- Artykuły z tagiem performance

Reading time ~6 minutes Last time I’ve shown how I’ve gone from 34 hours to 11. This time we go faster. To go faster I have to do less. The current implementation of Similarity iterates over one vector and checks if that ingredient exists in the second one. Since those vectors are sparse the chance of a miss is big. This means that I am losing computational power on iterating and calling TryGetValue. How to iterate only over the mutually owned ones and do it fast? Saga Before I go furth...

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Using bit masks for high-performance calculations – IndexOutOfRange

Sztuka programowania 698 dni, 3 godziny, 43 minuty temu maklipsa 56 rozwiń

I'm a huge fan of entity based and result set based relational mapping (classic ORMs). I'm also huge fan of DML based relational mapping (micro ORMs). In general I'm a huge fan of every technology that allows me to get the job done in the best possible way. I believe that one should never limit himself to single approach within a project - it should always be about choosing the best tool for the job. But sometimes there are real life constraints (licensing, business, politics etc.) which are limiting the...

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[EN] Entity Framework 6 - Dynamically creating temporary tables from IQueryable (Part 1 of 2)

Inne 704 dni, 3 godziny, 38 minut temu tpeczek 190 rozwiń

Attribute routing (RouteAttribute) is a quite handy feature of ASP.NET MVC. It allows you to have nice looking URLs that everybody has already accustomed to and your client surely loves it. Plus it hides your true controller/action structure which sometimes might be desirable. But there's one catch. As your web app gets bigger and bigger, attribute routing might have a negative performance impact on your WHOLE website.

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[EN] The ugly truth behind pretty URLs

Web 704 dni, 3 godziny, 38 minut temu Krzysztof Zmorzyński 148 rozwiń

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...

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[EN] Problems with AsParallel – IndexOutOfRange

Architektura 714 dni, 37 minut temu maklipsa 109 rozwiń

Kontynuując wątek LINQ, który podjąłem jakiś czas temu, poruszę dziś temat optymalizacji operacji jakie wykonujemy na kolekcjach. Na starcie muszę się przyznać, że tytuł nie jest do końca zgodny z prawdą, bo trzy słowa to o wiele za mało, by wejść w głębiej w temat optymalizacji zapytań. Są jednak 3 metody, które można wykorzystać do znacznego przyspieszenia wykonywania operacji w bardziej rozbudowanych łańcuchach przy minimalnym nakładzie pracy.

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Hryniewski.NET | Trzy słowa o optymalizacji LINQ

Narzędzia 754 dni, 18 godzin, 1 minutę temu Rafał Hryniewski 369 rozwiń

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...

[EN]Debugging high memory usage. Part 2 - .NET Memory Profiler – IndexOutOfRange

Narzędzia 766 dni, 18 godzin, 59 minut temu maklipsa 89 rozwiń

Reading time ~2 minutes I’m taking a short break from Hangfire series, but I will get back to it. This time - Where did my memory go ? Or to be more exact: Why is this using so much memory? The story starts with one IIS application pool using around 6 Gigabytes of memory on one of our test environments. It was several times above the values that we expected it to use, so we decided to investigate. Without much thinking we fired up Visual Studio installed on the test server, and attached to the proce...

[EN] Debugging high memory usage. Part 1 - ProcDump – IndexOutOfRange

Architektura 773 dni, 4 godziny, 15 minut temu maklipsa 64 rozwiń

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

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[EN] The cost of garbage collection – IndexOutOfRange

Sztuka programowania 831 dni, 23 godziny, 58 minut temu maklipsa 123 rozwiń

Imagine that you have a service, which receives requests to execute specific methods, possibly from a number of different underlying libraries that you don’t want to expose directly. Possible examples are web services. The request comes in as a number of string values (method name, parameters etc.) and you need to respond with results. So you have inherited a project with API that starts with a method: object Invoke(string methodName, object[] parameters); You now have to call variety o...

