CppCon 2017: Fedor Pikus “C++ atomics, from basic to advanced. What do they really do?”

Why HN readers recommended it

HN recommends it as an enlightening explanation of atomics, caches and memory ordering from a strong presenter.

This is a summary from the source dataset, not an endorsement by Hacker News or the video creator.

Video & recommendation details

Creator / channel

CppCon

Topic

c++ atomics and memory ordering

Format

talk

Level

advanced

HN recommenders in dataset

3

HN mentions in dataset

3

Recommendation years in dataset

2017–2025

These counts and years describe the included Hacker News records; they are not YouTube views or the video’s publication date.

From the original HN conversations

Excerpts from the recorded comments. Follow each source for the full comment and surrounding discussion.

• No, from what I understand, you can't even do it in software anyway due to how the caches work between cores inside the CPU. Watching this was enlightening to say the least (and the presenter is very good): [VIDEO]

• Fedor Pikus has given a number of great talks on the subject at cppcon over the years some links, in no particular order: CppCon 2017: Fedor Pikus “C++ atomics, from basic to advanced. What do they really do? [VIDEO] CppCon 2016: Fedor Pikus “The speed …

• tl;dr: In a multi-threaded context, memory reads and writes can be reordered by hardware. It gets more complicated with shared cache. Imagine that you have core 1 writing to some address at (nearly) the same time that core 2 reads from that. Does core 2 …