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eb58939395
The problem from a user point of view was that on Solaris the time related functions (e.g. NOW(), SYSDATE(), etc) would always return a fixed time. This bug was happening due to a logic in the time retrieving wrapper function which would only call the time() function every half second. This interval between calls would be calculated using the gethrtime() and the logic relied on the fact that time returned by it is monotonic. Unfortunately, due to bugs in the gethrtime() implementation, there are some cases where the time returned by it can drift (See Solaris bug id 6600939), potentially causing the interval calculation logic to fail. Since newer versions of Solaris (10+) have alleviated the performance degradation associated with time(2), the solution is to simply directly rely on time() at each invocation. This simplification has an upside that it allows us to eliminate a lock which was used to control access to the variables used to track the half second interval, thus improving the overall scalability of timekeeping related functions (e.g. NOW()). Benchmarks runs have shown no significant degradation associated with this change. With this, there are actually improvements in performance for cases involving many connections. In summary, the changes introduced by this patch are: a) my_time() and my_micro_time_and_time() no longer use gethrtime(). Instead, time() and gettimeofdate() are used correspondingly. b) my_micro_time() is changed to not use gethrtime() so as to have the same time source as my_micro_time_and_time(). There shouldn't be any performance impact from this change since this function is used only a few times during statement execution and, on Solaris, gettimeofday() shows acceptable performance. mysys/my_getsystime.c: Use time() even if gethrtime() is available. Remove logic which relied on gethrtime() to only call time() every half second. Since gethrtime() is not used anymore, also remove it from my_micro_time() to keep a common time source. Also, function comments are cleaned up (fixed typos and wrong information) and converted to doxygen. mysys/my_thr_init.c: Remove mutex which is no longer used. mysys/mysys_priv.h: Remove mutex which is no longer used.
194 lines
5.3 KiB
Plaintext
194 lines
5.3 KiB
Plaintext
use performance_schema;
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/mysys/THR_LOCK_threads";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/mysys/THR_LOCK_malloc";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/mysys/THR_LOCK_open";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/mysys/THR_LOCK_isam";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/mysys/THR_LOCK_myisam";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/mysys/THR_LOCK_heap";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/mysys/THR_LOCK_net";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/mysys/THR_LOCK_charset";
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count(name)
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1
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select count(name) from cond_instances
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where name like "wait/synch/cond/mysys/THR_COND_threads";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_open";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_thread_count";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_status";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_error_log";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_delayed_insert";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_uuid_generator";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_delayed_status";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_delayed_create";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_crypt";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_slave_list";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_active_mi";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_manager";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_global_system_variables";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_user_conn";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_prepared_stmt_count";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_connection_count";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_server_started";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_rpl_status";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/Query_cache::structure_guard_mutex";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_event_queue";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_user_locks";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/Cversion_lock";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_audit_mask";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_xid_cache";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/LOCK_plugin";
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count(name)
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1
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select count(name) from mutex_instances
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where name like "wait/synch/mutex/sql/tz_LOCK";
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count(name)
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1
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select count(name) from rwlock_instances
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where name like "wait/synch/rwlock/sql/LOCK_grant";
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count(name)
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1
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select count(name) from rwlock_instances
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where name like "wait/synch/rwlock/sql/LOCK_sys_init_connect";
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count(name)
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1
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select count(name) from rwlock_instances
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where name like "wait/synch/rwlock/sql/LOCK_sys_init_slave";
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count(name)
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1
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select count(name) from rwlock_instances
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where name like "wait/synch/rwlock/sql/LOCK_system_variables_hash";
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count(name)
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1
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select count(name) from cond_instances
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where name like "wait/synch/cond/sql/COND_server_started";
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count(name)
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1
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select count(name) from cond_instances
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where name like "wait/synch/cond/sql/COND_refresh";
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count(name)
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0
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select count(name) from cond_instances
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where name like "wait/synch/cond/sql/COND_thread_count";
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count(name)
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1
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select count(name) from cond_instances
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where name like "wait/synch/cond/sql/COND_manager";
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count(name)
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1
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select count(name) from cond_instances
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where name like "wait/synch/cond/sql/COND_thread_cache";
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count(name)
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1
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select count(name) from cond_instances
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where name like "wait/synch/cond/sql/COND_flush_thread_cache";
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count(name)
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1
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select count(name) from cond_instances
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where name like "wait/synch/cond/sql/COND_rpl_status";
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count(name)
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1
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select count(name) from cond_instances
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where name like "wait/synch/cond/sql/Query_cache::COND_cache_status_changed";
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count(name)
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1
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select count(name) from cond_instances
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where name like "wait/synch/cond/sql/COND_queue_state";
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count(name)
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1
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