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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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81
mysql-test/t/connect2.test Normal file
View File

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# This test is to check various cases of connections, some which require
# DBUG
# This test makes no sense with the embedded server
--source include/not_embedded.inc
--source include/have_debug.inc
SET @old_debug= @@session.debug;
set @old_thread_cache_size=@@global.thread_cache_size;
# Test connections to the
connect(con1,localhost,root,,test,,);
select 1;
disconnect con1;
connection default;
set global debug_dbug='+d,simulate_failed_connection_1';
--replace_result $MASTER_MYSOCK MASTER_SOCKET $MASTER_MYPORT MASTER_PORT
--error 2013
connect(con1,localhost,root,,test,,);
connection default;
set global debug_dbug=@old_debug;
set global debug_dbug='+d,simulate_failed_connection_2';
--replace_result $MASTER_MYSOCK MASTER_SOCKET $MASTER_MYPORT MASTER_PORT
--error 2013
connect(con1,localhost,root,,test,,);
connection default;
set global debug_dbug=@old_debug;
connect(con1,localhost,root,,test,,);
select 1;
disconnect con1;
# Test connections to the extra port.
connect(con1,localhost,root,,test,$MASTER_EXTRA_PORT,);
select 1;
disconnect con1;
connection default;
set global debug_dbug='+d,simulate_failed_connection_1';
--replace_result $MASTER_MYSOCK MASTER_SOCKET $MASTER_EXTRA_PORT MASTER_PORT
--error 2013
connect(con1,localhost,root,,test,$MASTER_EXTRA_PORT,);
connection default;
set global debug_dbug=@old_debug;
set global debug_dbug='+d,simulate_failed_connection_2';
--replace_result $MASTER_MYSOCK MASTER_SOCKET $MASTER_EXTRA_PORT MASTER_PORT
--error 2013
connect(con1,localhost,root,,test,$MASTER_EXTRA_PORT,);
connection default;
set global debug_dbug=@old_debug;
connect(con1,localhost,root,,test,$MASTER_EXTRA_PORT,);
select 1;
disconnect con1;
connection default;
#
# Test thread cache
#
set @@global.thread_cache_size=2;
connect(con1,localhost,root,,test,$MASTER_EXTRA_PORT,);
select 1;
connect(con2,localhost,root,,test,$MASTER_EXTRA_PORT,);
select 1;
disconnect con1;
disconnect con2;
connection default;
set global debug_dbug='+d,simulate_failed_connection_2';
--replace_result $MASTER_MYSOCK MASTER_SOCKET $MASTER_EXTRA_PORT MASTER_PORT
--error 2013
connect(con1,localhost,root,,test,$MASTER_EXTRA_PORT,);
connection default;
# Check that threads_connected didn't count aborted connections
show status like "Threads_connected";
#
# Cleanup
#
set global debug_dbug=@old_debug;
set global thread_cache_size=@old_thread_cache_size;