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Invoking methods dynamically in C#: Examples and benchmarks – Kuba on .NET

Inne 855 dni, 3 godziny, 37 minut temu Jakub Szumiato 162 rozwiń

Over the last year on my spare time, I’ve been working on profiler for ASP.NET apps - 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): ...

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Web 866 dni, 4 godziny, 40 minut temu maciekl 99 rozwiń

One of the steps in cookit is calculating similar recipes. This is what you can see on the left on the recipe page like this For the sake of clarity and manageability it’s scheduled as separate Hangfire jobs. Because cookit is running 5 workers, so similarities are calculated for 5 websites concurrently. The process uses cosine similarity, so it allocates a huge list at start and calculates similarities. A very CPU heavy operation. So some time after triggering all recipes recalculation I saw this in...

GC can kill You. Practical GC performance counters in .NET – IndexOutOfRange

Inne 891 dni, 22 godziny, 39 minut temu maklipsa 99 rozwiń

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...

Tagi: net, performance
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System.Console is slow – IndexOutOfRange

Inne 900 dni, 22 godziny, 41 minut temu maklipsa 153 rozwiń

The latest, 6th watcher, has been recently added to the Warden library. It’s probably the simplest one, but it doesn’t mean it’s barely useful. The performance watcher has been created in order to measure the CPU & RAM usage, simple as that. Sounds interesting? If that’s the case, you might find the whole note useful then.

[EN] Measure your CPU & RAM usage with performance watcher | Piotr Gankiewicz

Daj się poznać 2016 926 dni, 1 godzinę, 58 minut temu spetz 36 rozwiń

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...

Tagi: performance, SQL
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[EN] MS Research - High-Performance Incremental Processing of Complex Analytical Queries

Sztuka programowania 968 dni, 15 godzin, 5 minut temu kapral18 25 rozwiń

The ETag or Entity Tag is a part of HTTP protocol used for caching purposes. In the simplest way ETags are strings that help browser to identify and validate cache. Like almost everything the ETags can be inefficient while configured incorrectly. So let's have a closer look at them..

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[EN] Tweak your application with ETags |

Web 1293 dni, 18 godzin, 43 minuty temu blog-kateo-pl 116 rozwiń

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!

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[EN] Speed up you ASP.NET MVC application by removing unused view engines |

Web 1387 dni, 19 godzin, 51 minut temu blog-kateo-pl 185 rozwiń

O korzyściach z modyfikatora sealed, od strony projektowej pisałem już tutaj.  Dzisiaj postanowiłem jednak napisać prosty program, który pokaże nam czy faktycznie są jakieś różnice wydajnościowe. Oczywiście jest to raczej ciekawostka dla ludzi zajmujących się c# internals. Jeśli zależy nam na optymalizacji, zawsze zaczynajmy od ulepszenia samego algorytmu (zmniejszenia jego złożoności), a w ostateczności sięgajmy po mikro-optymalizacje. Warto stosować wspominane wskazówki, ale ze względu na dobre praktyk...

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Piotr Zieliński  » Modyfikator sealed dla klas–wydajność

Sztuka programowania 1406 dni, 19 godzin, 9 minut temu Paweł Łukasik 242 rozwiń

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...

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[EN] JavaScript is slow | Future Processing

Web 1449 dni, 17 godzin, 26 minut temu FutureProcessing 245 rozwiń

AngularJS is a great tool and really helps to write maintainable  and testable code pretty FAST. But I think everyone who uses AngularJS encountered performance issues with this framework. I made some tests on Internet Explorer, where ngRepeat directive can be really slow while rendering. In this post you can see how to use ReactJS or Mithril to improve performance of AngularJS rendering

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[EN] IE rendering with AngularJS + ReactJS + Mithril  | bigguns

Web 1466 dni, 3 godziny, 41 minut temu http://chrisseroka.wordpres... 108 rozwiń

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...

[EN] Modelling load distribution | Technical blog

Inne 1576 dni, 20 godzin, 34 minuty temu FutureProcessing 104 rozwiń

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