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MDEV-6150 Speed up connection speed by moving creation of THD to new thread

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Creating a CONNECT object on client connect and pass this to the working thread which creates the THD.
Split LOCK_thread_count to different mutexes
Added LOCK_thread_start to syncronize threads
Moved most usage of LOCK_thread_count to dedicated functions
Use next_thread_id() instead of thread_id++

Other things:
- Thread id now starts from 1 instead of 2
- Added cast for thread_id as thread id is now of type my_thread_id
- Made THD->host const (To ensure it's not changed)
- Removed some DBUG_PRINT() about entering/exiting mutex as these was already logged by mutex code
- Fixed that aborted_connects and connection_errors_internal are counted in all cases
- Don't take locks for current_linfo when we set it (not needed as it was 0 before)
This commit is contained in:
Monty
2016-02-01 12:45:39 +02:00
parent 076aa182c2
commit 3d4a7390c1
50 changed files with 878 additions and 551 deletions
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10
sql/rpl_parallel.cc
View File

@ -969,10 +969,8 @@ handle_rpl_parallel_thread(void *arg)
my_thread_init();
thd = new THD;
thd->thread_stack = (char*)&thd;
mysql_mutex_lock(&LOCK_thread_count);
thd->thread_id= thd->variables.pseudo_thread_id= thread_id++;
threads.append(thd);
mysql_mutex_unlock(&LOCK_thread_count);
thd->thread_id= thd->variables.pseudo_thread_id= next_thread_id();
add_to_active_threads(thd);
set_current_thd(thd);
pthread_detach_this_thread();
thd->init_for_queries();
@ -1372,10 +1370,10 @@ handle_rpl_parallel_thread(void *arg)
thd->reset_db(NULL, 0);
thd_proc_info(thd, "Slave worker thread exiting");
thd->temporary_tables= 0;
mysql_mutex_lock(&LOCK_thread_count);
THD_CHECK_SENTRY(thd);
unlink_not_visible_thd(thd);
delete thd;
mysql_mutex_unlock(&LOCK_thread_count);
mysql_mutex_lock(&rpt->LOCK_rpl_thread);
rpt->running= false;