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.. _pgo:
===========================
Profile Guided Optimization
===========================
:abbr:`PGO (Profile Guided Optimization)` is the process of adding
probes to a compiled binary, running said binary, then using the
run-time information to *recompile* the binary to (hopefully) make it
faster.
How PGO Builds Work
===================
The supported interface for invoking a PGO build is to add ``MOZ_PGO=1`` to
configure flags and then build. e.g. in your mozconfig::
ac_add_options MOZ_PGO=1
Then::
$ ./mach build
This is roughly equivalent to::
#. Perform a build with *--enable-profile-generate* in $topobjdir/instrumented
#. Perform a run of the instrumented binaries with build/pgo/profileserver.py
#. Perform a build with *--enable-profile-use* in $topobjdir