Systems Engineer · HPC · AI · Ramblings on whatever
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I want AWK to be more well known. It was treated as soem weird-ass tool that somehow works but no one knows why. It's all over the place on StackOverflow whenever we need to select a reagon of a file or something. I didn't apprishate this in the beginning. I was forced to learn `sed` and `awk` bac...
Read more →Yes, I'm _drunk_ right now. Maybe not **drunk** drunk but enough to make me write this (and maybe not remember that I wrote this tomorrow). Just stupid stuff I've thought of over months and years. Also fuck you who made me decide getting drunk tonight is better then writing code. Like, we'd expe...
Read more →This is another subject that is complicated to explain. But is crucial to understand to write efficient code. Especially on embedded systems and integrated GPUs. I explained this with my coworkers recently. I figure to write it down as a reminder. This post mostly references Intel's article on min...
Read more →Yes, this is one of _those_ posts complaning censorship on Gemini again. Consider this as a call for attention as Taiwan (where I live) government tries to push forward a new censorship law. The Digital Intermidary Law[1] is a new law that tries to solve the rampant fake news and disinformation pr...
Read more →So, recently I was on a business trip to Indonesia. I made major security and OpSec preparations due to being forced to use airport and hotel WiFi for a large chunk of my time. Also some physical defence, but that's more personal paranoia, my main goal is to evade large scale, automated attacks. A...
Read more →With Web3 on the headlines all the day. I want to shift my view onto more traditional technologies. Blockchain is a great. Really, especially for transactions. Once I had to wire some money to an overseas bank. It literally took a week from sending to confirmed receiving. The fees are high too. Wi...
Read more →Lupa[1] provides constant basic statistics about the Gemini network. Stats like how many servers are online, number of virtual hosts, TLS distribution, etc.. It's a really cool project. It got me asking.. what kinds of information can I extract from TLGS' index? Furthermore, I want to provide some...
Read more →One problem with the 3 current major Gemini search engines (GUS, Kennedy and TLGS) is the accuracy of their results. Searching anything too specific and they fail. I saw a lot of people writing about this frustration. "Fine, I'll bring bigger guns out" I thought. After days of reading on arXiv ...
Read more →This morning I logged into the server hosting TLGS, my Gemini search engine, and updated a few things. Then I go through the logs to see if anything intresting happened. Ohh... There were attempts to SQL inject through the search query! Yup, Gemini is big enough for security to matter now! It is d...
Read more →Mixtile Blade 3[1] is an intresting dev board. It runs on a RK 3855 SoC, the successor of the RK3399. Which a whole lot of other boards uses. Including QuartzPro64[2], ITX-3588J[3] and Rock Pi 5[4]. The 16GB model Blade 3 is priced at $369, much more expensive then the Rock Pi 5 at 189$ and the ex...
Read more →Sometimes, you just need to handle large file uploads in your web application. Let's say you are writing a web drive. Dealing witch chunked upload can be a pain in most web frameworks. Not in Drogon - not well-known since the maintainers doesn't advertise much - Drogon supports processing large re...
Read more →This is just something on my mind and I'm trying to figure out how to solve. Most web frameworks use a work-stealing thread pool to improve throughput. Maybe one of the threads is overburdened with 100 tasks in its queue. But all the other 15 threads are idle. Other threads should be able to take ...
Read more →Just want to share how powerful this tool is. Infer[1], or FBInfer (since it's written by Facebook), is a static analyzer that can detect cross-function logic errors and potential data race in C, C++ and Objective-C. Which is just amazing. The company I work for runs on a C++ heavy product. Unfor...
Read more →This took me 3 days of on and off work to figure out. So I decide to write it down in case I need it again. And I want this to be more widely known. CMake is the most popular build system (generator) for C++. While test coverage is an important tool to find where bugs can hide. Testing usually tr...
Read more →Lately someone emailed me asking how OpenCL memory migration works. To be specific, when and how to use the `clEnqueueMigrateMemObjects` API when using more then one device. Yeah, the description of it in Khronos's documentation[1] is very unhelpful. Nor is this API used often. I also spent quite...
