- Artykuły z tagiem dotnet

I often work on applications whose sole task is to execute a script at certain time or day. You may approach it in several ways, eg.: Task Scheduler (Windows), SQL Job (if it is a SQL task) or CRON in Linux. You may also write application, which would run in background and execute a script at certain time. The only question is – do you really want do it? In this post, I would like to introduce other solution to tasks like this. ...

Scheduled jobs made easy - Topshelf and Quartz.NET |

How often in your code do you see ifs checking whether the object is not null? Often? Very often? What would happen if you didn’t have to check it out? Surely code would be easier to maintain – no ifs = no test cases. This can all be achieved using Null Object pattern.

Null Object pattern - how and when to use it |

Sztuka programowania 11 dni, 6 godzin, 22 minuty temu Mateusz Pustelak 231 rozwiń

Reading time ~5 minutes In my ongoing series on calculating similarities one angle always seemed worth trying, and was pointed out many times on Reddit - use C++ and matrix manipulations. Similarity calculation fits very nicely into matrix representation, and there are algorithms targeting sparse matrix manipulation. So why did I delay it for so long? Because I had other angles I wanted to try and, from the looks of it required significant changes in the existing code base. But since last op...

Understanding OutOfMemoryException – IndexOutOfRange

Sztuka programowania 12 dni, 6 godzin, 14 minut temu maklipsa 137 rozwiń

Reading time ~4 minutes This post is an analysis of a very interesting optimization proposed by Nicholas Frechette in the comments under the previous post. He proposed to use one of the oldest tricks in performance cookbook - divide and conquer. Well, it did not turn out as I expected.Saga Before I go further here are some link to the previous posts on the problem of calculating similarities and then optimizing. This thread grew to a few post. Here are all of them:How I calculate similariti...

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Dividing a bit in two for performance – IndexOutOfRange

Sztuka programowania 15 dni, 6 godzin, 23 minuty temu maklipsa 76 rozwiń

Reading time ~2 minutes This post was inspired by a discussion on Reddit that followed my previous post In this post, I will cover a suggestion by BelowAverageITGuy that cut down the total execution time by almost one hour. Saga Before I go further here are some link to the previous posts on the problem of calculating similarities and then optimizing it grew to few post. Here are all of them:How I calculate similarities in cookit?How to calculate 17 billion similaritiesIndependent code in ...

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Making bits faster – IndexOutOfRange

Sztuka programowania 26 dni, 14 godzin, 39 minut temu maklipsa 94 rozwiń

Reading time ~1 minute This will be a fast errata to the previous one. This time I will expand the oldest performance mantra: The fastest code is the one that doesn’t execute. Second to that is the one that executes once Last time I’ve forgot to mention one very important optimization. It was one of two steps that allowed me to go from 1530 to 484 seconds in the sample run.Saga Before I go further here are some link to the previous posts on the problem of calculating similarities and then...

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Independent code in performance optimizations – IndexOutOfRange

Programowanie rozproszone 39 dni, 16 godzin, 8 minut temu maklipsa 46 rozwiń

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 36 dni, 15 godzin, 48 minut temu maklipsa 53 rozwiń

Reading time ~5 minutes The previous post described the methodology I’ve used to calculate similarities between recipes in cookit. If You haven’t read it I’ll give it 4 minutes because it will make understanding this post easier. Go one, I’ll wait. It ended on a happy note and everything seemed to be downhill from there on. It was until I tried to run it. It took long. Very long. How long? I don’t know because I’ve canceled it after about one hour. Going with a famous quote (probably from E...

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[EN]How to calculate 17 billion similarities – IndexOutOfRange

Sztuka programowania 42 dni, 15 godzin, 43 minuty temu maklipsa 140 rozwiń

Reading time ~5 minutes Warning this post contains some math. Even more, it shows how to use it for solving real life problems. This post describes how I calculate similarity between recipes in my pet project For those of you that don’t know, cookit is a search engine for recipes. It crawls websites extracting recipe texts, then it parses it and tries to create a precise ingredient list with amounts and units. 182 184 recipes2936 ingredients This scale may not seem huge, but tr...

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How I calculate similarities in cookit? – IndexOutOfRange

Sztuka programowania 50 dni, 14 godzin, 35 minut temu maklipsa 56 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 52 dni, 12 godzin, 42 minuty temu maklipsa 108 rozwiń

Nowa seria: Tajemnice CLR. Dziś na tapetę biorę to jak działa metoda GetType() czyli skąd obiekt wie jakiego jest typu.

