Manual:$wgHipHopCompilerProcs

Maintenance scripts setting: $wgHipHopCompilerProcs
Number of parallel processes to use during HipHop compilation.
Introduced in version:1.18.0 (r88959)
Removed in version:1.22.0 (Gerrit change 62784; git #1fe9340b)
Allowed values:(integer > 0 or 'detect')
Default value:'detect'

Details edit

Number of parallel processes to use during HipHop compilation, or "detect" to guess from system properties.