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In most of those benchmarks rust is slower because it lacks SIMD support, not because of compiler optimizations.
Or rather, Rust is slower on those because SIMD is currently only supported on nightly, and the benchmarks game chooses to use stable Rust exclusively.
2. How many years already has SIMD not supported on stable been posted as a response in these discussions ?
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Or rather, Rust is slower on those because SIMD is currently only supported on nightly, and the benchmarks game chooses to use stable Rust exclusively.
1. Have those Rust programs already been rewritten to use SIMD and measured ? 2. How many years already has SIMD not supported on stable been posted as a response in these discussions ?
2. 1.75, which is coincidentally how long a stable version of Rust has existed. :P
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I also don't work with VS Release Candidates for production code, as such I think it is faire to use only stable Rust.
From what I've seen, most of the Rust community agrees that using stable a perfectly fine choice; kibwen is offering context, not complaining.
Offering context? ;-)
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It's 64 lines of rs, hardly enough to demonstrate anything for the real use, and it's suspiciously badly written, if I understand correctly: The C code: void integrator_leapfrog_part1(int n_particles, double x[][3], double v[][3], double half_time_step){ for (int i=0;i The Rust code: const N_PARTICLES: usize = 2; ... fn main() { ... while time The way I understand it, with the C code the compiler during the compilati…
>The N-Body on this site As noted elsewhere in here, the C implementation is using SSE, whereas the Rust implementation isn't. It's just as much of an unfair comparison as the one you're describing. :P
If so then an equivalent Rust program would be welcome.
If not then it's hardly unfair to compare what actually is provided in current Rust stable to what actually is provided in an old C compiler (gcc 5.4.0).
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1. Have those Rust programs already been rewritten to use SIMD and measured ? 2. How many years already has SIMD not supported on stable been posted as a response in these discussions ?
1. Yes, but nobody's bothered to submit them because there's no point. 2. 1.75, which is coincidentally how long a stable version of Rust has existed. :P
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>The N-Body on this site As noted elsewhere in here, the C implementation is using SSE, whereas the Rust implementation isn't. It's just as much of an unfair comparison as the one you're describing. :P
Does current Rust stable provide equivalent SSE support? If so then an equivalent Rust program would be welcome. If not then it's hardly unfair to compare what actually is provided in current Rust stable to what actually is provided in an old C compiler (gcc 5.4.0).
Yes, stable Rust provides equivalent SSE support to the language specified as ISO 9899:2011. :P
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1. Yes, but nobody's bothered to submit them because there's no point. 2. 1.75, which is coincidentally how long a stable version of Rust has existed. :P
I hope that one-day real-soon-now the much talked of SIMD support makes it into Rust stable.
Earlier quoted context omitted.
Or rather, Rust is slower on those because SIMD is currently only supported on nightly, and the benchmarks game chooses to use stable Rust exclusively.
I also don't work with VS Release Candidates for production code, as such I think it is faire to use only stable Rust.
Earlier quoted context omitted.
I hope that one-day real-soon-now the much talked of SIMD support makes it into Rust stable.
There's a pre-RFC being passed around privately right now, I'm happy to say that your cherished dream will soon become a reality. :)
Earlier quoted context omitted.
Does current Rust stable provide equivalent SSE support? If so then an equivalent Rust program would be welcome. If not then it's hardly unfair to compare what actually is provided in current Rust stable to what actually is provided in an old C compiler (gcc 5.4.0).
> Does current Rust stable provide equivalent SSE support? Yes, stable Rust provides equivalent SSE support to the language specified as ISO 9899:2011. :P