测试参数：
sysbench --test=/root/sysbench0.5/sysbench/tests/db/insert.lua
--mysql-table-engine=innodb --oltp-table-size=1000000
--max-requests=0 --max-time=300 --num-threads=16
--oltp-tables-count=10 --report-interval=10
--mysql-host=10.8.8.100 --mysql-port=3312 --mysql-user=admin
--mysql-password=123456 --mysql-db=test run
10张100万行表，并发16个线程，纯插入操作。
MySQL参数：
sync_binlog = 0
innodb_flush_log_at_trx_commit = 0
innodb_flush_method = O_DIRECT
innodb_flush_neighbors = 1
innodb_buffer_pool_size = 10G
innodb_io_capacity = 500
innodb_log_file_size = 512M
innodb_log_files_in_group = 3
innodb_log_buffer_size = 16M
普通复制延迟：
Master_Log_File: mysql-bin.000004
Read_Master_Log_Pos: 567748597
Relay_Log_File: host-100-relay-bin.000005
Relay_Log_Pos: 66853042
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 469504741
还剩1117MB没追完
MariaDB [(none)]> select 1024-469504741/1024/1024+567748597/1024/1024;
+----------------------------------------------+
| 1024-469504741/1024/1024+567748597/1024/1024 |
+----------------------------------------------+
| 1117.69264221 |
+----------------------------------------------+
1 row in set (0.00 sec)
并行复制（8个并发线程，未开启GTID模式）延迟：
Master_Log_File: mysql-bin.000022
Read_Master_Log_Pos: 333773843
Relay_Log_File: host-100-relay-bin.000073
Relay_Log_Pos: 134217580
Relay_Master_Log_File: mysql-bin.000021
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 722396020
还剩653MB没追完
MariaDB [(none)]> select 1024-722396020/1024/1024+333773843/1024/1024;
+----------------------------------------------+
| 1024-722396020/1024/1024+333773843/1024/1024 |
+----------------------------------------------+
| 653.38101101 |
+----------------------------------------------+
1 row in set (0.00 sec)
并行复制（8个并发线程，开启GTID模式）延迟：
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 365095829
Relay_Log_File: host-100-relay-bin.000008
Relay_Log_Pos: 134217572
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 811005100
还剩598MB没追完
MariaDB [(none)]> select 1024-811005100/1024/1024+365095829/1024/1024;
+----------------------------------------------+
| 1024-811005100/1024/1024+365095829/1024/1024 |
+----------------------------------------------+
| 598.74778080 |
+----------------------------------------------+
1 row in set (0.00 sec)
结论：
在我这个测试中，并行复制的速度要快于普通复制的两倍多。
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mariadb并行复制MySQL优化