[wp-trac] [WordPress Trac] #45804: Make WP_Hook gather callback performance information

[WordPress Trac]

#45804: Make WP_Hook gather callback performance information
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 Reporter:  Rarst        |       Owner:  (none)
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  Plugins      |     Version:
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:  performance
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Comment (by Rarst):

 I've run a rough benchmark with 1 hook x 5 lightweight callbacks x 10,000
 executions = 50,000 callback runs.

 On my machine this goes from 19ms to 2.8s (memory goes up by several
 megabytes, but fluctuates a lot).

 While if you are firing 50K real–world callbacks — you probably have
 bigger problems, nevertheless this is probably too heavy to just enable.
 Constant opt–in then.

 Also while playing with this I realized that my initial suggestion is a
 little too granular. It works well if I ''already know the hook'' I am
 interested in. But it doesn't work well for easily answering questions
 like "''which'' hooks were slower than N ms".

 I think collection should also capture same metrics (start time and
 duration) for overall hook execution. This will give two levels of
 granularity to easily detect both hooks and callbacks worth attention.

 Will start on a patch and see if anything else comes up.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45804#comment:3>
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