From: mperham@... Date: 2021-01-20T20:25:26+00:00 Subject: [ruby-core:102185] [Ruby master Feature#17566] Tune thread QoS / efficiency on macOS Issue #17566 has been reported by mperham (Mike Perham). ---------------------------------------- Feature #17566: Tune thread QoS / efficiency on macOS https://bugs.ruby-lang.org/issues/17566 * Author: mperham (Mike Perham) * Status: Open * Priority: Normal ---------------------------------------- Hi, new Apple M1 processors have "performance" and "efficiency" cores. Apple provides a QoS API so threads can tune which cores they should execute on. Some threads should be executed as high-priority, some should be treated as low-priority. This page shows the pthread APIs that Apple provides: https://developer.apple.com/library/archive/documentation/Performance/Conceptual/power_efficiency_guidelines_osx/PrioritizeWorkAtTheTaskLevel.html ``` pthread_set_qos_class_self_np(QOS_CLASS_BACKGROUND, 0) ``` I noticed Ruby already provides `Thread#priority=` which says `This is just hint for Ruby thread scheduler. It may be ignored on some platform`. Does this API work still or was it only active for Ruby 1.8's green threads? Should this API use the QoS APIs on macOS? -- https://bugs.ruby-lang.org/ Unsubscribe: