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.000004Read_Master_Log_Pos: 567748597Relay_Log_File: host-100-relay-bin.000005Relay_Log_Pos: 66853042Relay_Master_Log_File: mysql-bin.000003Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0Last_Error: Skip_Counter: 0Exec_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.000022Read_Master_Log_Pos: 333773843Relay_Log_File: host-100-relay-bin.000073Relay_Log_Pos: 134217580Relay_Master_Log_File: mysql-bin.000021Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0Last_Error: Skip_Counter: 0Exec_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.000002Read_Master_Log_Pos: 365095829Relay_Log_File: host-100-relay-bin.000008Relay_Log_Pos: 134217572Relay_Master_Log_File: mysql-bin.000001Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0Last_Error: Skip_Counter: 0Exec_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。