Service Workers are coming to Safari, it seems. This is my most anticipated and waited web platform feature (or whatever). Really. I’ve known the technology, played with it and deployed it into production on two web apps but it has always irritated me to not have it available for all users. Of course, the platform … [Read more…]
Setting up End-to-End testing (for Nyssetutka.fi) using Nightwatch.js, Selenium and ChromeDriver and running the tests in a headless Chrome instance was super easy. Update 12/2017: since many people are arriving here from Google, please do share any and all ideas you have if you think this post could be improved somehow. Thanks! Since I didn’t … [Read more…]
Very short version: check that you’re not running out of RAM and/or swapping really works. Notice that swapping is completely off on EC2 Ubuntu AMIs even if it’s on everywhere else. Longer version below. Notice the gap on the graph. That’s the time when my AWS micro instance went completely janky and stopped responding to … [Read more…]
I’m just going through and grading students’ code from an exercise where they had to implement barrier synchronization in C++ using condition variables and what not. Someone wrote this: if ( ++finished_threads_ == threads_ ) { … } This pains me. It was a group of three students. Did everyone understand this? Is each and … [Read more…]
Tietotekniikan lai…laboratorio hakee kurssiassareita lukuvuodelle 2017-2018. Hae meille töihin, suosittelen! Olen ollut Pervasivella jo liki kaksi vuotta aloitettuani kesätöissä 2015. Olen päässyt tekemään monia mielenkiintoisia asioita: harjoitusten pitoa, harjoitustöiden tarkistuksia, harjoitustöiden suunnittelua, erilaisten opetusjärjestelmien ylläpitoa ja suunnittelua, harjoitustöiden mallitoteutuksia, tenttien suunnittelua, tenttien tarkistamista ja olin toisena kesätyönäni kurssin vastuuhenkilönä vastaten sen kesätoteutuksesta. Olen tehnyt töitä Johdatus … [Read more…]
I have a game project at the Uni. We’re implementing it in Java. I’ve never done any real Java except for some Android and Hadoop playing around. But you know, I know the syntax… eh. I needed a switch. I thought I really shouldn’t use a switch since every time I’ve used one there has been a … [Read more…]
I use {Track:js} to track my client-side JavaScript errors that happen in the browser. It works like so: TrackJS’s JS snippet is included in the page. The script wraps the global window.onerror handler (among other things) and starts waiting for an error to happen. When an exception is thrown from the browser’s JS runtime TrackJS … [Read more…]
“An unexpected error has occurred during recovery” was the error message I got after trying to recover my Acer C740 Chromebook with multiple different USB sticks flashed with the Chrome Recovery tools by two different computers. The recovery process would always start by the verification of the USB stick and then end in the stated … [Read more…]
I had a problem with my Doorbell.io integration: it caused my site to flash or flicker, if you will. This post is written for those who try to find the answer from google and aren’t able to debug it themselves. First of all: load https://doorbell.io a couple of times and pay attention to the size of … [Read more…]
I really like it when something is well done. And Doorbell.io truly is. It’s a user feedback collection tool that integrates very nicely with, ehm, like everything. I’d say it’s one of those services I find myself wanting to use even if I don’t necessarily need it for anything. It’s just so cool, nicely integrated, … [Read more…]