Comments on: TriPUG and MySQL Talk on Memcache and PHP http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/ Fri, 21 Nov 2008 19:05:37 +0000 http://wordpress.org/?v=2.6.1 By: vin http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18235 vin Thu, 10 Jul 2008 05:17:35 +0000 http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18235 ok ive had my nose buried in memcached for the past few days and im starting to get it going.. so far i see how it saves db load by sparing reads, but is writing to the db from memcached data a common practice as well? or is there some more efficient way of handling write-intensive operations? ok ive had my nose buried in memcached for the past few days and im starting to get it going.. so far i see how it saves db load by sparing reads, but is writing to the db from memcached data a common practice as well? or is there some more efficient way of handling write-intensive operations?

]]> By: drasch http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18107 drasch Sat, 05 Jul 2008 18:03:24 +0000 http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18107 Great observation, and you've identified an opportunity for further optimization. However, getting the individual posts is a pretty "cheap" sql operation (since you already have the primary keys), so you'll see most of the performance gain from the data that gets cached to show the most recent post ids. This is obviously a simplistic example to demonstrate good performance, but the point applies across the board. You should actually profile your application and see where the most impact can be made with caching. Three things to look at in your profile data are: what're the operations that take the most time each time they're run, what operations are run the most often, and what operations consumed the most time overall. Each of these may offer up opportunities for optimization. You'll often find some things at the slow end of each of these that can make enormous impact. Great observation, and you’ve identified an opportunity for further optimization. However, getting the individual posts is a pretty “cheap” sql operation (since you already have the primary keys), so you’ll see most of the performance gain from the data that gets cached to show the most recent post ids.

This is obviously a simplistic example to demonstrate good performance, but the point applies across the board. You should actually profile your application and see where the most impact can be made with caching. Three things to look at in your profile data are: what’re the operations that take the most time each time they’re run, what operations are run the most often, and what operations consumed the most time overall. Each of these may offer up opportunities for optimization. You’ll often find some things at the slow end of each of these that can make enormous impact.

]]> By: vin http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18105 vin Sat, 05 Jul 2008 17:54:27 +0000 http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18105 this is great.. pardon my ignorance (not a coder), but a question: in the get_recent_posts() function, would/should an 'else' separate the 'cache miss' conditional from the mysql_query? otherwise wouldnt it always get the db data vs the memcached data? thanks again :) this is great.. pardon my ignorance (not a coder), but a question: in the get_recent_posts() function, would/should an ‘else’ separate the ‘cache miss’ conditional from the mysql_query? otherwise wouldnt it always get the db data vs the memcached data? thanks again :)

]]> By: drasch http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18077 drasch Fri, 04 Jul 2008 14:47:47 +0000 http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18077 yay, found it! the link should be working again. yay, found it! the link should be working again.

]]> By: drasch http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18076 drasch Fri, 04 Jul 2008 14:40:06 +0000 http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18076 This seems to be misplaced in some "upgrade". I'll see if I can locate it and get it back online. Thanks. This seems to be misplaced in some “upgrade”. I’ll see if I can locate it and get it back online. Thanks.

]]> By: vin http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18068 vin Fri, 04 Jul 2008 05:23:22 +0000 http://www.davidrasch.com/2007/05/03/tripug-and-mysql-post-on-memcache-and-php/#comment-18068 hi, are the files/talk still available? links arent working.. thanks :) hi, are the files/talk still available? links arent working.. thanks :)

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