hwloc (Hardware Locality) 2.5.0 is now available for download.
https://www.open-mpi.org/software/hwloc/v2.5/ v2.5.0 is a fairly big release with 3 major topics: * NVIDIA NVLink and AMD XGMI bandwidth matrices between GPUs. The distances API has been extended to make them convenient to consult but we may add more helpers based user feedback. * A new "levelzero" backend for Intel oneAPI L0 devices. GPU distances will be added in the future. * New topology flags to mitigate spurious binding changes during hwloc discovery on Windows. The following is a summary of the changes since v2.4.0. Version 2.5.0 ------------- * API + Add hwloc/windows.h to query Windows processor groups. + Add hwloc_get_obj_with_same_locality() to convert between objects with same locality, for instance NUMA nodes and Packages, or OS devices within a PCI device. + Add hwloc_distances_transform() to modify distances structures. - hwloc-annotate and lstopo have new distances-transform options. + hwloc_distances_add() is replaced with _add_create() followed by _add_values() and _add_commit(). See hwloc/distances.h for details. + Add topology flags to mitigate binding modifications during hwloc discovery, especially on Windows: - HWLOC_TOPOLOGY_FLAG_RESTRICT_TO_CPUBINDING and _MEMBINDING restrict discovery to PUs and NUMA nodes inside the binding. - HWLOC_TOPOLOGY_FLAG_DONT_CHANGE_BINDING prevents from ever changing the binding during discovery. * Backends + Add a levelzero backend for oneAPI L0 devices, exposed as OS devices of subtype "LevelZero" and name such as "ze0". - Add hwloc/levelzero.h for interoperability between converting between L0 API devices and hwloc cpusets or OS devices. + Expose NEC Vector Engine cards on Linux as OS devices of subtype "VectorEngine" and name "ve0", etc. Thanks to Anara Kozhokanova, Tim Cramer and Erich Focht for the help. + Add a NVLinkBandwidth distances structure between NVIDIA GPUs (and POWER processor or NVSwitches) in the NVML backend, and a XGMIBandwidth distances structure between AMD GPUs in the RSMI backends. - See "Topology Attributes: Distances, Memory Attributes and CPU Kinds" in the documentation for details about these new distances. + Add support for NUMA node 0 being offline in Linux, thanks to Jirka Hladky. * Build + Add --with-cuda-version=<version> or look at the CUDA_VERSION environment variable to find the appropriate CUDA pkg-config files. Thanks to Stephen Herbein for the suggestion. - Also add --with-cuda=<dir> to specify the CUDA installation path manually (and its NVML and OpenCL components). Thanks to Andrea Bocci for the suggestion. - See "How do I enable CUDA and select which CUDA version to use?" in the FAQ for details. * Tools + lstopo now has a --windows-processor-groups option on Windows. + hwloc-ps now has a --short-name option to avoid long/truncated command path. + hwloc-ps now has a --single-ancestor option to return a single (possibly too large) object where a process is bound. + hwloc-ps --pid-cmd may now query environment variables, including MPI-specific variables to find out process ranks. Changes since rc1 are only minor fixes. -- Brice
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