Tagi: CLR, coreclr, dotnet
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Blog Kokosa | Tajemnice CLR - jak działa GetType()

Inne 75 dni, 10 godzin, 27 minut temu KonradKokosa 228 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 105 dni, 7 godzin, 4 minuty temu maklipsa 80 rozwiń

Reading time ~6 minutes This is a sixth part of a series:part 1 - Why schedule and procrastinate jobs?part 2 - Overview of Hangfiepart 3 - Scheduling and Queuing jobs in Hangfirepart 4 - Dashboard, retries and job cancellationpart 5 - Job continuation with ContinueWithpart 6 - Recurring jobs and cron expressions Parts 3, 4, and 5 covered the BackgroundJob class responsible for enqueuing single jobs (fire and forget). This post will cover RecurringJob class exposing API for recurring jobs (as the name ...

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[EN] Don't do it now! Part 6. Hangfire details - recurring jobs and cron expressions – IndexOutOfRange

Architektura 115 dni, 9 godzin, 41 minut temu maklipsa 36 rozwiń

Reading time ~3 minutes This is a fifth part of a series:part 1 - Why schedule and procrastinate jobs?part 2 - Overview of Hangfiepart 3 - Scheduling and Queuing jobs in Hangfirepart 4 - Dashboard, retries and job cancellationpart 5 - Job continuation with ContinueWithpart 6 - Recurring jobs and cron expressions Part 3 covered almost all functions in BackgroundJob class except for ContinueWith functions family. So here we go :) The fact that it has the same name as a System.Threading.Tasks.Task funct...

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[EN]Don't do it now! Part 5. Hangfire details - job continuation with ContinueWith – IndexOutOfRange

Architektura 122 dni, 12 godzin, 54 minuty temu maklipsa 65 rozwiń

Reading time ~3 minutes This is the fourth part of a series discussing job scheduling and Hangfire details:part 1 - Why schedule and procrastinate jobs?part 2 - Overview of Hangfiepart 3 - Scheduling and Queuing jobs in Hangfirepart 4 - Dashboard, retries and job cancellation This part will cover few small topics:dashboardretriesmore technical part of the Hangfire.BackgroundJob class APIjob cancellationDashboard Let’s start with the administrative dashboard because it gives a good background for the ...

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[EN] Don't do it now! Part 4. Hangfire details - dashboard, retries and job cancellation – IndexOutOfRange

Architektura 129 dni, 18 godzin, 7 minut temu maklipsa 39 rozwiń

Reading time ~2 minutes In the previous post I’ve wrote about why I think the ability to schedule tasks for later execution is a fundamental technical feature, but also a must have from a business point of view. We are passed the whys, so lets get to the hows. The answer is simple - Hangfire. I’ve wrote about it here, here and here, so yeah, I like it. Hangfire is an amazing library. It has proved itself in my pet project ( and in a huge ERP system that we are building at work, where we repla...

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Don't do it now! Part 2. Background tasks, job queuing and scheduling with Hangfire – IndexOutOfRange

Architektura 158 dni, 16 godzin, 23 minuty temu maklipsa 137 rozwiń

.NET Core 1.0 is here and it’s a great, great opportunity to start playing with it not only on Windows platform but also on Linux. Today I will show you not only how to run .NET Core but how to setup whole developer environment for developing .NET. Since one of Microsoft main goals was multiplatform support, let’s take a quick look on how-to setup .NET Core on Ubuntu. Why Ubuntu? Well.. it’s popular and easy....

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Setup .NET Core on Ubuntu 14.04 LTS

Narzędzia 197 dni, 14 godzin, 40 minut temu Michał Wilczyński 138 rozwiń

Big updates related to the Warden project are coming this and the upcoming week. The first release (1.0.0) has just been published to the NuGet and additionally the Web Panel is almost completed. Not only the web interface will be available as a part of the repository, but also, it will be running in the Azure cloud in case you’d like to play with it or store your monitoring data without a need to provide own, hosting environment. And there is one more good news – Warden is getting a brand new logo.

[EN] Warden goes Azure and gets a logo | Piotr Gankiewicz

Daj się poznać 261 dni, 9 godzin, 58 minut temu spetz 25 rozwiń

Packing and publishing nuget from standard .NET project is very simple. Create or generate nuspec file and runnuget pack The appearance of the Core framework and project.json file caused the a little change. Due to historical reason, in .NET Core we have two command line interfaces with utilities for packages.DNU – DNX utility, used in project

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[EN] Publishing .NET Core project to nuget - Lukasz Pyrzyk

Daj się poznać 301 dni, 15 godzin, 50 minut temu kapral18 47 rozwiń

In today’s post, I’ll describe what kind of interfaces have been defined in the Sentry project, and how you can take advantage of this knowledge, e.g. in order to create the custom metrics. I’ve tried to keep these interfaces as simple as possible, yet some of them require an explanation, mostly due to the fact, that even though the library itself is rather simple to use (I want to believe that it’s also what you think), it does not mean that the main methods when being executed, will return for example,...

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[EN] Sentry – how to make use of the interfaces | Piotr Gankiewicz

Daj się poznać 314 dni, 14 godzin, 59 minut temu spetz 81 rozwiń

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