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GC Perf Infrastructure – Part 0

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 ...

Hardware Intrinsics in .NET Core

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 ...

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

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 ...

You Should Never See This Callstack in Production

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 ...

Middle Ground between Server and Workstation GC

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 ...

GLAD is available

GC ETW series - GC ETW Events - Part 1 GC ETW Events - Part 2 GC ETW Events - Part 3 GC ETW Events - Part 4 Processing GC ETW Events Programmatically with the GLAD Library (this post) End of last year I mentioned we wanted to provide an API for you to really investigate GC/managed memory related performance called GLAD. ...

Large Object Heap Uncovered (an old MSDN article)

I wrote this article in 2008 and the MSDN website no longer has it so I am making it available here. Please note that it has been quite a while and some things related to LOH have changed quite a bit. See the GC ETW blog entries I wrote for the current tooling options. Also note that obviously some of the links mentioned in this article may ...