https://blog.agical.se/en/authors/peter-stromberg/ (Agical's blog) https://blog.agical.se//apple-touch-icon.png https://blog.agical.se/en/authors/peter-stromberg/ Hugo -- gohugo.io en-EN This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. Fri, 23 May 2025 00:00:00 +0000 https://blog.agical.se/en/posts/a-rich-poor-man-x-s-css-hot-reload/ Fri, 23 May 2025 00:00:00 +0000 https://blog.agical.se/en/posts/a-rich-poor-man-x-s-css-hot-reload/ <p>Hot reloading CSS can be as easy as <code>(require .. :reload-all)</code> followed by <code>(spit css-file css)</code>, at least if you add a file watcher. 😀</p> <p>I’m using <a href="https://github.com/thheller/shadow-cljs"><u>shadow-cljs</u></a> for almost everything I do. Its hot-reloading of code is so damn good that I have grown addicted to it and I now need moar hot reloading everywhere in my life. shadow-cljs also <a href="https://shadow-cljs.github.io/docs/UsersGuide.html#_css_reloading"><u>hot-reloads css files</u></a>, did you know?</p> <p>However, unless you hand-code the actual <code>.css</code> files, what remains is something that will rebuild them when their source code changes. A poor, poor man uses <a href="https://sass-lang.com/"><u>SASS</u></a> or some similar huge dependency for this. But a rich, poor man uses data instead of text. As a Clojurian rich man (but I am repeating myself) I use the <a href="https://github.com/noprompt/garden"><u>Garden CSS library</u></a>. Garden gives me a way to express CSS in Hiccup-ish data. It also comes with a bunch of nice CSS utilities such as unit conversion and color manipulation, making me miss SASS even less.</p><br></br><a href='https://blog.agical.se/en/posts/a-rich-poor-man-x-s-css-hot-reload/'>Read this ↗️</a> https://blog.agical.se/en/posts/the-programming-language-doesn-x-t-matter--until-it-does/ Fri, 27 Sep 2024 00:00:00 +0000 https://blog.agical.se/en/posts/the-programming-language-doesn-x-t-matter--until-it-does/ <p>On LinkedIn, a recipe for raking home the likes and cheering-ons is to post about that the tools do not matter at all, only the people matter.</p> <p>“Yay!”</p> <p>“Thanks for sharing!”</p> <p>“So insightful!”</p> <p>I call bullshit.</p> <p><img src="https://blog.agical.se/images/the-programming-language-doesn-x-t-matter--until-it-does/image1.jpg" /></p> <p>Well, maybe it is true for some, but not for all, and certainly not for me! To me people matter a ton, and so do tools. The amount of matter is on the same order of magnitude for both. This is because I work as a programmer for a reason. I think there is nothing more fun, thrilling, and rewarding to do than to code. It’s where that creative part of me gets its nourishment. As a programmer I create things <em>ex nihilo</em>. My ideas come into existence from under my fingertips, and it is the most wonderful feeling. Also in my spare time you’ll find me coding.</p><br></br><a href='https://blog.agical.se/en/posts/the-programming-language-doesn-x-t-matter--until-it-does/'>Read this ↗️</a> https://blog.agical.se/en/posts/there-can-be-only-one/ Sat, 01 Jun 2024 00:00:00 +0000 https://blog.agical.se/en/posts/there-can-be-only-one/ <p>Here is a stupid simple way to easily manage those UI elements of which there can be only one opened at a time, such as application menus. I call them <a href="https://en.wikipedia.org/wiki/Highlander_(film)"><u>Highlander</u></a>s.</p> <p><img src="https://blog.agical.se/images/there-can-be-only-one!/image1.jpg" /></p> <p>My requirements are that I want no extra DOM elements, nor any extra CSS, plus that the user’s intent should be honored, either if it is intentionally closing the element or starting to interact with some other element. (Say the menu is open and the user starts to drag something somewhere else. That dragging should happen and the menu should also close.)