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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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16
sql/sql_repl.cc
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@ -2181,9 +2181,7 @@ static int init_binlog_sender(binlog_send_info *info,
linfo->pos= *pos;
// note: publish that we use file, before we open it
mysql_mutex_lock(&LOCK_thread_count);
thd->current_linfo= linfo;
mysql_mutex_unlock(&LOCK_thread_count);
if (check_start_offset(info, linfo->log_file_name, *pos))
return 1;
@ -2922,9 +2920,7 @@ err:
mysql_file_close(file, MYF(MY_WME));
}
mysql_mutex_lock(&LOCK_thread_count);
thd->current_linfo = 0;
mysql_mutex_unlock(&LOCK_thread_count);
thd->reset_current_linfo();
thd->variables.max_allowed_packet= old_max_allowed_packet;
delete info->fdev;
@ -3379,10 +3375,8 @@ err:
SYNOPSIS
kill_zombie_dump_threads()
slave_server_id the slave's server id
*/
void kill_zombie_dump_threads(uint32 slave_server_id)
{
mysql_mutex_lock(&LOCK_thread_count);
@ -3946,9 +3940,7 @@ bool mysql_show_binlog_events(THD* thd)
goto err;
}
mysql_mutex_lock(&LOCK_thread_count);
thd->current_linfo = &linfo;
mysql_mutex_unlock(&LOCK_thread_count);
thd->current_linfo= &linfo;
if ((file=open_binlog(&log, linfo.log_file_name, &errmsg)) < 0)
goto err;
@ -4080,9 +4072,7 @@ err:
else
my_eof(thd);
mysql_mutex_lock(&LOCK_thread_count);
thd->current_linfo = 0;
mysql_mutex_unlock(&LOCK_thread_count);
thd->reset_current_linfo();
thd->variables.max_allowed_packet= old_max_allowed_packet;
DBUG_RETURN(ret);
}