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hwlocality...distribute(3) Library Functions Manual hwlocality...distribute(3) NAME hwlocality_helper_distribute - Distributing items over a topology SYNOPSIS Enumerations enum hwloc_distrib_flags_e { HWLOC_DISTRIB_FLAG_REVERSE } Functions int hwloc_distrib (hwloc_topology_t topology, hwloc_obj_t *roots, unsigned n_roots, hwloc_cpuset_t *set, unsigned n, int until, unsigned long flags) Detailed Description Enumeration Type Documentation enum hwloc_distrib_flags_e Flags to be given to hwloc_distrib(). Enumerator HWLOC_DISTRIB_FLAG_REVERSE Distrib in reverse order, starting from the last objects. Function Documentation int hwloc_distrib (hwloc_topology_t topology, hwloc_obj_t * roots, unsigned n_roots, hwloc_cpuset_t * set, unsigned n, int until, unsigned long flags) [inline] Distribute n items over the topology under roots. Array set will be filled with n cpusets recursively distributed linearly over the topology under ob- jects roots, down to depth until (which can be INT_MAX to distribute down to the finest level). n_roots is usually 1 and roots only contains the topology root object so as to distribute over the entire topology. This is typically useful when an application wants to distribute n threads over a machine, giving each of them as much private cache as possible and keeping them locally in number order. The caller may typically want to also call hwloc_bitmap_singlify() before binding a thread so that it does not move at all. flags should be 0 or a OR'ed set of hwloc_distrib_flags_e. Returns 0 on success, -1 on error. Note On hybrid CPUs (or asymmetric platforms), distribution may be subopti- mal since the number of cores or PUs inside packages or below caches may vary (the top-down recursive partitioning ignores these numbers un- til reaching their levels). Hence it is recommended to distribute only inside a single homogeneous domain. For instance on a CPU with energy- efficient E-cores and high-performance P-cores, one should distribute separately N tasks on E-cores and M tasks on P-cores instead of trying to distribute directly M+N tasks on the entire CPUs. This function requires the roots objects to have a CPU set. Author Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code. Hardware Locality (hwloc) Version 2.12.1 hwlocality...distribute(3)
NAME | SYNOPSIS | Detailed Description | Enumeration Type Documentation | Function Documentation | Author
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