</p><br></br><a href='https://blog.agical.se/en/posts/there-can-be-only-one/'>Read this ↗️</a> https://blog.agical.se/en/posts/keeping-the--arglists-of-clojure-functions-dry/ Mon, 22 Apr 2024 00:00:00 +0000 https://blog.agical.se/en/posts/keeping-the--arglists-of-clojure-functions-dry/ <p><strong>The problem</strong>: <code>function-a</code> takes the same arguments as <code>function-b</code>. In fact, <code>function-a</code> calls <code>function-b</code>. Without too much synchronized updating of the function signatures, I want <code>(doc function-a)</code> to show me the same argument lists as <code>(doc function-b)</code>.</p> <p><strong>The solution</strong>: Use <code>:arglists</code> in the metadata of the function.</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-clojure" data-lang="clojure"><span class="line"><span class="cl"><span class="p">(</span><span class="kd">defn </span><span class="nv">function-b</span> <span class="p">[{</span><span class="ss">:keys</span> <span class="p">[</span><span class="nv">a</span> <span class="nv">b</span> <span class="nv">c</span><span class="p">]}]</span> </span></span><span class="line"><span class="cl"> <span class="p">(</span><span class="nb">println </span><span class="nv">a</span> <span class="nv">b</span> <span class="nv">c</span><span class="p">))</span> </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl"><span class="p">(</span><span class="kd">defn </span><span class="nv">function-a</span> </span></span><span class="line"><span class="cl"> <span class="p">{</span><span class="ss">:arglists</span> <span class="o">&#39;</span><span class="p">([{</span><span class="ss">:keys</span> <span class="p">[</span><span class="nv">a</span> <span class="nv">b</span> <span class="nv">c</span><span class="p">]}])}</span> </span></span><span class="line"><span class="cl"> <span class="p">[</span><span class="nv">args</span><span class="p">]</span> </span></span><span class="line"><span class="cl"> <span class="p">(</span><span class="nf">function-b</span> <span class="nv">args</span><span class="p">))</span></span></span></code></pre></div> <p>That’s the TL;DR. Read on for some rationale, and for some nerdy diving into the worlds of static and dynamic analysis.</p><br></br><a href='https://blog.agical.se/en/posts/keeping-the--arglists-of-clojure-functions-dry/'>Read this ↗️</a> https://blog.agical.se/en/posts/15-second-netlify-deploy-of-a-rust-mdbook/ Wed, 03 Jan 2024 00:00:00 +0000 https://blog.agical.se/en/posts/15-second-netlify-deploy-of-a-rust-mdbook/ <p>I have been enjoying learning some <a href="https://www.rust-lang.org/"><u>Rust</u></a> and some <a href="https://macroquad.rs/"><u>Macroquad</u></a> game development via <a href="https://macroquad-introduktion.agical.se/"><u>Olle Wreede’s tutorial</u></a> (Swedish only so far, sorry!). When I sent some pull requests towards the tutorial I lacked a deployed version attached to the PR. I decided to add that, and my goto for such things is <a href="https://www.netlify.com/"><u>Netlify</u></a>. However, the tutorial is authored with <a href="https://rust-lang.github.io/mdBook/"><u>mdBook</u></a>, and there doesn’t seem to be a straightforward way to get Netlify to build this.</p> <p><img src="https://blog.agical.se/images/15-second-netlify-deploy-of-a-rust-mdbook/image1.jpg" /></p><br></br><a href='https://blog.agical.se/en/posts/15-second-netlify-deploy-of-a-rust-mdbook/'>Read this ↗️</a> https://blog.agical.se/en/posts/why-you-should-try-clojure-interactive-programming/ Wed, 27 Dec 2023 00:00:00 +0000 https://blog.agical.se/en/posts/why-you-should-try-clojure-interactive-programming/ <p><a href="https://clojure.org"><u>Clojure</u></a> has a lot of things going for it. To name just a few: Functional programming is the default. Clojure makes it easy to keep data immutable. The language is small and simple, and the programs you create stay smaller and simpler than with most programming language environments.</p> <p>Still, perhaps Clojure’s super power is Interactive Programming. I.e. <em>using the REPL to connect to, inspect, and modify the running program as you are developing it</em>. As a Clojure developer you can leverage this power for fun and for profit. The Clojure REPL will quickly let you verify that your changes are in the right direction, or give you early feedback that you need to think differently about the problem.