Comments on: Found an Ideal I/O Scheduler for my MySQL boxes http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/ Yet Another Admin's blog Thu, 04 Feb 2010 07:58:50 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: pligg.com http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/comment-page-1/#comment-231375 pligg.com Thu, 18 Mar 2010 12:18:00 +0000 http://blog.kovyrin.net/?p=129#comment-231375 <strong>mysql :: Homo-Adminus Blog by Alexey Kovyrin...</strong> Disk IO performance... mysql :: Homo-Adminus Blog by Alexey Kovyrin…

Disk IO performance…

]]> By: Илья http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/comment-page-1/#comment-231090 Илья Thu, 18 Mar 2010 11:11:00 +0000 http://blog.kovyrin.net/?p=129#comment-231090 Спасибо!очнь интересная статья! Спасибо!очнь интересная статья!

]]> By: 选择合适的IO Scheduler，获得更高性能Mysql环境 | Coder,肖德时的个人BLOG http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/comment-page-1/#comment-230993 选择合适的IO Scheduler，获得更高性能Mysql环境 | Coder,肖德时的个人BLOG Thu, 18 Mar 2010 10:53:00 +0000 http://blog.kovyrin.net/?p=129#comment-230993 [...] ="http://coderchina.72pines.com/feed/"; 刚读一Mysql DBA写的文章受到提示，知道了Linux下的IO [...] [...] =”http://coderchina.72pines.com/feed/”; 刚读一Mysql DBA写的文章受到提示，知道了Linux下的IO [...]

]]> By: Marcelb http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/comment-page-1/#comment-230878 Marcelb Thu, 18 Mar 2010 13:28:00 +0000 http://blog.kovyrin.net/?p=129#comment-230878 Link to the conference: http://video.google.com/videoplay?docid=-6304964351441328559 Link to the conference:
http://video.google.com/videoplay?docid=-6304964351441328559

]]> By: Scoundrel http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/comment-page-1/#comment-230800 Scoundrel Thu, 18 Mar 2010 23:19:00 +0000 http://blog.kovyrin.net/?p=129#comment-230800 2Yordan: There were 8 separate threads in our "database load generation tool" (sphinx indexer) + some number of requests is being done from the site directly. 2Yordan: There were 8 separate threads in our “database load generation tool” (sphinx indexer) + some number of requests is being done from the site directly.

]]> By: Yordan http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/comment-page-1/#comment-230794 Yordan Thu, 18 Mar 2010 07:52:00 +0000 http://blog.kovyrin.net/?p=129#comment-230794 what is the number of threads in mysqld? what is the number of threads in mysqld?

]]> By: Scoundrel http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/comment-page-1/#comment-230789 Scoundrel Thu, 18 Mar 2010 18:55:00 +0000 http://blog.kovyrin.net/?p=129#comment-230789 2.6.18-53.el5 2.6.18-53.el5

]]> By: Kostas Georgiou http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/comment-page-1/#comment-230785 Kostas Georgiou Thu, 18 Mar 2010 17:47:00 +0000 http://blog.kovyrin.net/?p=129#comment-230785 Well there isn't much that the I/O schedulers can do if your access pattern is quite random beyond maybe giving you better average latencies . Running cfq with slice_idle=0 might be a good idea btw, keeping the disks idle for up to slice_idle (8ms by default) isn't probably the best option for a db workload. It would be interesting to get some plots/movies from seekwatcher also, I find that it gives you a nice insight on your workload and how each scheduler is affecting it. Well there isn’t much that the I/O schedulers can do if your access pattern is quite random beyond maybe giving you better average latencies .

Running cfq with slice_idle=0 might be a good idea btw, keeping the disks idle for up to slice_idle (8ms by default) isn’t probably the best option for a db workload.

It would be interesting to get some plots/movies from seekwatcher also, I find that it gives you a nice insight on your workload and how each scheduler is affecting it.

]]> By: Yordan http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/comment-page-1/#comment-230784 Yordan Thu, 18 Mar 2010 17:43:00 +0000 http://blog.kovyrin.net/?p=129#comment-230784 Kernel version? Kernel version?

]]> By: Me http://kovyrin.net/2008/07/20/found-an-ideal-io-scheduler-for-my-mysql-boxes/comment-page-1/#comment-230779 Me Thu, 18 Mar 2010 14:35:00 +0000 http://blog.kovyrin.net/?p=129#comment-230779 echo 1 > /proc/sys/vm/drop_caches echo 1 > /proc/sys/vm/drop_caches

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