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install: minor tweaks to PGO instructions

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Daniel Eklöf 2020-11-22 19:07:50 +01:00
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INSTALL.md
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@ -134,10 +134,10 @@ mkdir -p bld/release && cd bld/release
Below are instructions for building foot either [size Below are instructions for building foot either [size
optimized](#size-optimized), [performance optimized](#size-optimized), [performance
optimized](performance-optimized-non-pgo), or [performance optimized](performance-optimized-non-pgo), or performance
optimized](#performance-optimized-pgo) using PGO. optimized using [PGO](#performance-optimized-pgo).
PGO - Profile Guided Optimization - is a way to optimize a program PGO - _Profile Guided Optimization_ - is a way to optimize a program
better than `-O3` can, and is done by compiling foot twice: first to better than `-O3` can, and is done by compiling foot twice: first to
generate an instrumented version which is used to run a payload that generate an instrumented version which is used to run a payload that
exercises the performance critical parts of foot, and then a second exercises the performance critical parts of foot, and then a second
@ -209,6 +209,8 @@ running the real foot binary. The latter has slightly better results
(i.e. results in a faster binary), but must be run in a Wayland (i.e. results in a faster binary), but must be run in a Wayland
session. session.
A full PGO build also tends to be smaller than a partial build.
##### Partial PGO ##### Partial PGO