</p><br></br><a href='https://blog.agical.se/en/posts/why-you-should-try-clojure-interactive-programming/'>Read this ↗️</a> https://blog.agical.se/en/posts/vs-code-runcommands-for-multi-commands-keyboard-shortcuts/ Mon, 27 Nov 2023 00:00:00 +0000 https://blog.agical.se/en/posts/vs-code-runcommands-for-multi-commands-keyboard-shortcuts/ <p><a href="https://code.visualstudio.com/"><u>Visual Studio Code</u></a> has a command for stringing multiple commands together: <code>runCommands</code>. It’s designed to be used from keyboard shortcuts. Here’s an example:</p><br></br><a href='https://blog.agical.se/en/posts/vs-code-runcommands-for-multi-commands-keyboard-shortcuts/'>Read this ↗️</a> https://blog.agical.se/en/posts/to-chatgpt-a-picture-says-more-than-a-thousand-words/ Thu, 26 Oct 2023 11:20:00 +0200 https://blog.agical.se/en/posts/to-chatgpt-a-picture-says-more-than-a-thousand-words/ <p>One of the great usages I get from generative AI is to use it for checking that my messages come across as I want them to do. ChatGPT, Midjourney and their likes are trained from vast amounts of human communication. To note how they interpret something gets to be a measure on how it would be received by fellow human travelers. At least I contend it is so.</p> <p>Additionally I can “carve out”, with pretty good precision, the specific target group I want to reach with my article, picture, video, email, or whatnot.</p><br></br><a href='https://blog.agical.se/en/posts/to-chatgpt-a-picture-says-more-than-a-thousand-words/'>Read this ↗️</a> https://blog.agical.se/en/posts/imagemagick-with-pango-on-macos-ventura/ Tue, 10 Oct 2023 22:13:00 +0200 https://blog.agical.se/en/posts/imagemagick-with-pango-on-macos-ventura/ <p>In <a href="https://blog.agical.se/en/posts/imagemagick--x--pango--x--babashka--x---x--x-/"><u>ImageMagick + Pango + Babashka = ❤️</u></a> I told you about the Docker image <a href="https://hub.docker.com/r/cospaia/magick-pango-babashka"><u>cospaia/magick+pango+babashka</u></a>, and that it allows for using <a href="https://docs.gtk.org/Pango/pango_markup.html"><u>Pango markup</u></a> with <a href="https://imagemagick.org/"><u>ImageMagick</u></a> locally as well as in CI. I also told you that I haven’t succeeded to install ImageMagic with Pango support on my Mac.</p> <p>Since I wrote that I have tried to figure it out, and when compiling ImageMagick from source failed in some opaque way, all too early in the <code>make</code>, I almost threw in the towel. But then I got an idea. What if…</p><br></br><a href='https://blog.agical.se/en/posts/imagemagick-with-pango-on-macos-ventura/'>Read this ↗️</a> https://blog.agical.se/en/posts/imagemagick--x--pango--x--babashka--x---x--x-/ Tue, 10 Oct 2023 17:01:00 +0200 https://blog.agical.se/en/posts/imagemagick--x--pango--x--babashka--x---x--x-/ <p>If you want to conveniently compose pictures and text programmatically you may want to have a look at <a href="https://imagemagick.org/"><u>ImageMagick</u></a>. Especially when powered by <a href="https://docs.gtk.org/Pango/pango_markup.html"><u>Pango</u></a> markup. The markup is SGML and the resulting text line breaks and flows automatically. It gets quite a lot easier to lay your text out this way, than to use ImageMagic’s built in text facilities. And some things do not only get easier, they become <em>possible</em>.</p> <p>However, first you need to get the ImageMagick + Pango pair installed. Depending on your machine this can get complicated. I still haven’t figured out how to do it on my Mac. (<a href="https://blog.agical.se/en/posts/imagemagick-with-pango-on-macos-ventura/"><u>See here for how I worked around it.</u></a>) As my real use case was to get it to happen in a CI build step, I searched for ImageMagic + Pango Docker images and couldn’t find one that actually worked.