[pmoriarty]

What's the advantage of doing this over using cython or pypy?

[sametmax]

More perfs since you are going lower level. You are not limited by cython types or pypy git warming up. You can use the full range of c libs AND rust libs. You benefit from the cargo build tools.

[oakridge]

I'm not sure how different this is with Cython since you can also write C/C++ code with it, and hence use any C/C++ libraries. I say that the benefit offered by the example is more of bringing the Rust ecosystem to Python than solving performance issues.

[sametmax]

Well, with cython, either you write python compiled to C, and you won't match rust perf nor types, or you write c/c++ and bind it to python, and you won't match rust safetiness.

[rjeli]

why would rust have better performance than cython? cython is as fast as C

[coldtea]

Cython just transpiles to C. It's not "as fast as C", it's as fast as the runtime support structures it uses, and the communication with Python allows.

[ogrisel]

You can write very efficient Cython code but it's true that in this case, you tend to adopt a lower level code style that is very close to C/C++. Basically, you need to think about the C/C++ code that will be generated by Cython.

C/C++ compilers might be able to generate more optimized native code than what rutsc does though. Actually, this is a question: how good is rustc with numerical / math intensive code? For instance, does it implements loop unrolling and SIMD vectorization?

[rjeli]

yes, exactly as I said.

[toyg]

Total layman here, but I thought one would use Rust because it’s easier to write “safe” code with it than C/C++, while maintaining an equivalent low-level speed advantage.

[baq]

you should also quote "easier" ;)

it's certainly easier once you sacrifice a goat to the compiler to stop insulting you and your mother.

disclaimer: i love rust

[sametmax]

Well it's better than your client insulting you and your mother because your software killed their goat by mistake.

[danilocesar]

lol. It's sad that I can only upvote this once :)

[fulafel]

Cython is unsafe.

[fermigier]

It's much easier to learn Cython once you know Python. That's the biggest selling point.

[the_mitsuhiko]

But the tooling is terrible in comparison. I find rust sigificantly easier as a python developer than cython. There is so much more rust ecosystem to take advantage of.

[tdbgamer]

To be fair to Cython, they have access to the entire C++ stdlib, so that's a fairly good amount of tooling. The main thing is lacks is good documentation and memory safety.

[the_mitsuhiko]

And C++ has absolutely no package distribution system at this point.

[tdbgamer]

Cython deceptively similar to Python with a lot of the pitfalls of C baked in. I personally found their documentation lacking and had to read through tons of Cython projects to discover how it behaved in many scenarios. I've had a much better experience with Rust documentation in comparison.