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Re: MySQL 5.6 update doubled IOs
Posted by: Christian Meisinger
Date: March 26, 2013 08:29AM

The Disk IOs graph shows MySQL 5.5 and 5.6.
http://www.livingliquid.com/at/images/mysql/mysql56-data_root-week.png
Before 11 o'clock it's version 5.5, after 11 it's version 5.6.

Here is a monthly overview: Disk IOs monthly: http://www.livingliquid.com/at/images/mysql/mysql55_mysql56-data_root-month.png
Between week 10 and 11 i've update from 5.5 to 5.6.

Right now the VM has 4 CPUs, 12G RAM and ext4 for all partitions (/, mysql-data, mysql-logs).

Database size:
~ 30G MyISAM tables
~ 4G InnoDB tables

my.cnf: http://www.livingliquid.com/at/images/mysql/mysql56_my.cnf

More graphs:
- Bin/Relay log: http://www.livingliquid.com/at/images/mysql/mysql55_mysql56-bin_relay_log-month.png
- InnoDB buffer pool: http://www.livingliquid.com/at/images/mysql/mysql55_mysql56-innodb_bpool-month.png
- InnoDB IO pending: http://www.livingliquid.com/at/images/mysql/mysql55_mysql56-innodb_io_pend-month.png
- InnoDB IOs: http://www.livingliquid.com/at/images/mysql/mysql55_mysql56-innodb_io-month.png
- InnoDB log: http://www.livingliquid.com/at/images/mysql/mysql55_mysql56-innodb_log-month.png
- InnoDB row ops: http://www.livingliquid.com/at/images/mysql/mysql55_mysql56-innodb_rows-month.png
- Memory usage: http://www.livingliquid.com/at/images/mysql/mysql55_mysql56-memory-month.png
- Query types: http://www.livingliquid.com/at/images/mysql/mysql55_mysql56-queries-month.png


Our DEVs told me they altered 3 tables from MyISAM to InnoDB after the upgrade. About 1G in total.
I understand that InnoDB IOs increased but IOs for "MyISAM" should have decreased and ultimately total IOs should at least stay the same?

I tried to increase innodb_buffer_pool_size and innodb_log_buffer_size. No change.


About my "5.6 seems to be a little bit slower" statement: i was told 5.6 will be faster.
I think this is true on a bigger MySQL server with much more load and threads?
On smaller installations like ours it's slower. I've no graph here.
I logged a few statements from production servers and run them again comparing 5.5 with 5.6 on a dev-machine.
About -15% for version 5.6.


Thanks a lot for your feedback :)



Edited 1 time(s). Last edit at 03/26/2013 08:38AM by Christian Meisinger.

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