</p><br></br><a href='https://blog.agical.se/en/posts/imagemagick--x--pango--x--babashka--x---x--x-/'>Read this ↗️</a> https://blog.agical.se/en/posts/full-source-code--newsletter-automation-using-buttondown--x--google-sheets/ Mon, 02 Oct 2023 00:00:00 +0000 https://blog.agical.se/en/posts/full-source-code--newsletter-automation-using-buttondown--x--google-sheets/ <p>Here’s how I created a fully automated, weekly newsletter using only RSS, <a href="https://buttondown.email"><u>Buttondown</u></a>, and <a href="https://sheets.google.com"><u>Google Sheets</u></a>. Full source code included!</p> <p>I run a hobby project (<a href="https://cospaia.se"><u>Cospaia</u></a>, mostly in Swedish, but it’s not important for this article) together with some friends. We wanted a weekly automated newsletter. When figuring out how to do this, I compared it to a commercial project I’m involved with, where we use <a href="https://www.netlify.com/products/forms/"><u>Netlify Forms</u></a> and <a href="https://mailchimp.com/"><u>Mailchimp</u></a>, with <a href="https://zapier.com/apps/netlify/integrations/mailchimp"><u>Zapier as glue</u></a>. As Mailchimp is pretty crappy, and has a history of biting me really hard (deleting my subscriber database), and we are not hosting the Cospaia site using Netlify, I looked around for other ways to do this one. In the Cospaia project, instead of Netlify we are using <a href="https://vercel.com/"><u>Vercel</u></a>, so Vercel Functions came to mind. I didn’t immediately find something however, like I did with Netlify Forms. This doesn’t mean there isn’t an easy path here, just that Brave Search found <a href="https://css-tricks.com/using-netlify-forms-and-netlify-functions-to-build-an-email-sign-up-widget/"><u>something else</u></a> for me first. It was actually also involving Netlify Forms, but instead of Mailchimp there was something else. It looked super interesting and relevant to what I needed: <strong>Buttondown</strong>! But before digging into the solution, let’s have a look at my requirements.</p><br></br><a href='https://blog.agical.se/en/posts/full-source-code--newsletter-automation-using-buttondown--x--google-sheets/'>Read this ↗️</a> https://blog.agical.se/en/posts/the-stone-soup-is-a-lie/ Tue, 26 Sep 2023 00:00:00 +0000 https://blog.agical.se/en/posts/the-stone-soup-is-a-lie/ <p>Some 20 years ago I worked at a startup with a CEO who liked to cook up various tricks to make potential customers think we were further ahead than we were. I complained that he was setting us and the customers up for failure. I suggested that at the next meeting we should be completely open and honest about what they would buy into. We could leverage it, even. We could tell the customers about the big opportunity to be part of, and shape, our journey. Somewhat to my surprise, he agreed. And to his big surprise, the next meeting landed us our first contract. I was a bit disappointed that he then coined it “the trick of honesty”. I suspect he might still be regarding it as just one of his many tricks. ¯\<em>(ツ)</em>/¯</p><br></br><a href='https://blog.agical.se/en/posts/the-stone-soup-is-a-lie/'>Read this ↗️</a> https://blog.agical.se/en/posts/my-open-source-work-may-june-2023/ Thu, 29 Jun 2023 00:00:00 +0000 https://blog.agical.se/en/posts/my-open-source-work-may-june-2023/ <p><em>The following is my report for the May - June, 2023 period of <a href="https://www.clojuriststogether.org/">Clojurists Together</a> long term sponsoring.</em></p> <p>As usual, the bulk of my open source energy is poured into <a href="https://calva.io/">Calva</a>, a <a href="https://clojure.org/">Clojure</a>/<a href="https://clojurescript.org/">ClojureScript</a>/<a href="https://github.com/clojure/clojure-clr">ClojureCLR</a>/<a href="https://github.com/Tensegritics/ClojureDart">ClojureDart</a>/<a href="https://babashka.org/">Babashka</a>/<a href="https://github.com/babashka/nbb">nbb</a>/<a href="https://marketplace.visualstudio.com/items?itemName%253Dbetterthantomorrow.joyride">Joyride</a>/etcetera development environment that <a href="https://www.youtube.com/watch?v%253DL0-yDtVUWMQ">takes Interactive Programming seriously</a>.