Comments on: Getting real life query speeds with MySQL http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/ Everything about MySQL Performance Tue, 02 Dec 2008 12:08:48 +0000 http://wordpress.org/?v=2.5.1 By: peter http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-169584 peter Tue, 18 Sep 2007 20:40:56 +0000 http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-169584 If you do not want to restart MySQL you can set key_buffer_size to 0 and when back and do significant amount of full table scans to wipe of Innodb cache. It is less reliable anyway. If you do not want to restart MySQL you can set key_buffer_size to 0 and when back and do significant amount of full table scans to wipe of Innodb cache.

It is less reliable anyway.

]]> By: Bob http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-169084 Bob Mon, 17 Sep 2007 16:05:50 +0000 http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-169084 Could you expand on the less intrusive ways for clearing the OS and MySQL caches? I would like to avoid restarting MySQL if possible. Thanks Could you expand on the less intrusive ways for clearing the OS and MySQL caches? I would like to avoid restarting MySQL if possible.

Thanks

]]> By: All in a days work… http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-146488 All in a days work… Wed, 18 Jul 2007 02:29:38 +0000 http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-146488 [...] Getting real life query speeds with MySQL “need production load to warm it up or test warmup load”, well yea, but what’s the process? [...] [...] Getting real life query speeds with MySQL “need production load to warm it up or test warmup load”, well yea, but what’s the process? [...]

]]> By: peter http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-28901 peter Sun, 14 Jan 2007 00:36:16 +0000 http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-28901 Alexey, This assumes you do not have RAID, which has its own cache etc. But yes generally it is possible, but I do not think it is really worth to do it such way. Alexey,

This assumes you do not have RAID, which has its own cache etc. But yes generally it is possible, but I do not think it is really worth to do it such way.

]]> By: Alexey http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-28887 Alexey Sun, 14 Jan 2007 00:21:08 +0000 http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-28887 On recent linux kernels you can do: echo "3" > /proc/sys/vm/drop_caches to clear OS cache. If you also restart MySQL, comparing even a single query performance may give meaningful results. On recent linux kernels you can do:
echo “3″ > /proc/sys/vm/drop_caches
to clear OS cache.
If you also restart MySQL, comparing even a single query performance may give meaningful results.

]]> By: peter http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-27241 peter Thu, 11 Jan 2007 11:14:24 +0000 http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-27241 I agree JMeter is great. JMeter however does "Full Stack" benchmark loading HTTP Server, Application Server and then database server, this is of course required part of performance testing, but which adds complication if you're looking at particular queries and you want to check how their execution speed had changed. I agree JMeter is great.

JMeter however does “Full Stack” benchmark loading HTTP Server, Application Server and then database server, this is of course required part of performance testing, but which adds complication if you’re looking at particular queries and you want to check how their execution speed had changed.

]]> By: Nick http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-27207 Nick Thu, 11 Jan 2007 10:47:20 +0000 http://www.mysqlperformanceblog.com/2007/01/10/getting-real-life-query-speeds-with-mysql/#comment-27207 Interesting article as always :) Apache JMeter is an excellent tool for load testing a MySQL database. I tend to use it via HTTP requests to the website, which in turn will load up the MySQL database. http://jakarta.apache.org/jmeter/index.html This makes testing 'real world' conditions incredibly easy, and fairly accurate. Interesting article as always :)

Apache JMeter is an excellent tool for load testing a MySQL database. I tend to use it via HTTP requests to the website, which in turn will load up the MySQL database.

http://jakarta.apache.org/jmeter/index.html

This makes testing ‘real world’ conditions incredibly easy, and fairly accurate.

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