Tag: General

In this post, we’ll look at writing a simple system for scheduling tasks in ASP.NET Core 2.0. That’s quite a big claim, so I want to add a disclaimer: this system is mainly meant to populate data in our application’s cache in the background, although it can probably be used for other things as well. It builds on the ASP.NET Core 2.0 IHostedService interface. Before we dive in, I want to give some of the background about why I thought of writing this.

A while back, we were performance profiling an application and noticed a big performance bottleneck while mapping objects using AutoMapper. Mapping is of course somewhat expensive, but the numbers we were seeing were way higher than expected: mapping was ridiculously slow! And “just mapping” was not a good explanation for these numbers. Trusting the work of Jimmy and trusting AutoMapper, we expected something else was probably causing this. And it was: a regular expression match was to blame!

A few weeks back, .NET Core 1.1 was released (and a boatload of related tools such as Visual Studio 2017. For .NET Core projects, a big breaking change was introduced: the project format is no longer project.json but good old .csproj. That’s a little bit of a lie: the .csproj is actually an entirely new, simplified format that combines the best of the old .csproj and project.json and works with .NET Standard and .NET Core.

Here’s a story on how I once used dotPeek to provide debugger symbols and (decompiled) source code for a crashed application for which we had nothing but the application assemblies available. Namespaces have been altered to protect the innocent.

Two weeks ago I had a wonderful experience speaking at a small conference in Finland. The talk was titled What is going on - Application diagnostics on Azure (slides) and focused on the importance of semantic logging and how Azure Application Insights (AppInsights) can help make sense of that data and correlate it with other telemetry coming from the application server. What I did not cover in that talk was AppInsights telemetry processors - essentially a pipeline through which your server-side AppInsights data passes before it is sent off to the giant data store that is the AppInsights service.

Since my posts on making code allocate less memory and memory allocation for strings were quite well received, I decided to add another post to the series: Exploring .NET managed heap with ClrMD. In this post, we’ll explore what is inside .NET’s managed heap (you know, the thing where we alocate our objects), how it’s structured and how we can do some cool tricks with it. We’ll even replicate dotMemory’s dominators/path to root feature.

A while back, I wrote about making code allocate less memory (go read it now if you haven’t). In that post, we saw how the Garbage Collector works and how it decides to keep objects around in memory or reclaim them. There’s one specific type we never touched on in that post: strings. Why would we? They look like value types, so they aren’t subject to Garbage Collection, right? Well… Wrong. Strings are objects like any other object and follow the same rules. In this post, we will look at how they behave in terms of memory allocation. Let’s see what that means. In this series:

The .NET Garbage Collector (GC) is quite cool. In combination with the runtime’s virtual memory, it helps providing our applications with virtually unlimited memory, by reclaiming memory that is no longer in use and making it available to our code again. By doing so, it also takes away the burden of having to allocate and free memory explicitly. But sometimes, it still matters to understand when and where memory is allocated. The reason for that is simple: if we can use efficient coding to help our GC spend less CPU time allocating and freeing memory we can make our applications faster and less “allocatey”.

At the start of 2015, I checked out from JetBrains to join Microsoft. Today, after almost two years in the NuGet team, it’s time for change. Microsoft and NuGet have been a fun ride, and I got to complete my personal mission… I remember Paul Stack trolling me (“Hey Maarten, is NuGet down?”) on more than one occasion, and am really happy that I got the freedom and support for changing that. The quest towards server stability even got me a well-received conference talk, “Sherlock Homepage”. Thanks Jeff (x2), Yishai, Hari, Jun and team! Mission accomplished! And thanks for the great walks in wonderful Washington state when I was over there, I’ll sure miss stopping by that region every once in a while.

You may know (or not, shame on you!) Xavier Decoster and myself are operating MyGet, a hosted service providing teams with hosting and management of NuGet, npm, Bower, VSIX and debugger symbols. Recently, we started looking into how we could do better on the content marketing front, an important piece of getting people to visit and hopefully sign up to our service. We decided on starting a series on the MyGet blog, named “NuGet and NPM news from the community”.