News Announcing .NET 6 Preview 3

FireWind

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Announcing .NET 6 Preview 3
April 8th, 2021

Today, we are delighted to release .NET 6 Preview 3. This release is dedicated almost entirely to low-level performance features. These are the types of improvements that many folks don’t necessarily always fully appreciate, but they help a lot for many apps. Most of these improvements apply to the CLR type system directly, either making it function faster or better interplay with modern CPUs (think “hardware accelerate the type system”). In the last few years, there have been a few key performance trends with .NET, including: using structs more liberally in libraries, and moving runtime code to C#. Both of trends are visible (directly or indirectly) in these changes. It also demonstrates continued efforts on a focused set of performance strategies.

You will notice that two of these performance changes came Как увидеть ссылки? | How to see hidden links?. He’s well known for word play on his Как увидеть ссылки? | How to see hidden links?. In the spirit of April 1st (recently past), perhaps we can virtually rename this release to .NET 6 Preview B3n. Thanks B3n!

You’ll also see performance contributions from Как увидеть ссылки? | How to see hidden links? and Как увидеть ссылки? | How to see hidden links?. Thanks!

You can Как увидеть ссылки? | How to see hidden links?, for Windows, macOS, and Linux.
See the Как увидеть ссылки? | How to see hidden links? for more detail on what’s new for web technology. For EF Core, Как увидеть ссылки? | How to see hidden links? includes several bug fixes and ongoing improvements to infrastructure to support upcoming features including compiled models and temporal tables

.NET 6 has been tested with Visual Studio 16.10 Preview 1 and Visual Studio for Mac 8.9. We recommend you use those builds if you want to try .NET 6.

For Linux users: .NET SDK 6 Preview 3 resolves an issue where Как увидеть ссылки? | How to see hidden links? due to expired NuGet certificates and unfortunate interactions with changes made to root certificates stores on Linux, carried by ca-certificates and nss packages. Please update your Как увидеть ссылки? | How to see hidden links? and .NET 6 SDK deployments on Linux, ASAP.

Support​

.NET 6 will be will be released in November 2021, and will be supported for three years, as a Как увидеть ссылки? | How to see hidden links?. The Как увидеть ссылки? | How to see hidden links? has been significantly expanded.

The additions are:
  • Android.
  • iOS.
  • Mac and Mac Catalyst, for x64 and Apple Silicon (AKA “M1”).
  • Windows Arm64 (specifically Windows Desktop).
.NET 6 Debian container images are based on Debian 11 (“bullseye”), which is Как увидеть ссылки? | How to see hidden links?.

Libraries​

The following APIs and improvements have been added to the .NET libraries.

Faster handling of structs as Dictionary values​

A new unsafe api — Как увидеть ссылки? | How to see hidden links? — has been added that makes updating struct values in Dictionaries faster. The new API is intended for high performance scenarios, not for general purpose use. It returns a ref to the struct value which can then be updated in place with typical techniques.

Prior to this change, updating struct dictionary values can be expensive for high-performance scenarios, requiring a dictionary lookup and a copy to stack of the struct; then after changing the struct, it needs to be assigned to the dictionary key again resulting in another look up and copy operation. This improvement reduces the key hashing to 1 (from 2) and removes all the struct copy operations.

Example:
C#:
ref MyStruct value = CollectionsMarshal.GetValueRef(dictionary, key);
// Returns Unsafe.NullRef<TValue>() if it doesn't exist; check using Unsafe.IsNullRef(ref value)
if (!Unsafe.IsNullRef(ref value))
{
    // Mutate in-place
    value.MyInt++;
}
Credit to Как увидеть ссылки? | How to see hidden links?.

