Performance Archives

Async ValueTask Pooling in .NET 5

Stephen Toub - MSFTMarch 16, 2020Mar 16, 202003/16/20

The async/await feature in C# has revolutionized how developers targeting .NET write asynchronous code. Sprinkle some async and await around, change some return types to be tasks, and badda bing badda boom, you've got an asynchronous implementation. In theory. In practice, obviously I've exaggerated the ease with which a codebase can be made

ConfigureAwait FAQ

Stephen Toub - MSFTDecember 11, 2019Dec 11, 201912/11/19

.NET added async/await to the languages and libraries over seven years ago. In that time, it's caught on like wildfire, not only across the .NET ecosystem, but also being replicated in a myriad of other languages and frameworks. It's also seen a ton of improvements in .NET, in terms of additional language constructs that utilize asynchrony, AP

An Introduction to System.Threading.Channels

Stephen Toub - MSFTDecember 11, 2019Dec 11, 201912/11/19

"Producer/consumer" problems are everywhere, in all facets of our lives. A line cook at a fast food restaurant, slicing tomatoes that are handed off to another cook to assemble a burger, which is handed off to a register worker to fulfill your order, which you happily gobble down. Postal drivers delivering mail all along their routes, and you

GC Perf Infrastructure – Part 1

maoniDecember 9, 2019Dec 9, 201912/9/19

We open sourced our new GC Perf Infrastructure! It’s now part of the dotnet performance repo. I’ve been meaning to write about it ‘cause some curious minds had been asking when they could use it after I blogged about it last time but didn’t get around to it till now. First of all, let me point out that the target audience of this infr

GC Perf Infrastructure – Part 0

maoniSeptember 9, 2019Sep 9, 201909/9/19

In this blog entry and some future ones I will be showing off functionalities that our new GC perf infrastructure provides. Andy and I have been working on it (he did all the work; I merely played the consultant role). We will be open sourcing it soon and I wanted to give you some examples of using it and you can add these to your repertoire o

Hardware Intrinsics in .NET Core

Tanner Gooding [MSFT]September 3, 2019Sep 3, 201909/3/19

Several years ago, we decided that it was time to support SIMD code in .NET. We introduced the System.Numerics namespace with Vector2, Vector3, Vector4, Vector<T>, and related types. These types expose a general-purpose API for creating, accessing, and operating on them using hardware vector instructions (when available). They also

Performance Improvements in .NET Core 3.0

Stephen Toub - MSFTMay 15, 2019May 15, 201905/15/19

Take a tour through some of the many improvements, big and small, that have gone into the .NET Core 3.0 runtime and core libraries to make apps and services leaner and faster.

Making CPU configuration better for GC on machines with > 64 CPUs

maoniApril 3, 2019Apr 3, 201904/3/19

If you are running Windows on a machine with > 64 CPUs, you’ll need to use this feature called the CPU groups for your process to be able to use more than 64 CPUs. At some point in the far distant past, people thought having more than 64 processors on a machine was inconceivable so they used a 64-bit number for the processor mask. And when 6

You Should Never See This Callstack in Production

maoniOctober 9, 2018Oct 9, 201810/9/18

A customer who just experienced some server outage asked us for help as they thought it was due to some very long GC pauses. I thought this diagnostics exercise might be useful for other folks as well so I am sharing it with you. We had them collect a GCCollectOnly trace which showed there were some very long induced gen2 blocking GCs. And th

Middle Ground between Server and Workstation GC

maoniOctober 2, 2018Oct 2, 201810/2/18

A long time ago I wrote about using Workstation GC on server applications when you have many instances of your server app running on the same machine. By default Server GC will treat the process as owning the machine so it uses all CPUs to do the GC work. More and more folks find themselves in a situation where they might have a few active ins

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