Raunak Ramakrishnan

Programmer | Loves functional programming, simplicity, building backend systems | Dabbles in AI/ML

[KC Sivaramakrishnan @kc_srk]

I'm offering "Functional Programming with OCaml" on the NPTEL platform in July 2026 sem. Enrollment is open now.

The first 8 modules of the interactive book should be fairly stable. The rest is still in development. Sharing early in the spirit of building in the open.

[Casey Muratori @cmuratori]

[1/2] I don't normally make commentary videos, but after seeing the entirety of Eric Schmidt's University of Arizona commencement speech, I felt like there was a lot more going on than just "CEO mentions AI, gets booed". So I made a video to explain what upset me about it.

[Alexandre Becholey @0xabe_io]

Chapter 2 of the ARM hypervisor series is out.
We go over taking ownership of the page tables, memory configuration, copying the current tables, verifying that everything is squared away before committing to the switch.
https://t.co/NZwETYsnQn

[Daniel Lemire @lemire]

DNS records in zone files add up to gigabytes. The simdzone C library can parse them at gigabytes per second. It is part of the popular NSD and likely in a server near you.

Details at…

Parsing Millions of DNS Records per Second, Software: Practice and Experience 55 (4), 2025
https://t.co/6Aus43aZ2j

[Raunak Ramakrishnan @QuixoticCoder]

ARM64 kernel now supports echoing user input. 372 bytes! It was fun getting backspace working on a UART!

Code: https://t.co/pG1yoDzU2K

#qemu #arm64 #osdev

[Raunak Ramakrishnan @QuixoticCoder]

@SebAaltonen Here's an HTTP server I made in ARM64 assembly, compiles to a ~620 byte binary: https://t.co/yi544r6jcc

[Raunak Ramakrishnan @QuixoticCoder]

Is there any cheap (<$100) ARM64 board/device/smartphone which supports nested virtualization? The RaspberryPi 4/5 don't seem to support it.
#virtualization #arm64

[Raunak Ramakrishnan @QuixoticCoder]

Wrote a Brainfuck interpreter in ARM64 assembly (460 bytes). Here's it running a Mandelbrot set calculation
Code: https://t.co/HVGlOQWbrt

#arm64 #linux

[Raunak Ramakrishnan @QuixoticCoder]

ARM64 kernel now supports echoing user input. 372 bytes! It was fun getting backspace working on a UART!

Code: https://t.co/pG1yoDzU2K

#qemu #arm64 #osdev

[Raunak Ramakrishnan @QuixoticCoder]

@abhi9u Have been building minimal programs in ARM64 assembly over the last few weeks:
1. HTTP server: https://t.co/yi544r6jcc
2. Threads using clone3: https://t.co/fn5qGp3ZA2
3. Toy kernel: https://t.co/pG1yoDzmdc
4. JIT calculator: https://t.co/76zVxQcUBL

[Raunak Ramakrishnan @QuixoticCoder]

Wrote an ARM64 implementation of `kill -9`. Compiles to a 208 byte ELF! The fun part was writing an `atoi` implementation for unsigned ints and reading `pid` from `argv[1]`
cc @abhi9u
Code: https://t.co/ZZ6tUw2yoy

[Raunak Ramakrishnan @QuixoticCoder]

Code: https://t.co/pG1yoDzmdc

[Raunak Ramakrishnan @QuixoticCoder]

Built a tiny ARM64 ELF kernel which boots in a UEFI shell on QEMU. The kernel prints "Hello World\n" on UART. It compiles to a 193 byte binary.

Learning a lot about bootloaders, ARM64 device trees, QEMU. Would love links to useful resources and tips for debugging

[Raunak Ramakrishnan @QuixoticCoder]

Hand-crafted ELF using ARM64 assembly (no linker!): https://t.co/xbwmoIXI5z

Wrote the ELF headers in the assembly file. Uses `as` to create the object file and `objcopy` to fish out the ELF. Overhead of ELF and program headers is 120 bytes. Actual code is 12 bytes.
#linux #arm64

[Raunak Ramakrishnan @QuixoticCoder]

@AdiPolak C was the first programming language I learned. Will recommend Python as an introduction to programming. C (or Rust/Zig when they become more mature) can be used as an introduction to systems programming.

[Raunak Ramakrishnan @QuixoticCoder]

@danluu As the "git person" in one of my previous workplaces I always made a local copy of repo before any changes so, we had a backup in case things went wrong. Though credit to git's internals, we never had to fallback to the copied repo.

[Raunak Ramakrishnan @QuixoticCoder]

@hillelogram Shell scripts for screen capture, screen capture with audio, snipping start/end of video, creating video from an image+audio track , all using ffmpeg

[Raunak Ramakrishnan @QuixoticCoder]

5 npm tips to make your dev machine safer -
1. NEVER run npm install -g as root
2. Use nvm
3. Remove unnecessary global packages
3. npm audit
4. Use npx where possible
https://t.co/6FNXp9iLMQ

[Raunak Ramakrishnan @QuixoticCoder]

@vamchale Try out M4 for more fun with this ( https://t.co/TAobKCGtW7 )