hi!
Another plugin that should be disabled is QUERY_RESPONSE_TIME. It has quite some impact on LOCK_plugin:
-DWITH_QUERY_RESPONSE_TIME=1
+-----------------------------------------+------------+-----------------+ | event_name | count_star | sum_timer_wait | +-----------------------------------------+------------+-----------------+ | wait/synch/mutex/sql/LOCK_open | 2743723 | 160451183703111 | | wait/synch/mutex/mysys/THR_LOCK::mutex | 2743651 | 19122327109683 | | wait/synch/mutex/sql/LOCK_plugin | 3135747 | 18611700478728 | | wait/synch/rwlock/sql/LOCK_tdc | 1356784 | 1360918935810 |
-DWITHOUT_QUERY_RESPONSE_TIME=1
completely removes LOCK_plugin from the top 20 list. This is also considered a bug as the plugin API should be lightweight.
Should the "SET GLOBAL query_response_time_stats=0" solve this contention problem? or the LOCK_plugin is called always, doesn't matter if it's "disabled" or not? -- Roberto Spadim