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[jira] [Created] (ARROW-2569) [C++] Improve thread pool size heuristic

Antoine Pitrou created ARROW-2569:

             Summary: [C++] Improve thread pool size heuristic
                 Key: ARROW-2569
                 URL: https://issues.apache.org/jira/browse/ARROW-2569
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Antoine Pitrou

We currently use the number of available HW threads as the default thread pool size for CPU-bound tasks. We should also examine well-known environment variables such as {{OMP_NUM_THREADS}}. Some discussion here: https://bugs.python.org/issue32986

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