Le 01/10/2020 à 19:16, Jirka Hladky a écrit : > Hi Brice, > > this new feature sounds very interesting! > > Add hwloc/memattrs.h for exposing latency/bandwidth information > between initiators (CPU sets for now) and target NUMA nodes, > typically on heterogeneous platforms. > > > If I get it right, I need to have an ACPI HMAT table on the system to > use the new functionality, right?
Hello Jirka It's also possible to add memory attribute using the C API or with hwloc-annotate to modify a XML (you may create attribute, or add values for a given attribute). > I have tried following on Fedora > acpidump -o acpidump.bin > acpixtract -a acpidump.bin > > but there is no HMAT table reported. So it seems I'm out of luck, and > I cannot test the new functionality, right? Besides KNL (which is too old to have HMAT, but hwloc now provides hardwired bandwidth/latency values), the only platforms with heterogeneous memories right now are Intel machines with Optane DCPMM (NVDIMMs). Some have a HMAT, some don't. If your machine doesn't, it's possible to provide a custom HMAT table in the initrd. That's not easy, so adding attribute values with hwloc-annotate might be easier. > > Also, where can we find the list of attributes supported > by --best-memattr? > --best-memattr <attr> Only display the best target among the local nodes There are 4 standard attributes defined in hwloc/memattrs.h: capacity, locality, latency and bandwidth.They are also visible in lstopo -vv or lstopo --memattrs. I'll something in the doc. > > By trial and error, I have found out that latency and bandwidth are > supported. Are there any other? Could you please add the list to > hwloc-info -h? I could add the default ones, but I'll need to specify that additional user-given attributes may exist. Thanks for the feedback. Brice > > hwloc-info --best-memattr bandwidth > hwloc-info --best-memattr latency > > Thanks a lot! > Jirka > > > On Thu, Oct 1, 2020 at 12:45 AM Brice Goglin <brice.gog...@inria.fr > <mailto:brice.gog...@inria.fr>> wrote: > > hwloc (Hardware Locality) 2.3.0 is now available for download. > > https://www.open-mpi.org/software/hwloc/v2.3/ > <https://www.open-mpi.org/software/hwloc/v2.0/> > > v2.3.0 brings quite a lot of changes. The biggest one is the addition > of the memory attribute API to expose hardware information that vendors > are (slowly) adding to ACPI tables to describe heterogeneous memory > platforms (mostly DDR+NVDIMMs right now). > > The following is a summary of the changes since v2.2.0. > > Version 2.3.0 > ------------- > * API > + Add hwloc/memattrs.h for exposing latency/bandwidth information > between initiators (CPU sets for now) and target NUMA nodes, > typically on heterogeneous platforms. > - When available, bandwidths and latencies are read from the ACPI HMAT > table exposed by Linux kernel 5.2+. > - Attributes may also be customized to expose user-defined performance > information. > + Add hwloc_get_local_numanode_objs() for listing NUMA nodes that are > local to some locality. > + The new topology flag HWLOC_TOPOLOGY_FLAG_IMPORT_SUPPORT causes > support arrays to be loaded from XML exported with hwloc 2.3+. > - hwloc_topology_get_support() now returns an additional "misc" > array with feature "imported_support" set when support was imported. > + Add hwloc_topology_refresh() to refresh internal caches after > modifying > the topology and before consulting the topology in a multithread > context. > * Backends > + Add a ROCm SMI backend and a hwloc/rsmi.h helper file for getting > the locality of AMD GPUs, now exposed as "rsmi" OS devices. > Thanks to Mike Li. > + Remove POWER device-tree-based topology on Linux, > (it was disabled by default since 2.1). > * Tools > + Command-line options for specifying flags now understand > comma-separated > lists of flag names (substrings). > + hwloc-info and hwloc-calc have new --local-memory --local-memory-flags > and --best-memattr options for reporting local memory nodes and > filtering > by memory attributes. > + hwloc-bind has a new --best-memattr option for filtering by memory > attributes > among the memory binding set. > + Tools that have a --restrict option may now receive a nodeset or > some custom flags for restricting the topology. > + lstopo now has a --thickness option for changing line thickness in the > graphical output. > + Fix lstopo drawing when autoresizing on Windows 10. > + Pressing the F5 key in lstopo X11 and Windows graphical/interactive > outputs > now refreshes the display according to the current topology and > binding. > + Add a tikz lstopo graphical backend to generate picture easily > included into > LaTeX documents. Thanks to Clement Foyer. > * Misc > + The default installation path of the Bash completion file has changed > to > ${datadir}/bash-completion/completions/hwloc. Thanks to Tomasz > Kłoczko. > > > Changes since 2.3.0rc1 are negligible. > -- > Brice > > _______________________________________________ > hwloc-announce mailing list > hwloc-annou...@lists.open-mpi.org > <mailto:hwloc-annou...@lists.open-mpi.org> > https://lists.open-mpi.org/mailman/listinfo/hwloc-announce > > > > -- > -Jirka > > _______________________________________________ > hwloc-users mailing list > hwloc-users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/hwloc-users
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