使用O_DIRECT改善MySQL性能

Question

I want to increase the performance of MySQL. So I have done the configuration level changes to MySQL. I used innodb_flush_method = O_DIRECT , but insert rate is not increasing much. Normally, insertion rate is 650 inserts/sec. How do I know weather O_DIRECT is working properly.

I am using Ubuntu 14.04.1 server and MySQL v5.6. CPU Memory and Disk I/O rates are normal (I use RAID, 16 GB RAM, 8 CPU cores) I use WSO2 CEP for insertion. I have implement that part and measured using MySQL workbench. But I couldn't get much more performance though I increase the insertion rate through wSO2 CEP.

I have used following my.cnf.

my.cnf

[mysqld]
innodb_buffer_pool_size = 9G
query_cache_size = 128M
innodb_log_file_size = 1768M
innodb_flush_log_at_trx_commit = 0 
innodb_io_capacity = 1000
innodb_flush_method = O_DIRECT
max_heap_table_size = 536870912
innodb_lock_wait_timeout = 1
max_connections = 400
sort_buffer_size = 128M 
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
skip-host-cache
skip-name-resolve
event_scheduler=on

Answer 1

在这种情况下，如果您使用的是事件表，则较早的CEP / siddhi版本不会执行批量插入。.这可能是导致上述问题的原因。.在（最新的SNAPSHOT来源（Siddhi）中），我们已修复此问题。下一个版本的好数字。