Manual:$wgProfiling

Profiling: $wgProfiling
Enable for more detailed by-function times in debug log
Introduced in version:pre 1.1.0
Removed in version:1.18.0
Allowed values:(boolean)
Default value:false

DetailsEdit

Enable for more detailed by-function times in debug log.

This setting was mostly deprecated in 1.8.0. It was removed entirely in 1.18.0. To enable profiling you now need to edit StartProfiler.php.