</p> <p>I also got to contribute to Clojure related starter projects + was interviewed for <a href="https://flexiana.com/">Flexiana</a>’s new <strong>Clojure Corner</strong> series: <a href="https://flexiana.com/2023/06/clojure-corner-with-pez">Clojure Corner with Peter Strömberg</a></p> <h2 id="calva">Calva</h2> <p>Over at Twitter someone asked me if I was up to something exciting. Implicitly wondering if Calva was about to get some cool new big thing (I think). My answer was that it is mostly about maintenance currently. However,</p><br></br><a href='https://blog.agical.se/en/posts/my-open-source-work-may-june-2023/'>Read this ↗️</a> https://blog.agical.se/en/posts/changing-my-mind--converting-a-script-from-bash-to-babashka/ Tue, 16 May 2023 00:00:00 +0000 https://blog.agical.se/en/posts/changing-my-mind--converting-a-script-from-bash-to-babashka/ <p>Here, a description of one of my many rewrites of shell scripts.</p> <ul> <li><p><strong>From</strong>: bash-plus-a-lot-of-Unix-tools</p></li> <li><p><strong>To</strong>: <a href="https://babashka.org/"><u>Babashka</u></a>-plus-fewer-Unix-tools (zero Unix tools in this case).</p></li> </ul> <p><a href="https://clojure.org/"><u>Clojure</u></a> reaches wherever I want to code something. For shell scripting it is a great choice because Babashka. By old habit I still often start out with bash. I paste a piece of my command line history in a file and go from there. Then when my script stops behaving like I intend it to, and resists my attempts to make it: I regret not doing it with Babashka.</p><br></br><a href='https://blog.agical.se/en/posts/changing-my-mind--converting-a-script-from-bash-to-babashka/'>Read this ↗️</a> https://blog.agical.se/en/posts/how-to-create-a-really-simple-clojureclr-dependency-tool/ Sun, 14 May 2023 00:00:00 +0000 https://blog.agical.se/en/posts/how-to-create-a-really-simple-clojureclr-dependency-tool/ <p>I just published <a href="https://github.com/PEZ/clojure-clr-starter">clojure-clr-starter</a> – <em>A Dockerized CLojureCLR Starter Project</em>, that makes it easy to create a <a href="https://github.com/clojure/clojure-clr">ClojureCLR</a> project, start it and connect a <a href="https://clojure.org/">Clojure</a> editor. This article describes how the project is set up. Surprisingly little glue was needed once <a href="https://github.com/dmiller">David Miller</a> had created <a href="https://github.com/clojure/clr.tools.nrepl">clr.tools.nrepl</a> (a few weeks ago).</p> <p><img src="https://blog.agical.se/images/how-to-create-a-really-simple-clojureclr-dependency-tool/ClojureCLR.jpg" /></p> <p>There is no dependency tooling for ClojureCLR yet (it’s <a href="https://github.com/dmiller/clr.tools.deps">being worked on</a>) so we have to solve a few things ourselves. We need to get ClojureCLR to:</p><br></br><a href='https://blog.agical.se/en/posts/how-to-create-a-really-simple-clojureclr-dependency-tool/'>Read this ↗️</a> https://blog.agical.se/en/posts/extend-vs-code-in-user-space--without-invented-restrictions/ Sun, 02 Apr 2023 00:00:00 +0000 https://blog.agical.se/en/posts/extend-vs-code-in-user-space--without-invented-restrictions/ <p>Let’s break out of an imaginary jail. Let’s hack <a href="https://code.visualstudio.com/"><u>Visual Studio Code</u></a> in all ways it allows for being modified by extensions, but without leaving user space. User space as in “a user of VS Code”, to contrast with “a developer of VS Code extensions”. The imaginary jail being that I thought some extensibility cases are closed to <a href="https://marketplace.visualstudio.com/items?itemName=betterthantomorrow.joyride"><u>Joyride</u></a> and need <a href="https://marketplace.visualstudio.com/search?target=VSCode&amp;category=Programming%20Languages&amp;sortBy=Rating"><u>an extension</u></a> to be implemented. It is not so!</p> <p><img src="https://blog.agical.se/images/extend-vs-code-in-user-space--without-invented-restrictions/image1.jpg" /></p> <h1 id="bliss-in-a-universe-of-vast-possibilities">Bliss in a universe of vast possibilities</h1> <p>With <a href="https://github.com/BetterThanTomorrow/joyride"><u>Joyride</u></a> a whole world of possibilities opens for programmers who want to customize their development environment of choice from user space, as long as that choice is VS Code. Joyride scripts allow us to add those tiny features we miss, or large features, or fully automate our specific workflows, or script our use of ChatGPT, or just about anything. If we can imagine it, Joyride makes it so that we can make it happen.