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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.
Before 11 o'clock it's version 5.5, after 11 it's version 5.6.

Here is a monthly overview: Disk IOs monthly:
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


More graphs:
- Bin/Relay log:
- InnoDB buffer pool:
- InnoDB IO pending:
- InnoDB IOs:
- InnoDB log:
- InnoDB row ops:
- Memory usage:
- Query types:

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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Written By
March 20, 2013 08:52AM
Re: MySQL 5.6 update doubled IOs
March 26, 2013 08:29AM
March 27, 2013 11:44PM
March 28, 2013 07:49PM
April 02, 2013 12:20AM
April 02, 2013 09:57PM
April 10, 2013 08:31AM

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