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Code Activity

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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45
mysql-test/r/connect2.result Normal file
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SET @old_debug= @@session.debug;
set @old_thread_cache_size=@@global.thread_cache_size;
select 1;
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set global debug_dbug='+d,simulate_failed_connection_1';
connect(localhost,root,,test,MASTER_PORT,MASTER_SOCKET);
ERROR HY000: Lost connection to MySQL server at 'reading initial communication packet', system error: 95 "Operation not supported"
set global debug_dbug=@old_debug;
set global debug_dbug='+d,simulate_failed_connection_2';
connect(localhost,root,,test,MASTER_PORT,MASTER_SOCKET);
ERROR HY000: Lost connection to MySQL server at 'reading initial communication packet', system error: 95 "Operation not supported"
set global debug_dbug=@old_debug;
select 1;
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1
select 1;
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set global debug_dbug='+d,simulate_failed_connection_1';
connect(localhost,root,,test,MASTER_PORT,MASTER_SOCKET);
ERROR HY000: Lost connection to MySQL server at 'reading initial communication packet', system error: 95 "Operation not supported"
set global debug_dbug=@old_debug;
set global debug_dbug='+d,simulate_failed_connection_2';
connect(localhost,root,,test,MASTER_PORT,MASTER_SOCKET);
ERROR HY000: Lost connection to MySQL server at 'reading initial communication packet', system error: 95 "Operation not supported"
set global debug_dbug=@old_debug;
select 1;
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set @@global.thread_cache_size=2;
select 1;
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select 1;
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set global debug_dbug='+d,simulate_failed_connection_2';
connect(localhost,root,,test,MASTER_PORT,MASTER_SOCKET);
ERROR HY000: Lost connection to MySQL server at 'reading initial communication packet', system error: 95 "Operation not supported"
show status like "Threads_connected";
Variable_name Value
Threads_connected 1
set global debug_dbug=@old_debug;
set global thread_cache_size=@old_thread_cache_size;