PGO not only for own code but for D runtime & Phobos too?

Jon Degenhardt jond at
Thu Oct 3 16:01:19 UTC 2019

On Thursday, 3 October 2019 at 15:15:44 UTC, Robert M. Münch 
> Did anyone already try to use PGO with his own code and for the 
> D runtime and phobos?
> Any indication how big the performance difference is when the D 
> runtime and Phobos is compiled using PGO?

I did a study of LTO and PGO on the combined application and 
libraries (druntime & phobos). It's available here:

For the apps tested it's a big win to include druntime and phobos 
in the LTO/PGO target. PGO makes a difference standalone, though 
I didn't try to separate the app code from the druntime/phobos 


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