Confessions of a Code Addict | Abhinav Upadhyay | Substack

Why This Python Performance Trick Doesn’t Matter Anymore

A deep dive into Python’s name resolution, bytecode, and how CPython 3.11 quietly made a popular optimization irrelevant.

READ THE LATEST

Most Popular

What Every Developer Should Know About GPU Computing

Oct 18, 2023 • Abhinav Upadhyay

How Unix Spell Ran in 64kB RAM

Jan 12 • Abhinav Upadhyay

How Many Lines of C it Takes to Execute a + b in Python?

Dec 6, 2023 • Abhinav Upadhyay

Two Threads, One Core: How Simultaneous Multithreading Works Under the Hood

Jul 24, 2024 • Abhinav Upadhyay

Recent posts

31:44

Making System Calls in x86-64 Assembly

Watch now | Privilege levels, syscall conventions, and how assembly code talks to the Linux kernel

Jun 16 •

Abhinav Upadhyay

One Law to Rule All Code Optimizations

A systems-level reasoning model for understanding why optimizations succeed or fail.

Jun 8 •

Abhinav Upadhyay

Debugging X86-64 Assembly with GDB

Watch now (20 mins) | Learn how to inspect registers, step through instructions, and investigate crashes using GDB.

May 26 •

Abhinav Upadhyay

19:40

Building (and Breaking) Your First X86 Assembly Program

We build a minimal X86 assembly program, run it… and hit a crash. But that crash is exactly what makes this program worth writing.

May 16 •

Abhinav Upadhyay

The System-Level Foundation of Assembly

Tracing how the CPU, OS, and ELF format shape the structure of your assembly code

May 5 •

Abhinav Upadhyay

#nojs-banner { position: fixed; bottom: 0; left: 0; padding: 16px 16px 16px 32px; width: 100%; box-sizing: border-box; background: red; color: white; font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"; font-size: 13px; line-height: 13px; } #nojs-banner a { color: inherit; text-decoration: underline; } This site requires JavaScript to run correctly. Please turn on JavaScript or unblock scripts