So…after quite a serious thing which was writing Pro .NET Memory Management book, I’ve decided to experiment with a little pet project for having some more fun. I have quite a few very interesting ideas going on in my head. Yet, I needed to choose one!

And that’s how an idea of OutOfMemory game prototype materialized! Ladies and gentleman, please meet the first in the world card game about .NET-based high performance and memory-aware programming. Sounds so nerdy, doesn’t it?! That’s by design and I like it! From developer to developers, with love 😉 It contains a huge amount of stuff related to programming, hardware architecture and… GC obviously! This is going to be a physical card game, not a computer or a mobile one.

The goal of the game is to build an application. You build it by playing on the table so-called Feature cards – the first player getting a given amount of Feature points wins!


But each Feature has its cost! Each Feature card allocates Memory and consumes CPU Ticks. At the end of each player’s turn, you add an appropriate amount of Memory. If you hit a given limit – OutOfMemory occurs! CPU Ticks play also an important role in limiting possible actions in a turn.

In each turn, the player takes a single card from a deck. Or two, if she has an appropriate special card which is… Adam Sitnik‘s card (an example of a Hero card). Another example of .NET Hero card is Ben Adams – very powerful as it both reduces Memory and CPU Ticks, has a special ability (removes all the nasty Issues played against you by your opponents) and even adds a single Feature point (having Ben contributing to your app is a feature by itself)!


Guess who is on the other Hero cards?! Currently, I plan eight such cards!

Card(s) taken from the deck can be used immediately or kept at hand (but there is a limit of cards in hand, reflecting CPU cache my dear!)

There are various other types of cards. For example, there are Garbage Collection Action cards so if you are lucky enough (and plan to keep them in advance) you can clean your Memory periodically.


A lot of cards help you to keep Features while reducing their Memory and/or Ticks costs, like Span<T> or Lock-free programming


There are also nasty Bug and Issue cards that you can play against your opponents, removing their Feature points or making their app more allocating and slower!


Additionally, there are various Action cards that can be played to receive a short, single-turn benefit. Some influence only you, some a given opponent, and some all the players – like Black Friday cards that makes all Features double-allocating in the next turn (due to high volume traffic!).


All this is in a very early prototype stage, requiring possibly quite a lot of rethinking. And a lot of balancing is required to create playable and enjoyable deck. Currently, my prototype consists of 80 cards.


I am playing this game a lot with… myself, to balance the very first prototype. When ready, I plan to publish self-printable very rough version and I hope there will be .NET developers out there willing to try it out! With your feedback, we may create an amazing game!

Nevertheless, I would LOVE to start receiving your feedback RIGHT away! Do you like this idea? Do you have ideas of Hero, Bug, Issue, Fix and Feature cards?

If you are want to be informed about further work and the prototype, feel invited to subscribe at a dedicated page!

Note also that this initiative is a part of a bigger Dotnetos initiative – although currently only I am involved in the design of this game, most probably sooner or later all three Dotnetos will be somehow involved in it – I hope so!

Note. All graphics on cards and the cards itself are prototypes and do not reflect the final quality. Moreover, all cliparts were taken from Free Vectors via


I would like to announce with pleasure the initiative of Three Dot Netos. I am very excited because the preparations have been going on for several months. And here it is finally. I can officially and publicly announce it!

But… what?

We get in the car and start on the road through Poland. 5 cities, day by day. Every evening a different city and other people but the same topics – .NET performance, .NET internals and other advanced .NET themes. Hell of a ride for your brain! There will be no mercy. If you’re bored with sessions on .NET at other conferences, now you should be happy! Of course, this is not meant to be an empty talk. All topics discussed will be practical. But we will not repeat again the same boring “reference types are on the heap and value types are on the stack“. Oh no no! Detailed agenda will be announced in a few weeks. But be sure it will be interesting.

In the first edition, we will speak Polish. But who knows what the future will bring. However, if you know some Polish guys – tell them about us! Spread the word, this will always be helpful for planning further initiatives. Please 🙂

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Tune screenshot

I would like to present you a new tool I’ve started to work on recently. I’ve called it The Ultimate .NET Experiment (Tune) as its purpose is to learn .NET internals and performance tuning by experiments with C# code. As it is currently in very early 0.2 version, it can be treated as Proof Of Concept with many, many features still missing. But it is usable enough to have some fun with it already.

The main way of working with this tool is as follows:

  • write a sample, valid C# script which contains at least one class with public method taking a single string parameter. It will be executed by hitting Run button. This script can contain as many additional methods and classes as you wish. Just remember that first public method from the first public class will be executed (with single parameter taken from the input box below the script). You may also choose whether you want to build in Debug or Release mode (note: currently it is only x64 bit compilation).
  • after clicking Run button, the script will be compiled and executed. Additionally, it will be decompiled both to IL (Intermediate Language) and assembly code in the corresponding tab.
  • all the time Tune is running (including time during script execution) a graph with GC data is being drawn. It shows information about generation sizes and GC occurrences (as vertical lines with the number below showing which generation has been triggered).

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