.NET Framework February 2020 Preview of Quality Rollup for Windows 10 1909, Windows 10 1903, Windows Server, version 1909 and Windows Server, version 1903

Tara OverfieldFebruary 27, 2020Feb 27, 202002/27/20

Today, we are releasing the February 2020 Preview of Quality Rollup for Windows 10 1909, Windows 10 1903, Windows Server, version 1909 and Windows Server, version 1903.
Quality and Reliability
This release contains the following quality and reliability improvements.
CLR1

Addresses an issue with rare crashes or deadlocks that could occur if a GC occurs while another thread is running NGen’ed code which makes the initial call into a static method within the same module where one or more parameter types involve type-forwarded value types.

Provisional Mode

maoniFebruary 27, 2020Feb 27, 202002/27/20

A coworker asked me what this “PMFullGC” trigger reason he’s seeing in GCStats means. I thought it’d be useful to share the info here.
PM stands for Provisional Mode which means after a GC starts, it can change its mind about the kind of GC it’s doing.

.NET Core February 2020 Updates – 2.1.16, 3.0.3, and 3.1.2

Rahul Bhandari (MSFT)February 18, 2020Feb 18, 202002/18/20

Today, we are releasing the .NET Core February 2020 Update. These updates only contain non-security fixes. See the individual release notes for details on updated packages.
NOTE: If you are a Visual Studio user, there are MSBuild version requirements so use only the .NET Core SDK supported for each Visual Studio version.

Garbage Collection at Food Courts

maoniFebruary 8, 2020Feb 8, 202002/8/20

When I first started working on the GC, my predecessor was explaining the GC tuning to me. I told him that I thought it sounded like how I saw janitors work at food courts (I frequented food courts at the time 😀).

.NET Interactive is here! | .NET Notebooks Preview 2

Maria NaggagaFebruary 6, 2020Feb 6, 202002/6/20

In November 2019, we announced .NET support for Jupyter notebooks with both C# and F# support. Today we are excited to announce Preview 2 of the .NET Notebook experience. Preview 2 includes C#, F#, and PowerShell support.

GC Handles

maoniFebruary 6, 2020Feb 6, 202002/6/20

A customer asked me about analyzing perf related to GC handles. I feel like aside from pinned handles in general handles are not talked about much so this topic warrants some explanation, especially since this is a user facing feature.
For some background info,