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C++ and Beyond 2012: Herb Sutter - atomic Weapons 2 of 2

alexsmail · 29.4K views · 2017-11-06 · 1:32:33

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Overview

Part two of Herb Sutter's C++ and Beyond 2012 session on atomic weapons, a deep dive into the C++ memory model, atomics, memory ordering, and hardware behavior. It ends with the modern meaning of volatile.

On Hacker News

HN recommends it as an in-depth, practical introduction to atomics and weak versus strong memory ordering, relevant to ARM and Rust as well as C++.

Recommended by 2 HN people across 2 months · HN mentions 2019–2024

Topics

C, C++, Rust, Go & systems languagesComputer architecture & CPUs
Search by tags
atomicsmemory orderingacquire releaseconcurrencyherb sutter

What people said

chc4 · 2024-08 · Strong recommendation

"Is Parallel Programming Hard, And, If So, What Can You Do About It?" is one of the best books about atomics and concurrency, and my #2 recommendation. [LINK] My #1 actually isn't a book at all, but the two "atomic Weapons" talks by Herb Sutter, which are extremely good. [LINK] [VIDEO]

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NobodyNada · 2023-11 · Strong recommendation

For a more in depth introduction to the topic with a lot of practical code examples, I highly recommend Herb Sutter’s excellent talk: Part 1 [LINK] Part 2 [VIDEO]

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mlindner · 2023-01 · Reference

The book, especially chapter 7 seems to say several things completely opposite to what Herb Sutter did in his famous talk a number of years ago. In the book: > This means that on ARM64, sequentially consistent operations are exactly as cheap as acquire and release operations. Or, rather, that ARM64 Acquire, Release, and AcqRel operations are as expensive as SeqCst. Unlike x86-64, however, Relaxed operations are relatively cheap, as they don’t result in stronger ordering guarantees than necessary. However in Herb Sutter's talk (specifically the second half here: [VIDEO] ) he says that ARMv8 Acquire/Release/AcqRel operations are cheaper than SeqCst. This book seems to claim that x64 is somehow superior to ARMv8, which from my understanding is completely wrong.

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Sources

Video by alexsmail, played through YouTube.

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