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Are mutexes slow?

In this talk, we'll dive deep into what makes concurrency coordination costly, and explore some pathways to mitigate that cost.

Jon Gjengset
Principal Engineer at Helsing, former owner of Rust at Amazon, Rust educator
About This Talk

Modern hardware is moving to more cores rather than faster ones. For application developers, this means that further performance gains require _parallelism_; making progress on many tasks at the same time. But as anyone with experience writing multi-threaded code will tell you, this is easier said than done — those threads inevitably have to coordinate, and coordination is "expensive."

But _why_ is it expensive? Sure, a mutual exclusion lock forces sequential execution, which limits overall speedup (per Amdahl's law). But is the lock itself expensive? Do reader-writer locks help when the coordination is mostly required for reads? In this talk, we'll dive deep into what makes concurrency coordination costly, and explore some pathways to mitigate that cost. By the end, you'll leave with a mental model that goes all the way down to the CPU cache line, and a newfound appreciation for a protocol from the 1980s.

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Centrum Konferencyjne POLIN, Poland
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