On Sep 22, 2014, at 4:58 PM, Jeff Squyres (jsquyres) <jsquy...@cisco.com> wrote:
> On Sep 22, 2014, at 6:55 PM, Brice Goglin <brice.gog...@inria.fr> wrote: > >>> HWLOC already provides similar info for processors and mother boards, so it >>> seemed a natural extension of current capabilities to provide it for other >>> system elements. >> >> Disk vendor/model is easy to add from sysfs on Linux. I don't know where >> to find the serial number. Spindle speed may require more than just >> sysfs. Do you have more info on how to get these attributes? >> >> For memory, we currently have a single memory object for all DIMMs of a >> single NUMA node. Adding multiple objects may not be useful, but adding >> many serials to a single NUMA object may be ugly. >> There are some information about physical memory in >> /sys/devices/system/node/node0/memory* but it doesn't correspond to >> DIMMs (I have 135 of them on my laptop for only 2 SODIMMs). dmidecode >> gets DIMM info somehow. > > Back in Nehalem days, it wasn't possible to map Linux kernel "physical" > memory back to individual DIMMs (because the BIOS could/would introduce > another layer of kernel<-->DIMM mapping that the kernel might not be aware > of). > > Has that changed? I don't think so, no - at least, I'm not sure you can map a specific DIMM to a specific address within a NUMA region. However, we can at least add the DIMMs to the root-object attributes. In addition, you can certainly map a DIMM to a specific DIMM socket, and I believe that means you can map it to a given NUMA region even if you can't say *where* it is within that region. Have to verify that. > > -- > Jeff Squyres > jsquy...@cisco.com > For corporate legal information go to: > http://www.cisco.com/web/about/doing_business/legal/cri/ > > _______________________________________________ > hwloc-devel mailing list > hwloc-de...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-devel > Link to this post: > http://www.open-mpi.org/community/lists/hwloc-devel/2014/09/4229.php
