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The Simple Beauty of XOR Floating Point Compression I recently implemented a small program to visualize the inner workings of a scheme that compresses floating point timeseries by XORing subsequent values. The resulting visualizations are quite neat and made it much easier for me to understand this beautiful algorithm than any of the explanations that I had previously encountered.

A simple query with a big problem Render.com staging pipeline got blocked due to what looked like a simple query SELECT e.id FROM events e JOIN postgres_dbs db ON (e.data ->> ‘serviceId’) = db.database_id LIMIT 1; Can you spot what’s wrong? Let’s read

crystal ruby a gem that allows you to write Crystal code, inlined in Ruby. All you need is a modern crystal compiler installed on your system.

PythonMonkey A Mozilla SpiderMonkey JavaScript engine embedded into the Python VM, using the Python engine to provide the JS host environment.

madge is a developer tool for generating a visual graph of your module dependencies, finding circular dependencies, and giving you other useful info.

Building My First Homelab Server Rack Michael share with us how he built his first homelab server rack, a genuine post without affiliate links so we know he wasn’t bias.

Using Multiple GitHub Accounts If you share laptop for home and work, or doing consultant for clients, you probably know the hassle of using different github account. This short guide help you configure just that, to make your life easiser by having git automatically load the right account based on directory.

pid-controller explainer A PID controller is a way to solve problems with the following formulation: You can change some input to the system, called the process variable You have a sensor which monitors something about the system You want the sensor measurement to be close to some target value, called the set point The PID controller is a good way to decide what the...

Taming PostgreSQL WAL File Growth Have you ever wake up with an alert and look into Postgres datadir you notice pg_wal is growing massively in size? Read on to learn about why this happens, whether you should be concerned, and what you can do about it.

Linux networking This is somewhat a very low level. But recently I found I had not enough knowledge to understand networking at a very fundamental level. What exactly happen when we make a request, how the tcp connection is open, how the package is sent. how it picks which ethernet interface to send to? So I decide to google around and found this. I...

excelize Go language library for reading and writing Microsoft Excel™ (XLAM / XLSM / XLSX / XLTM / XLTX) spreadsheets

vernier Next-generation Ruby 3.2.1+ sampling profiler. Tracks multiple threads, GVL activity, GC pauses, idle time, and more.

pg_basebackup Since Postgres 12, it has built-in support to take a base backup of a PostgreSQL cluster. If you have been glueing together pg_dump, pg_restore, etc you will love this tool too. Pair it with an optinal compression setting to get the best compression rate.

doltgresql Imagine a Postgres with git style log, diff, branch, and merge functionality. This is just that. The company behind it originaly released a MySQL flavored, but now they are taming Postgres.

automq a cloud-native, serverless reinvented Kafka that is easily scalable, manage-less and cost-effective. It uses Object storage(s3, gcs) as the main storage. Using EBS for durable cache layer to accelerate write. It’s 100% compatible with Apache Kafka greater than 0.9.x and not lose any good features of it, but cheaper and better.

drawdb robust and user-friendly database entity relationship (DBER) editor right in your browser. Build diagrams with a few clicks, export sql scripts, customize your editor, and more without creating an account.

glimmer a DSL framework to build GUI app in Ruby. It contains a DSL engine to express he GUI, and a data binding lib to sync GUI with model attributes bidirectionally.

How does Linux nat a ping Pretty much any home computers are behind a NAT, mean multiple computer share a same public ip. In the TCP/UDP packet, there is a port, the pair ip:port can be used to track which host and send the packet back. But ping operate with ICMP, and ICMP packet doesnt have a port field. So how does NAT work...

File Monitoring with eBPF and Tetragon Anytime you start to implement HIPAA, SOC, NIST PCE-DSS, the file integrity monitoring come up? who changed this file? when? what is changed? In this articule, we look into that with Tetragon. Not just for security, say you have a config file, such as an env file that is source before application run, tracking changes to this file...

tetragon owerful real-time, eBPF-based Security Observability and Runtime Enforcement such as monitoring file changes, block operation to file etc.

maxtext a high performance, arbitrarily scalable, open-source, simple, easily forkable, well-tested, batteries included LLM written in pure Python/Jax and targeting Google Cloud TPUs. MaxText typically achieves 55% to 60% model-flop utilization and scales from single host to very large clusters while staying simple and “optimization-free” thanks to the power of Jax and the XLA compiler.