Reading time ~6 minutes This post is covering a subset of what I am talking in my talk How I stopped worrying and learned to love parallel processing (currently only in polish). This will cover on how, in terms of performance, AsParallel can kick you in a place where it hurts a lot, simultaneously being a blessing in terms of… performance. How is that? Let’s look at someHistory AsParallel was introduced as an extension to LINQ with TPL in .NET 4.0. In theory, it’s God’s sent. The promise w...

Reading time ~4 minutes Diagnosing high memory usage can be tricky, here is the second part of how I found what was hogging to much memory in our system. In the previous post I’ve wrote how to create a memory dump and how many possibilities of catching just the right moment for it ProcDump has. When trying to analyze memory leaks, or high memory usage (not necessary meaning a leak) we have a few ways to approach it: Attach a debugger There are many problems with this approach, to name a fe...

Just how long does garbage collection take in .NET? Which generation takes longer?

Over the last year on my spare time, I’ve been working on profiler for ASP.NET apps - netric.io. This small tool instruments methods from chosen assemblies and visualizes statistics of their execution times. It has got lower priority for me for a long time because of “Daj Się poznać” and other things but I think this project is worth to finally shed some light on it. Right now, the tool does just one thing: for every HTTP request, it generates methods time visualization like this (click to enlarge): ...

Anyone who made any HackerRank problems considering performance has seen this phrase in the assignment: “watch out for slow IO”. We are used to thing about files, databases and such as potentially slow IO, but the Console? Yes, and you will be amazed how much. Couple words about the setup. I am using NLog with file target (for normal logging) and mail target (for total failure, and aggregated reports). When debugging or profiling I run the process as a con...

In this talk, I will present techniques for efficient incremental processing of complex analytical queries, ranging from classical SQL queries to linear algebra programs. Our system, called DBToaster, compiles declarative database queries into high-performance stream processing engines that keep query results (views) fresh at very high update rates. DBToaster uses a recursive query compilation algorithm that materializes a supporting set of higher-order delta views to achieve a substantially lower view m...

ASP.NET MVC by default ships with two view engines: Web Forms and Razor. When we are creating a new ASP.NET MVC application both are being included in the application startup. Even when you are working with Razor only ASP.NET MVC resolves named views by searching for files that match the Web Forms view engine's naming convention at first. What can we do to change that and reduce the time needed to return a view to the end user? Let's have a look!

There is a belief among many developers that JavaScript is very slow, and writing more code in it than it’s necessary may adversely affect the performance. I guess it’s partially true. Incompetent use of this language can indeed decrease the quality of the project and the performance itself. However, JavaScript is one of the most developing languages.I’ll show you a few examples that will prove that JavaScript engines do what they can to speed up your code. In my work I focus on Google’s open source Java...

Modelling load distribution One of the challenges we face during the performance test design is determining the load we should use. By the load here, I mean a number of concurrent users performing certain actions in System Under Test (SUT). Obviously, depending on the type of performance test applied, the load will alter, as we are testing system in search of different class of problems. This article attempts to describe the case in which we will try to simulate the anticipated high traffic in t...

Each SharePoint software engineer should know how to avoid query throttling by writing efficient queries, and designing appropriate list’s structure. The sections below provide practices and tips ensuring your ability to access many items. Additionally, they help to keep site operating smoothly. All information in this article applies to SharePoint Server 2010. SharePoint 2010 has introduced many new features. One of them is Resource Throttling - designed to avoid performance degradation that can occur w...