Eric Wright discoposse

Migrating a Rails project from MySQL to PostgreSQL

This brief guide is written from my own experience with migrating a large (~5GB) MySQL database to PostgreSQL for a Rails project.

No warranties, guarantees, support etc. Use at your own risk and, as always, ENSURE YOU MAKE BACKUPS FIRST!

I chose [pgloader][1] because it's extremely fast. YMMV.

Replace mysql2 gem with pg in Gemfile.
Update config/database.yml for PostgreSQL. I used [Rails' template][2] as a starting point.

How to add ChatGPT streaming to your Ruby on Rails 7 app!

This guide will walk you through adding a ChatGPT-like messaging stream to your Ruby on Rails 7 app using ruby-openai, Rails 7, Hotwire, Turbostream, Sidekiq and Tailwind. All code included below!

Want more content like this, for free? Check out my free book, RailsAI!

Follow me on Twitter for more Ruby AI at https://twitter.com/alexrudall
Released under the MIT License - use as you wish :)

SGLang already runs on macOS via PyTorch's MPS (Metal Performance Shaders) backend — you can launch a server, send requests, and get responses. But performance on Apple Silicon has been underwhelming. In this post, we describe how we integrated a native MLX execution path into SGLang that delivers up to 5.3× higher throughput while using significantly less memory.

The Problem: PyTorch MPS Overhead

When SGLang runs on macOS with PyTorch MPS, every operation — matrix multiplications, attention, normalization — goes through PyTorch's MPS backend, which translates PyTorch ops into Metal Performance Shaders. This translation layer adds substantial overhead:

Op dispatch overhead: Each PyTorch operation is individually dispatched to MPS, missing optimization opportunities that come from fusing operations together.
Memory duplication: PyTorch loads model weights into MPS memory and allocates a large KV cache, leaving less room for actual inference workloads.
No fused kernels: Op

	<#
	Implements the Unix shell 'which' command using PowerShell.
	original: https://gist.github.com/codingoutloud/6782961
	#>

	function WhichOnes
	{
	if ($args.Count -eq 0)
	{
	# obviously use of 'which' in usage text is a hack (since it is chosen to match the alias)

	# @author Pichaya Morimoto (p.morimoto@sth.sh)

	Problem:

	```bash
	brew install proxychains-ng
	proxychains4 ncat 1.2.3.4 # not working
	```

	There are public workarounds like https://benobi.one/posts/running_brew_on_m1_for_x86/