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Rust's lack of fast thread-local storage makes it a non-starter for me. It's really disappointing, especially when the language has incorporated so many other

Rust's lack of fast thread-local storage makes it a non-starter for me. It's really disappointing, especially when the language has incorporated so many other excellent performance improvements like Google's SwissTable and pattern-defeating quicksort. https://github.com/rust-lang/rust/issues/29594 https://github.com/rust-lang/rust/issues/29594 https://matklad.github.io/2020/10/03/fast-thread-locals-in-rust.html https://matklad.github.io/2020/10/03/fast-thread-locals-in-r...

roblabla 5y ago
FWIW, Rust does have fast thread locals, but only in nightly. https://github.com/rust-lang/rust/issues/29594 https://github.com/rust-lang/rust/issues/29594
- infamouscow 5y ago
  How many companies are running Rust nightly in production?
  - roblabla 5y ago
    According to the 2020 Rust Survey[0], a decent amount. The majority is on stable rust, but a bit less than a third of rust users are on nightly. The company I work at uses a pinned nightly rust in order to access some soon-to-be-stabilized features that simplify our life a bit. We update our pinned nightly in lockstep with stable rust releases. In practice, we've almost never had problems with using nightly rust - those are still very well tested, and problems are caught early and fast. The Rust test suite is quite thorough! However, we do try to avoid using features that don't have a clear trajectory towards stabilization, so for us to consider thread_locals, we'd need to have some very solid proof that it would fix some critical performance problems. I suspect every org will have their own policy, and while the majority will use stable rust, it's not like nightly rust is completely unthinkable. [0]: https://blog.rust-lang.org/2020/12/16/rust-survey-2020.html https://blog.rust-lang.org/2020/12/16/rust-survey-2020.html
    - infamouscow 5y ago
      This survey says about half of the responders are using Rust in production (or at work in some capacity). It doesn't say anything about what percentage of those surveyed AND use Rust at work are ALSO using stable vs nightly.
Jweb_Guru 5y ago
Yup this is the #1 annoying performance issue in Rust. It would probably require a few language extensions to make work safely, but nothing insurmountable I don't think.

roblabla 5y ago

FWIW, Rust does have fast thread locals, but only in nightly. https://github.com/rust-lang/rust/issues/29594 https://github.com/rust-lang/rust/issues/29594

infamouscow 5y ago
How many companies are running Rust nightly in production?
- roblabla 5y ago
  According to the 2020 Rust Survey[0], a decent amount. The majority is on stable rust, but a bit less than a third of rust users are on nightly. The company I work at uses a pinned nightly rust in order to access some soon-to-be-stabilized features that simplify our life a bit. We update our pinned nightly in lockstep with stable rust releases. In practice, we've almost never had problems with using nightly rust - those are still very well tested, and problems are caught early and fast. The Rust test suite is quite thorough! However, we do try to avoid using features that don't have a clear trajectory towards stabilization, so for us to consider thread_locals, we'd need to have some very solid proof that it would fix some critical performance problems. I suspect every org will have their own policy, and while the majority will use stable rust, it's not like nightly rust is completely unthinkable. [0]: https://blog.rust-lang.org/2020/12/16/rust-survey-2020.html https://blog.rust-lang.org/2020/12/16/rust-survey-2020.html
  - infamouscow 5y ago
    This survey says about half of the responders are using Rust in production (or at work in some capacity). It doesn't say anything about what percentage of those surveyed AND use Rust at work are ALSO using stable vs nightly.

Jweb_Guru 5y ago

Yup this is the #1 annoying performance issue in Rust. It would probably require a few language extensions to make work safely, but nothing insurmountable I don't think.