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maklipsa
maklipsa
1 065,08
7 dni, 12 minut temu
6 maja, 2016
dotnetomaniak.pl

Reading time ~6 minutes Querying hierarchical data is always where the big boys of SQL shined. And I really mean the big boys part since only Oracle, and Microsoft SQL Server have support for CTE (Common Table Expressions) that allow for executing one SQL statement what will fetch a subtree. There are data modeling approaches that allow for doing hierarchical data reads with noSQL databases and databases without support for CTE. The most common and obvious example of hierarchical data is the family tr...

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How to model hierarchical data in noSQL databases – IndexOutOfRange

Architektura 6 dni, 54 minuty temu maklipsa 61 źrodło rozwiń

Reading time ~11 minutes So, Yes. I hit a pause button on writing because many things were happening, and as it turns out, you can only squeeze 24 hours in one day. Who knew? However (hopefully) my blog will come back to life. One of the things that kept me busy during this time was realizing one of my goals: Make a video course for Pluralsight. And I made it: Now that it is done, and I had a few months to reflect, a few lessons for those thinking about doing any video course.Choosing the course ...

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Czego nauczyłem się robiąc kurs dla Pluralsight – IndexOutOfRange

Inne 12 dni, 48 minut temu maklipsa 163 źrodło rozwiń

Reading time ~3 minutes This article is Part 2 in a 2-Part Series. Part 1 - The missing Azure Functions documentationPart 2 - This Article As I wrote in the previous post there are two ways to run precompiled .NET code in Azure Functions - .NET 4.6.x or .NET Core. Why did I decide to go with the old .NET runtime? For the current moment, F# on .NET Core does not support type providers (there is a workaround, but I didn’t want to go with it for the current moment). I went to work thinking that it will...

Troubleshooting compiled Azure Functions in F# – IndexOutOfRange

Cloud 549 dni, 8 minut temu maklipsa 20 źrodło rozwiń

Reading time ~3 minutes This article is Part 1 in a 1-Part Series. Part 1 - This Article Trying to understand how to run code in Azure Functions is not an easy task since this product has evolved on its own and thanks to the rise of .NET Core. This post will give You a history background necessary to understand the documentation and, most of all, all the blog posts talking about Azure Functions.v1.0 - script files The initial way to run code in Azure Function was to write a script file in Azure Fun...

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The missing Azure Functions documentation – IndexOutOfRange

Cloud 562 dni, 23 godziny, 53 minuty temu maklipsa 23 źrodło rozwiń

Reading time ~10 minutes This article is Part 2 in a 2-Part Series. Part 1 - What is the simplest database?Part 2 - This Article The previous post laid out the most minimum requirements for something to be called a database. While they may be too bare bones for many, there are a lot of databases that don’t fulfill even half of them, and this isn’t stopping from using them on a daily basis. The last time I’ve looked at files, this time something a bit more complex - key-value databases. The idea be...

Want unlimited scale and performance? This is where to start – IndexOutOfRange

Architektura 842 dni, 23 minuty temu maklipsa 43 źrodło rozwiń

Reading time ~3 minutes The world of databases is a fascinating topic. It is very diverse. Many of them are extremely complex systems, but there are also very simple ones. There are the general purpose ones, and ones that do only one thing good, but they do it excelent. Despite all of this we tend to pick them just like we order food in a restaurant:I’ll take the same as last time. It wasn’t ideal for what I wanted, but I could pick worse.Hmm… Everyone is taking this one, so I’ll take it also. Well, m...

Tagi: DATABASE, design
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What is the simplest database? – IndexOutOfRange

Architektura 850 dni, 23 godziny, 15 minut temu maklipsa 93 źrodło rozwiń

Reading time ~5 minutes Configuration as code movement isn’t anything new and is here to stay. I haven’t had time to actually do a from zero to the desired state configuration script until a few weeks ago. Below are my thoughts after three weeks with PowerShell Desired State Configuration. What I wanted to do First, let me describe the goal I’ve set before myself. I wanted to write a script that would go from a clean Windows machine to a fully configured TeamCity server with SQL Server storage and t...

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Developers perspective on PowerShell Desired State Configuration – IndexOutOfRange

Narzędzia 864 dni, 23 godziny, 44 minuty temu maklipsa 21 źrodło rozwiń

Reading time ~6 minutes In most cases .NET manages to solve the DLL hell problem pretty well, but sometimes it all falls apart, and when it does in best case scenario we see something like this:Could not load file or assembly 'XXXX, Version=X.Y.Z.W, Culture=neutral, PublicKeyToken=eb42632606e9261f' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) The much worst case is this:The method 'XXXX' was not fou...

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Could not load file or assembly or one of its dependencies. – IndexOutOfRange

Narzędzia 865 dni, 23 godziny, 55 minut temu maklipsa 71 źrodło rozwiń

Reading time ~16 minutes While I’m working on the next angle on how to speed up calculating similarities I started investigating how to get better telemetry from cookit. Getting telemetry is easy - making sense of it is the hard part. This also brought another pain point of current setup - logging and monitoring. Since cookit is my pet, nonprofit project it was time to do something. There is a comparison table at the end, and what I’ve choose.The current state of logging and monitoringRequirementsThe ...

Choosing centralized logging and monitoring system – IndexOutOfRange

Architektura 879 dni, 20 godzin, 51 minut temu maklipsa 212 źrodło 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 921 dni, 14 godzin, 10 minut temu maklipsa 147 źrodło 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 924 dni, 14 godzin, 19 minut temu maklipsa 78 źrodło 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 935 dni, 22 godziny, 35 minut temu maklipsa 94 źrodło 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

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 945 dni, 23 godziny, 44 minuty temu maklipsa 57 źrodło 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 951 dni, 23 godziny, 39 minut temu maklipsa 141 źrodło 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 cookit.pl. 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 959 dni, 22 godziny, 31 minut temu maklipsa 56 źrodło 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 961 dni, 20 godzin, 37 minut temu maklipsa 114 źrodło 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 1014 dni, 14 godzin, 59 minut temu maklipsa 89 źrodło 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 1021 dni, 16 minut temu maklipsa 64 źrodło 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 1024 dni, 17 godzin, 37 minut temu maklipsa 41 źrodło rozwiń

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