Comments on: MySQL 5.5.4 in tpcc-like workload

By: Sac a main pas cher

Sac a main pas cher — Mon, 25 Jul 2011 07:48:42 +0000

Vadim, any idea what is going on with the ioc500 graph in Percona Server in the graphs linked from your comment #14 above?

By: angel

angel — Tue, 12 Apr 2011 12:24:12 +0000

Je l’aime beaucoup, Merci pour le partage

By: Vadim

Vadim — Mon, 10 May 2010 01:05:30 +0000

Dimitri,

I posted results with innodb_io_capacity=500 and 2000 for MySQL 5.5.4.
http://www.percona.com/docs/wiki/benchmark:mysql:554-tpcc:start#io_capacity_for_bp_24gb_mysql_554

So when data fits into memory ( buffer_pool=24Gb), it seems innodb_io_capacity=2000 will help to avoid periodical drops in MySQL 5.5.4.

It does not help though when buffer_pool is smaller than dataset.

By: Dimitri

Dimitri — Sat, 24 Apr 2010 17:28:20 +0000

@Peter – I think the solution with IO capacity will be still more light than any other.. as well extremely simple and easily applicable Specially with all incoming SSD base solutions we’ll save a huge amount of CPU cycles.. But well – it’s my opinion, and I’m not ready to change it until you don’t present me another working solution

@Vadim – Agree to connect to your server and try to analyze together – let’s get in contact on Monday (by mail or skype) – I’ll also need another Linux host/PC to setup dim_STAT and fully monitor your workload.. (let’s get it off-list)

I’m very curious to understand what’s going wrong here..

Rgds,
-Dimitri

By: Vadim

Vadim — Sat, 24 Apr 2010 16:18:52 +0000

Baron,

No I do not have clear explanation…

By: Baron Schwartz

Baron Schwartz — Sat, 24 Apr 2010 12:51:05 +0000

Vadim, any idea what is going on with the ioc500 graph in Percona Server in the graphs linked from your comment #14 above?

By: Vadim

Vadim — Sat, 24 Apr 2010 04:02:07 +0000

pingshan,

For 5.0 we have Percona-Server-5.0 which shows comparable performance with XtraDB.

By: pingshan

pingshan — Sat, 24 Apr 2010 03:31:01 +0000

I am still using MySQL5.0.x

By: Vadim

Vadim — Fri, 23 Apr 2010 23:00:10 +0000

Dimitri,

I posted graphs with different io_capacity for 10GB buffer_pool here:
http://www.percona.com/docs/wiki/benchmark:mysql:554-tpcc:start#io_capacity_variations

we may find that io_capacity=1000 is somewhat better, but not dramatically.

You are pretty much welcome to repeat results on my box with FusionIO cards, I can give you access.

By: Vadim

Vadim — Fri, 23 Apr 2010 15:49:03 +0000

Peter,

asynchronous IO is “on” by default in 5.5.4 so I tested with it.

Also I used “fast_cheksums” in XtraDB, but I see it does not affect results so much (couple percents)