</p><br></br><a href='https://blog.agical.se/en/posts/extend-vs-code-in-user-space--without-invented-restrictions/'>Read this ↗️</a> https://blog.agical.se/en/posts/chatgpt--are-you-holding-it-wrong-x-/ Sat, 10 Dec 2022 00:00:00 +0000 https://blog.agical.se/en/posts/chatgpt--are-you-holding-it-wrong-x-/ <p>As far as productivity boosts go, ChatGPT (which calls itself Assistant), represents the biggest leap in a long time. Especially if our work involves writing. Correctly used, that is. Incorrectly used, ChatGPT can produce pure garbage, although it might look very similar to the valuable help we could have gotten if we had wielded this new tool rightly.</p> <p>Whether it boosts our productivity, by quickly helping us fill in the blanks, or wastes our time with garbage we need to identify and clean up, it will do so using the same engine. ChatGPT is the latest famous and infamous installation of OpenAI’s aligned large language models. At its core the model uses its training data to predict the next word. Much like the help phone keyboards offer us when we are typing.</p><br></br><a href='https://blog.agical.se/en/posts/chatgpt--are-you-holding-it-wrong-x-/'>Read this ↗️</a> https://blog.agical.se/en/posts/a-conversation-with-chatgpt-about-chatgpt/ Wed, 07 Dec 2022 00:00:00 +0000 https://blog.agical.se/en/posts/a-conversation-with-chatgpt-about-chatgpt/ <p>I blurted out ”How are you?” at the start of a session with <a href="https://chat.openai.com/">ChatGPT</a> and it turned into a conversation where I really tried to get the AI to answer this question. It gets appearant that ChatGPT is a good writer, even if it can get stuck and repeat things a bit too often. That the chatbot ”remembers” the conversation and can use it for its answers is very powerful and reveals to me some about how useful this technology is and can become.</p><br></br><a href='https://blog.agical.se/en/posts/a-conversation-with-chatgpt-about-chatgpt/'>Read this ↗️</a> https://blog.agical.se/en/posts/why-i-shrugged-the-agile-yoke/ Wed, 28 Sep 2022 00:00:00 +0000 https://blog.agical.se/en/posts/why-i-shrugged-the-agile-yoke/ <p>“Agile workplace” is a red flag to me. I immediately start to worry if it implies that I am expected to participate in a lot of meetings and rituals, even though I might be on pins and needles to get some bug fixed, or to tweak this or that feature.</p> <p>Is it just me?</p> <p><img src="https://blog.agical.se/images/why-i-shrugged-the-agile-yoke/image1.jpg" /></p> <p>Actually, I like the idea of making it easy and cheap to adjust and to correct directions. I’ve been working with software development in one form or the other for 35 years. I know full well that it is possible to do it in a rigid, heavy, and awful way, ensuring that as many people as possible suffer from anxiety. When I have been given enough influence, I have even nimbly arranged for things to be that way.</p><br></br><a href='https://blog.agical.se/en/posts/why-i-shrugged-the-agile-yoke/'>Read this ↗️</a> https://blog.agical.se/en/posts/shadow-cljs-clojure-cljurescript-calva-nrepl-basics/ Tue, 13 Sep 2022 00:00:00 +0000 https://blog.agical.se/en/posts/shadow-cljs-clojure-cljurescript-calva-nrepl-basics/ <p>This <strong>How to use <a href="https://github.com/thheller/shadow-cljs">shadow-cljs</a> with Calva in a fullstack project</strong> guide will not take the short path of presenting some steps and then ”BOOM there it is!” Instead we are going to look at the pieces involved and how they are composed to create Calva’s connection with the ClojureScript app being developed. The point with this is to give you the knowledge to get yourself past obstacles that a short 1-2-3 step guide might land you in.