Faster interface checking and casting​

Как увидеть ссылки? | How to see hidden links? by 16% – 38%. This improvement is particularly useful for C#’s pattern matching to and between interfaces.
Как увидеть ссылки? | How to see hidden links?
MethodImplementation
Mean​
Version
Ratio​
Improvement​
IsInterface1Interfaces1
2.166 ns​
.NET 6 Preview 2
1.000​
IsInterface1Interfaces1
1.629 ns​
.NET 6 Preview 3
0.752
x1.3​
IsNotImplementedInterfaces1
2.166 ns​
.NET 6 Preview 2
1.000​
IsNotImplementedInterfaces1
1.950 ns​
.NET 6 Preview 3
0.900
x1.1​
IsInterface1Interfaces6
2.155 ns​
.NET 6 Preview 2
1.000​
IsInterface1Interfaces6
1.936 ns​
.NET 6 Preview 3
0.898
x1.1​
IsInterface2Interfaces6
2.161 ns​
.NET 6 Preview 2
1.000​
IsInterface2Interfaces6
1.908 ns​
.NET 6 Preview 3
0.883
x1.1​
IsInterface3Interfaces6
2.188 ns​
.NET 6 Preview 2
1.000​
IsInterface3Interfaces6
1.672 ns​
.NET 6 Preview 3
0.764
x1.3​
IsInterface4Interfaces6
2.346 ns​
.NET 6 Preview 2
1.000​
IsInterface4Interfaces6
1.965 ns​
.NET 6 Preview 3
0.838
x1.2​
IsInterface5Interfaces6
3.122 ns​
.NET 6 Preview 2
1.000​
IsInterface5Interfaces6
2.173 ns​
.NET 6 Preview 3
0.696
x1.4​
IsInterface6Interfaces6
3.472 ns​
.NET 6 Preview 2
1.000​
IsInterface6Interfaces6
2.687 ns​
.NET 6 Preview 3
0.774
x1.3​
IsNotImplementedInterfaces6
3.644 ns​
.NET 6 Preview 2
1.000​
IsNotImplementedInterfaces6
3.071 ns​
.NET 6 Preview 3
0.843
x1.2​
One of the biggest advantages of moving parts of the .NET runtime from C++ to managed C# is that it Как увидеть ссылки? | How to see hidden links?. This includes interface casting, which was moved to C# as an early .NET 6 change. Many more people in the .NET ecosystem are literate in C# than C++ (and the runtime isn’t even regular C++). Just being able to read some of the code that composes the runtime is a major step to developing confidence in contributing, in its various forms.

Credit to Как увидеть ссылки? | How to see hidden links?.

Runtime: Codegen​

The following changes improve code generation in RyuJIT, either making the process more efficient or the resulting code faster to run. A recent post on Как увидеть ссылки? | How to see hidden links? does a great job of demonstrating the level of consideration and detail that is required for optimal performance.

Optimizations:​

Dynamic PGO​

Keep structs in register​

Completed .NET 6 EH Write Thru​

Как увидеть ссылки? | How to see hidden links?

 

FireWind

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Tools: Initial .NET Hot Reload support now available for web apps​

Early support for .NET Hot Reload is now available for ASP.NET Core & Blazor projects using dotnet watch. .NET Hot Reload applies code changes to your running app without restarting it and without losing any app state. Code changes that cannot be applied to the running app can still be applied by rebuilding and restarting the app.

This is just the first step in our more comprehensive plan to bring this technology to all .NET developers including desktop (WPF, WinUI, WinForms), cross-platform client scenarios in .NET MAUI, and more. .NET Hot Reload will be supported with these additional platforms in future preview releases of .NET 6. In addition, we will also make .NET Hot Reload available as an integrated experience in future Visual Studio releases.

For more details on trying out hot reload with web app projects, see Как увидеть ссылки? | How to see hidden links?

Closing​

We’re now about half way through the .NET 6 release, at least in terms of feature development. You can read about other features that have been added, in the Как увидеть ссылки? | How to see hidden links? and Как увидеть ссылки? | How to see hidden links? releases. We expect some larger features to land in the next few previews before we start into focusing on quality in the release candidate builds.

I started the post raising visibility on some great community contributions. Some community folks are using the Как увидеть ссылки? | How to see hidden links? program to support spending more of their time on contributing to .NET. That’s great. Как увидеть ссылки? | How to see hidden links?. I encourage you to consider supporting community developers improving .NET, perhaps focused on a part of the product you depend on significantly. Its a good opportunity to invest in your supply chain.