[wpmu-trac] [WordPress MU Trac] #1053: WPMU Dashboard high memory usage

[WordPress MU Trac]

#1053: WPMU Dashboard high memory usage
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 Reporter:  jasonbenesch  |        Owner:  somebody
     Type:  enhancement   |       Status:  reopened
 Priority:  normal        |    Milestone:  2.8.1a  
Component:  Optimisation  |      Version:  2.8.1   
 Severity:  normal        |   Resolution:          
 Keywords:  dev-feedback  |  
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Changes (by jamescollins):

  * keywords:  => dev-feedback
  * summary:  Memory Hog => WPMU Dashboard high memory usage
  * component:  Administration => Optimisation
  * milestone:  => 2.8.1a

Comment:

 In [1887] donncha changed the default memory limit to 64MB.

 You are right though, when loading the my blogs page, get_blogs_of_user()
 is called 3 times.

 On every other dashboard page load, get_blogs_of_user() is called only
 once.

 Out of interest, how many blogs / users do you have on your system?

 The get_blogs_of_user() will call get_blog_details() for each of the blogs
 that the user is a "member" of as well.

 Ideally if we only had to call get_blogs_of_user() once on every dashboard
 page load (including when visiting the my blogs page), then that would
 probably help with performance.

 Donncha, any suggestions on the best way to do this?

 I have just profiled the loading of the main dashboard page, and in the
 wp-admin/includes/mu.php file, the mu_media_buttons() function seems to
 take the longest out of all the functions in the file (0.000140sec).

 In wp-includes/wpmu-functions.php, the get_dirsize() function takes the
 longest (0.001417sec), and is called 9 times. In my test, this function
 was recursively called which resulted in the following directories having
 their size calculated:

 {{{
 /wp-content/blogs.dir/1/files/
 /wp-content/blogs.dir/1/files/2009
 /wp-content/blogs.dir/1/files/2009/01
 /wp-content/blogs.dir/1/files/2009/02
 /wp-content/blogs.dir/1/files/2009/03
 /wp-content/blogs.dir/1/files/2009/04
 /wp-content/blogs.dir/1/files/2009/05
 /wp-content/blogs.dir/1/files/2009/06
 /wp-content/blogs.dir/1/files/2009/07
 }}}

 Perhaps there is some way that this function can be optimized.

 get_blogs_of_user() is the next slowest function (0.001132sec) but is only
 called once on most dashboard page loads.

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Ticket URL: <http://trac.mu.wordpress.org/ticket/1053#comment:12>
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