</p><br></br><a href='https://blog.agical.se/en/posts/shadow-cljs-clojure-cljurescript-calva-nrepl-basics/'>Read this ↗️</a> https://blog.agical.se/en/posts/be-numa-aware-for-the-sake-of-performance/ Wed, 09 Feb 2022 00:00:00 +0000 https://blog.agical.se/en/posts/be-numa-aware-for-the-sake-of-performance/ <p>With <a href="../java-bitset-performance-mystery/">the article about a performance mystery involving Java and BitSets</a>, I got <a href="https://news.ycombinator.com/item?id=30226083">help from Hacker News</a> (and a lot of other sources as well) to investigate and also solve the mystery.</p> <p>However, I haven’t managed to solve the problem that this <a href="https://en.wikipedia.org/wiki/Non-uniform_memory_access">NUMA</a> (+ Docker, in my case) issue is causing me.</p> <blockquote class="twitter-tweet"><p lang="en" dir="ltr">I&#39;m very happy I could find the solution to this mystery. But the solution is quite unsatisfactory for my particular problem, since I can&#39;t use `numctl --membind=0` in the drag-racing environment. Have a look at my bitset solution&#39;s results here: <a href="https://t.co/qPakybLMAw">https://t.co/qPakybLMAw</a> 😭</p><br></br><a href='https://blog.agical.se/en/posts/be-numa-aware-for-the-sake-of-performance/'>Read this ↗️</a> https://blog.agical.se/en/posts/java-bitset-performance-mystery/ Sat, 05 Feb 2022 00:00:00 +0000 https://blog.agical.se/en/posts/java-bitset-performance-mystery/ <p><strong>UPDATE February 6, 2022</strong>: The behaviour seems to be triggered by that the JVM process sometimes gets scheduled on a different NUMA node from where the heap is allocated. I tested this by using this command to run the sieve:</p> <div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="ex">numactl</span> <span class="at">--cpunodebind</span><span class="op">=</span>0 <span class="at">--membind</span><span class="op">=</span>0 java PrimeSieve</span></code></pre></div> <p>On my first try this gave me the error message <code>setting membind: Operation not permitted</code>. The workaround I used was to run the docker container in privileged mode:</p><br></br><a href='https://blog.agical.se/en/posts/java-bitset-performance-mystery/'>Read this ↗️</a> https://blog.agical.se/en/posts/calva-quil-workflow/ Wed, 05 Jan 2022 00:00:00 +0000 https://blog.agical.se/en/posts/calva-quil-workflow/ <p><a href="https://github.com/quil/quil">Quil</a> is a <a href="https://clojure.org">Clojure</a> and <a href="https://clojurescript.org">ClojureScript</a> wrapper around <a href="https://processing.org">Processing</a>. Quil takes <em>learning how to code within the context of the visual arts</em> and applies 10X to it. (I say being a passionate Clojurian.)</p> <p>With Clojure and its REPL comes the promise that you dynamically can tweak and form your sketches, as they are running. That’s what this is article is about. There is a Calva context, but things generally apply accross all Clojure editors/IDEs. I will assume you know some Clojure, but you should be able to follow pretty well regardless, because I also will try to keep this at a beginner’s level. My aim is to leverage Quil to try to explain things in a way that could help you ”see” how the Clojure editor relates to the Clojure REPL. (In case you haven’t yet ”seen” this.)</p><br></br><a href='https://blog.agical.se/en/posts/calva-quil-workflow/'>Read this ↗️</a> https://blog.agical.se/en/posts/mixed-clojure-and-java/ Thu, 30 Dec 2021 00:00:00 +0000 https://blog.agical.se/en/posts/mixed-clojure-and-java/ <p>For whatever reasons, you might sometimes want to develop your program in a mix of <a href="https://clojure.org">Clojure</a> and <a href="https://www.java.com/">Java</a>. (Or some other language that compiles to <code>.class</code> files.)</p> <p>This is actually so easy that nobody has bothered with writing up an article on how to do it. At least not for non-Leiningen projects. Until now, because in processing a pull request on <a href="https://calva.io">Calva</a>, I had reasons to try create a project like this, and I’d like to help you walk a bit straighter of a path than I did.</p><br></br><a href='https://blog.agical.se/en/posts/mixed-clojure-and-java/'>Read this ↗️</a>