Re: [OMPI users] Memory mapped memory
Hello, I have tried to run the executable "wrf.exe", using mpirun -machinefile /tmp/108388.1.par2/machines -np 4 wrf.exe but, I've got the following error: -- mpirun noticed that process rank 1 with PID 9942 on node part031.u-bourgogne.fr exited on signal 11 (Segmentation fault). -- 11.54s real 6.03s user 0.32s system Starter(9908): Return code=139 Starter end(9908) Thanks for your help Mouhamad Alsayed
Re: [OMPI users] Memory mapped memory
Sure, this is possible and generally works, although it is not defined by the MPI standard. Regular shared memory rules apply: you may have to add additional memory consistency and/or synchronization calls depending on your platform to ensure that MPI sees intended data updates. Best, ~Jim. On 10/17/2011 09:09 AM, Durga Choudhury wrote: > If the mmap() pages are created with MAP_SHARED, then they should be > sharable with other processes in the same node, isn't it? MPI > processes are just like any other process, aren't they? Will one of > the MPI Gurus please comment? > > Regards > Durga > > > On Mon, Oct 17, 2011 at 9:45 AM, Gabriele Fatigati > wrote: >> More in detail, >> is it possible use mmap() function from MPI process and sharing these memory >> between others processes? >> >> 2011/10/13 Gabriele Fatigati >>> >>> Dear OpenMPI users and developers, >>> is there some limitation or issues to use memory mapped memory into MPI >>> processes? I would like to share some memory in a node without using OpenM. >>> Thanks a lot. >>> >>> -- >>> Ing. Gabriele Fatigati >>> >>> HPC specialist >>> >>> SuperComputing Applications and Innovation Department >>> >>> Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy >>> >>> www.cineca.itTel: +39 051 6171722 >>> >>> g.fatigati [AT] cineca.it >> >> >> >> -- >> Ing. Gabriele Fatigati >> >> HPC specialist >> >> SuperComputing Applications and Innovation Department >> >> Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy >> >> www.cineca.itTel: +39 051 6171722 >> >> g.fatigati [AT] 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
Re: [OMPI users] Memory mapped memory
If the mmap() pages are created with MAP_SHARED, then they should be sharable with other processes in the same node, isn't it? MPI processes are just like any other process, aren't they? Will one of the MPI Gurus please comment? Regards Durga On Mon, Oct 17, 2011 at 9:45 AM, Gabriele Fatigati wrote: > More in detail, > is it possible use mmap() function from MPI process and sharing these memory > between others processes? > > 2011/10/13 Gabriele Fatigati >> >> Dear OpenMPI users and developers, >> is there some limitation or issues to use memory mapped memory into MPI >> processes? I would like to share some memory in a node without using OpenM. >> Thanks a lot. >> >> -- >> Ing. Gabriele Fatigati >> >> HPC specialist >> >> SuperComputing Applications and Innovation Department >> >> Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy >> >> www.cineca.it Tel: +39 051 6171722 >> >> g.fatigati [AT] cineca.it > > > > -- > Ing. Gabriele Fatigati > > HPC specialist > > SuperComputing Applications and Innovation Department > > Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy > > www.cineca.it Tel: +39 051 6171722 > > g.fatigati [AT] cineca.it > > ___ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
Re: [OMPI users] Memory mapped memory
More in detail, is it possible use mmap() function from MPI process and sharing these memory between others processes? 2011/10/13 Gabriele Fatigati > Dear OpenMPI users and developers, > > is there some limitation or issues to use memory mapped memory into MPI > processes? I would like to share some memory in a node without using OpenM. > > Thanks a lot. > > -- > Ing. Gabriele Fatigati > > HPC specialist > > SuperComputing Applications and Innovation Department > > Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy > > www.cineca.itTel: +39 051 6171722 > > g.fatigati [AT] cineca.it > -- Ing. Gabriele Fatigati HPC specialist SuperComputing Applications and Innovation Department Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy www.cineca.itTel: +39 051 6171722 g.fatigati [AT] cineca.it
