Hello, Please run "lstopo -.synthetic" to compress the output a lot. I will be > able to reuse it from here and understand your binding mask. > Package:2 [NUMANode(memory=270369247232)] L3Cache:8(size=33554432) L2Cache:8(size=524288) L1dCache:1(size=32768) L1iCache:1(size=32768) Core:1 PU:2(indexes=2*128:1*2)
Mike Am Di., 1. März 2022 um 19:05 Uhr schrieb Brice Goglin < brice.gog...@inria.fr>: > > Le 01/03/2022 à 17:34, Mike a écrit : > > Hello, > > Usually you would rather allocate and bind at the same time so that the >> memory doesn't need to be migrated when bound. However, if you do not touch >> the memory after allocation, pages are not actually physically allocated, >> hence there's no to migrate. Might work but keep this in mind. >> > > I need all the data in one allocation, so that is why I opted to allocate > and then bind via the area function. The way I understand it is that by > using the memory binding policy HWLOC_MEMBIND_BIND with > hwloc_set_area_membind() the pages will actually get allocated on the > specified cores. If that is not the case I suppose the best solution would > be to just touch the allocated data with my threads. > > > set_area_membind() doesn't allocate pages, but it tells the operating > system "whenever you allocate them, do it on that NUMA node". Anyway, what > you're doing makes sense. > > > > Can you print memory binding like below instead of printing only the first >> PU in the set returned by get_area_membind? >> > char *s; > hwloc_bitmap_asprintf(&s, set); > /* s is now a C string of the bitmap, use it in your std::cout line */ > > I tried that and now get_area_membind returns that all memory is bound to > 0xffffffff,0xffffffff,,,0xffffffff,0xffffffff > > > Please run "lstopo -.synthetic" to compress the output a lot. I will be > able to reuse it from here and understand your binding mask. > Brice > > > _______________________________________________ > hwloc-users mailing list > hwloc-users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/hwloc-users
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