.. _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