How a Single Line of Code Made a 24-core Server Slower Than a Laptop | Piot

Imagine you wrote a program for a pleasingly parallel problem, where each thread does its own independent piece of work, and the threads don’t need to coordinate except joining the results at the end. Obviously you’d expect the more cores it runs on, the faster it is.

How a Single Line of Code Made a 24-core Server Slower Than a Laptop | Piot