Bug#35164: Large number of invalid pthread_attr_setschedparam calls
Bug#37536: Thread scheduling causes performance degradation at low thread count Deprecated --skip-thread-priority startup option as newer versions of the server won't change the thread priorities by default. Giving threads different priorities might yield marginal improvements in some platforms (where it actually works) but on the other hand it might cause significant degradation depending on the thread count and number of processors. Meddling with the thread priorities is a not a safe bet as it is very dependent on the behavior of the cpu scheduler and system where MySQL is being run. From MySQL 6.0 and up the default behavior is that of not modifying the threads priorities. sql/mysqld.cc: Deprecate --skip-thread-priority
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