.. SPDX-FileCopyrightText: 2019-2021 Intel Corporation .. .. SPDX-License-Identifier: CC-BY-4.0 ============== info Namespace ============== **[info_namespace]** Interfaces to query information about execution environment. .. code:: cpp // Declared in header namespace oneapi { namespace tbb { using numa_node_id = /*implementation-defined*/; using core_type_id = /*implementation-defined*/; namespace info { std::vector numa_nodes(); std::vector core_types(); int default_concurrency(task_arena::constraints c); int default_concurrency(numa_node_id id = oneapi::tbb::task_arena::automatic); } } // namespace tbb } // namespace oneapi Types ----- ``numa_node_id`` - Represents NUMA node identifier. Functions --------- .. cpp:function:: std::vector numa_nodes() Returns the vector of integral indexes that indicate available NUMA nodes. .. note:: If error occurs during system topology parsing, returns vector containing single element that equals to ``task_arena::automatic``. .. cpp:function:: std::vector core_types() Returns the vector of integral indexes that indicate available core types. The indexes are sorted from the least performant to the most performant core type. .. note:: If error occurs during system topology parsing, returns vector containing single element that equals to ``task_arena::automatic``. .. cpp:function:: int default_concurrency(task_arena::constraints c) Returns concurrency level for the given constraints. .. cpp:function:: int default_concurrency(numa_node_id id = oneapi::tbb::task_arena::automatic) Returns concurrency level of the given NUMA node. If argument is not specified, returns default concurrency level for current library configuration.