Read more →I'm a heavy VRChat player. My setup wasn't really good for VR per se. I had a relatively weak PC and limited LAN bandwidth. The upgrade is a bit costly, but I'm happy with the money spent. Also some unexpected issues caused my the upgrade. My setup is weird. Most people have their PC and playsp...
Read more →I feel I ought to explain my position. I think I understand and respect idiomdrottning's view. I just feel misinterpreted. And I'll try my best not to strawman him. If I do, by all means, it's my fault. My fault. I should have make it clear in my post. I mean "secure" by cryptographically secure...
Read more →Amid the current crypto price drop. I want to write about what cryptocurrency is actually useful for. And what I believe Crypto should be used for. Non of those NFT and ICO bulls*it. Or you can think this as my DD for investing in crypto. Or confirming my confirmation bias if you read WSB. At the...
Read more →Spartan[1] is a cool smol internet protocol. It's even simpler than Gemini. There's no TLS, no need for URL parsing and even less status codes! I just wrote my own Spartan client and server - Spartoi[2] in an afternoon, for fun. What I'm not expecting is some parts of it being (slightly) more comp...
Read more →TLGS'[1] crawler has had a crashing issue from the very beginning. The crawler tries to open too many sockets at the same time with the error message "sockets::createNonblockingOrDie: too many open sockets". The crawl dispatcher already limited how many concurrent craws can happen at any time. Fir...
Read more →I've been contacted by several HR people who are looking for a software engineer. It's good. I'm always looking for new challenges. What I can't stand is a large portion of the company decides that they should test the candidate's algorithm skill. Sorry, what? You just said you want to hire a seni...
Read more →Something I caught while running TLGS's crawler. Due to how drogon works. It needs to always successfully open a new socket on TCP connection. Otherwise the entire process is killed. But Gemini does not support multiple requests on the same connection. So it's easy to endup with a lot of open sock...
Read more →One thing I really want to be able to do is to load YouTube and put it in background as my work music. On OpenBSD the playback performance is a meh. Espically on Chromium. Opening a 720p 60FPS YouTube video yeilds ~10% frame drop in YouTube stats. Beyond that, the actual rendering rate feels more ...
Read more →I have been wanting to use OpenBSD for a while after hearing everyone prazing it's superior security. Until then, my only exposure to OpenBSD was installing it on a VM and maintaining Drogon on it. Needless to say, VM performance sucks. Not even Linux can do video playback on a VM without graphics...
Read more →I never expected my initial post about gemini crawlers would trun into a long conversation between crawler developers and server developers. Just saw Sean Conner's post[1] through cosmos about double slashes in URLs. This is just my 2 cents on the matter. RFC3986 section 3.3[2] contains the ABN...
Read more →This website, `clehaxze.tw` (or `gemini.clehaxze.tw` for Gemini) run on basically the same architecture as any modern web applications. A backend that that serves some files, talks to some database, read some files and render templates. It's my passion to make what I made absolutely secure. A back...
Read more →I opened Cosmos today and saw a reply to my previous post about gemini crawler pitfalls[1]. In it (I assume) he complains a crawler sending requests to `gemini://gemini.conman.org/boston/2008/04/30/2008/04/30.1` which is non-existent. Yeah... that's my crawler. I shall fix it. Upon investigatio...
Read more →SilmeVR is an IMU-only open source full body tracker (open firmware + software) for VR. For the non-initiated, normal VR only tracks your head and hands. While full body tracking in addition tracks waist, chest, ankles, and etc.. With FBT you can sit in VR and see your avatar also sitting down, wi...
Read more →If you are browsing from HTTP. You really should get youself a Gemini Browser and browse this on Gemini. I recommend Lagrange. Or feel free to keep using HTTP. I've been on Gemini for more than half a year now. I genuinely feel the geminispace is a great place to be. And to publish my thoughts....
Read more →Just like the common web, crawlers on Gemini can run into similar pitfalls. Though the impact is much lower. The gemtext format is much smaller than HTML. And since Gemini does not support reusing the TCP connection. It takes much longer to mass-crawl a single capsule. Likely I can catch some issu...
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