Juan Antonio Farré Basurte wrote: > I want to use profile-guided optimization in my current development project. I have a doubt for which I can't find an answer > anywhere. > > The basic idea of PGO is: > 1. Build instrumented code > 2. Run real-world representative tests to generate profile > info. > 3. Build code using profile info for optimizations. > > My doubt is whether I should build instrumented code (step 1) already > with the same optimization options I want to finally use in step 3, or I'd get more realistical profile info if I compile step 1 without any > optimization (or may be some intermediate option). > > Does anybody have any hints about this question? It's an interative process. You start with compiling your code with a best guess set of optimization options and then rebuild with PGO, and then profile again. Measure every time, make sure you're getting an improvement. Andrew.
