[ARROW-2479] [C++] Have a global thread pool

• Type: Wish
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.10.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/18684
• Assignee: Antoine Pitrou
• Reporter: Antoine Pitrou
• Created: 19/Apr/18 17:52
• Updated: 11/Jan/23 07:21
• Resolved: 10/May/18 15:47

Description

A few parts of Arrow have started spawning threads to parallelize CPU-bound tasks. They do so by launching a hard-coded number of threads, disregarding machine configuration or the fact that Arrow itself might be used from several threads at once (so hardcoding 8 threads might end up launch N * 8 threads if the user is calling Arrow from N threads at once...).

Instead we probably want a global thread pool policy, with a singleton thread pool for CPU-bound tasks (using, by default, a number of threads equal to the machine's capacity).

See discussion in https://github.com/apache/arrow/pull/1893

Issue Links

• links to: GitHub Pull Request #1953