andyayers's comments

On: The Performance Impact of C++'s `final` Keyword

[andyayers]

Something closer to a "pure codegen/runtime" example perhaps: I have data showing Roslyn (the C# compiler, itself written in C#) speeds up between ~2x and ~3x running on .NET 8 vs .NET 4.7.1. Roslyn is built so that it can run either against full framework or core, so it's largely the same application IL.

On: .NET 7 is Available Today

[andyayers]

Feel free to open an issue for this over at github.com/dotnet/runtime, if you have code you can share.

On: Compiler Explorer

[andyayers]

IIRC with .NET 7 we will be able to improve this as we can now dump the jit-generated assembly from official builds.

.NET 7 will be officially released in a month or so.

Currently C#/F#/VB support in Compiler Explorer relies on prejitting which has various issues.

On: Performance Improvements in .NET 6

[andyayers]

Please let us know how well (or poorly) it works for you.

[ripley12 → andyayers]

I will, thanks!

Am I correct in thinking that PGO documentation will be coming later as part of the official release? Searching for DOTNET_TieredPGO (mentioned in Stephen's post) doesn't turn up much.

Might give it a spin on Preview 7 this week regardless, Stephen's post has more than enough to get started :)

[andyayers → ripley12]

Yes, we need to provide more guidance.

For now, you might find more info by searching for COMPlus_TieredPGO. The DOTNET_ prefix is a recent addition.

On: Graalphp: An Efficient PHP Implementation Built on...

[andyayers]

FWIW [peachpie](https://www.peachpie.io/2020/09/peachpie-1-0-preview1.html) is a fairly complete PHP stack running on top of .NET core, leveraging the .NET runtime and jit. It can do things like host WordPress.

It fares pretty well in [techempower](https://www.peachpie.io/2018/06/performance-progress-report....).

On: Parallel GCC: a research project aiming to paralle...

[andyayers]

FWIW, MSVC has had this ability for a few years now. It helps with both normal compilation unit compiles and with link-time code generation. See for instance Bruce Dawson's notes: https://randomascii.wordpress.com/2014/03/22/make-vc-compile... .