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diff --git a/build/docs/pgo.rst b/build/docs/pgo.rst new file mode 100644 index 0000000000..722056c727 --- /dev/null +++ b/build/docs/pgo.rst @@ -0,0 +1,28 @@ +.. _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 |