>>> cores. This is actually a behavior of Linux, which only allows >>>>>>> paffinity >>>>>>> to >>>>>>> be set at the process level. So, when you set paffinity on a process, >>>>>>> you >>>>>>> bind all threads of that process to the specified core(s). You cannot >>>>>>> specify that a thread be given a specific core. >>>>>>> >>>>>>> In this case, your two threads/process are sharing the same core and >>>>>>> thus >>>>>>> contending for it. As you'd expect in that situation, one thread gets >>>>>>> the >>>>>>> vast majority of the attention, while the other thread is mostly >>>>>>> idle. >>>>>>> >>>>>>> If you can upgrade to the beta 1.3 release, try using the slot >>>>>>> mapping >>>>>>> to >>>>>>> assign multiple cores to each process. This will ensure that the >>>>>>> threads >>>>>>> for >>>>>>> that process have exclusive access to those cores, but will not bind >>>>>>> a >>>>>>> particular thread to one core - the threads can "move around" across >>>>>>> the >>>>>>> specified set of cores. Your threads will then be able to run without >>>>>>> interfering with each other. >>>>>>> >>>>>>> Ralph >>>>>>> >>>>>>> >>>>>>> On Nov 18, 2008, at 9:18 AM, Gabriele Fatigati wrote: >>>>>>> >>>>>>> >>>>>>>> Dear OpenMPI developers, >>>>>>>> i have a strange problem with mixed program MPI+OPENMP over OpenMPI >>>>>>>> 1.2.6. I'm using PJL TASK GEOMETRY in LSF Scheduler, setting 2 MPI >>>>>>>> process every compute node, and 2 OMP threads per process. Using >>>>>>>> paffinity and maffinity, i've noted that over every node, i have 2 >>>>>>>> thread that works 100%, and 2 threads doesn't works, or works very >>>>>>>> few. >>>>>>>> >>>>>>>> If i disable paffinity and maffinity, 4 threads works well, without >>>>>>>> load imbalance. >>>>>>>> I don't understand this issue: paffinity and maffinity should map >>>>>>>> every thread over a specific core, optimizing the cache flow, but i >>>>>>>> have this without settings there! >>>>>>>> >>>>>>>> Can i use paffinity and maffinity in mixed MPI+OpenMP program? Or it >>>>>>>> works only over MPI thread? >>>>>>>> >>>>>>>> Thanks in advance. >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> Ing. Gabriele Fatigati >>>>>>>> >>>>>>>> CINECA Systems & Tecnologies Department >>>>>>>> >>>>>>>> Supercomputing Group >>>>>>>> >>>>>>>> Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy >>>>>>>> >>>>>>>> www.cineca.it Tel: +39 051 6171722 >>>>>>>> >>>>>>>> g.fatig...@cineca.it >>>>>>>> _______________________________________________ >>>>>>>> users mailing list >>>>>>>> us...@open-mpi.org >>>>>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>>>>>>> >>>>>>> _______________________________________________ >>>>>>> users mailing list >>>>>>> us...@open-mpi.org >>>>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>>>>>> >>>>>>> >>>>>>> >>>>>> -- >>>>>> Ing. Gabriele Fatigati >>>>>> >>>>>> CINECA Systems & Tecnologies Department >>>>>> >>>>>> Supercomputing Group >>>>>> >>>>>> Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy >>>>>> >>>>>> www.cineca.it Tel: +39 051 6171722 >>>>>> >>>>>> g.fatig...@cineca.it >>>>>> _______________________________________________ >>>>>> users mailing list >>>>>> us...@open-mpi.org >>>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>>>>> >>>>> _______________________________________________ >>>>> users mailing list >>>>> us...@open-mpi.org >>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>>>> >>>>> >>>>> >>>> >>>> >>>> >>> >>> -- >>> stephen.wor...@sophia.inria.fr >>> 2004 route des lucioles - BP93 >>> Sophia Antipolis >>> 06902 CEDEX >>> >>> Tel: 04 92 38 50 54 >>> Fax: 04 97 15 53 51 >>> >>> >>> _______________________________________________ >>> users mailing list >>> us...@open-mpi.org >>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>> >> >> >> > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > >
-- Ing. Gabriele Fatigati CINECA Systems & Tecnologies Department Supercomputing Group Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy www.cineca.it Tel: +39 051 6171722 g.fatig...@cineca.it
