An update: placing strerror(errno) after hwloc_set_area_membind_nodeset gives: "Cannot allocate memory"
2012/9/5 Gabriele Fatigati <g.fatig...@cineca.it> > Hi, > > I've noted that hwloc_set_area_membind_nodeset return -1 but errno is not > equal to EXDEV or ENOSYS. I supposed that these two case was the two unique > possibly. > > From the hwloc documentation: > > -1 with errno set to ENOSYS if the action is not supported > -1 with errno set to EXDEV if the binding cannot be enforced > > > Any other binding failure reason? The memory available is enought. > > 2012/9/5 Brice Goglin <brice.gog...@inria.fr> > >> Hello Gabriele, >> >> The only limit that I would think of is the available physical memory on >> each NUMA node (numactl -H will tell you how much of each NUMA node memory >> is still available). >> malloc usually only fails (it returns NULL?) when there no *virtual* >> memory anymore, that's different. If you don't allocate tons of terabytes >> of virtual memory, this shouldn't happen easily. >> >> Brice >> >> >> >> >> Le 05/09/2012 14:27, Gabriele Fatigati a écrit : >> >> Dear Hwloc users and developers, >> >> >> I'm using hwloc 1.4.1 on a multithreaded program in a Linux platform, >> where each thread bind many non contiguos pieces of a big matrix using in a >> very intensive way hwloc_set_area_membind_nodeset function: >> >> hwloc_set_area_membind_nodeset(topology, punt+offset, len, nodeset, >> HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_THREAD | HWLOC_MEMBIND_MIGRATE); >> >> Binding seems works well, since the returned code from function is 0 >> for every calls. >> >> The problems is that after binding, a simple little new malloc fails, >> without any apparent reason. >> >> Disabling memory binding, the allocations works well. Is there any >> knows problem if hwloc_set_area_membind_nodeset is used intensively? >> >> Is there some operating system limit for memory pages binding? >> >> Thanks in advance. >> >> -- >> 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 >> >> >> _______________________________________________ >> hwloc-users mailing >> listhwloc-users@open-mpi.orghttp://www.open-mpi.org/mailman/listinfo.cgi/hwloc-users >> >> >> > > > -- > 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
