[The_rationalist]

Facts: On average rust is 10% slower on the banchmarkgame: https://benchmarksgame-team.pages.debian.net/benchmarksgame/...

But they use llvm instead of gcc for c++, and gcc is in average 20% faster than clang. Therefore, rust is 30% slower, at least on heavily optimised programs.

And hyper is not the fastest http server, but the actix one is one of the fastest yes.

[steveklabnik]

> Facts: On average rust is 10% slower on the banchmarkgame

That does not show it's 10% slower on average; it shows that C++ is 0.9917938291x as fast as Rust. They both have some where they win by 30%, most are closer, Rust is just faster on average.

> But they use llvm instead of gcc for c++,

C++ g++ g++ (Ubuntu 9.2.1-9ubuntu2) 9.2.1 20191008

?

> gcc is in average 20% faster than clang.

Extremely citation needed.

[igouy]

> faster on average

What kind-of time measurements? What kind-of average?

This chart shows some time measurements:

https://benchmarksgame-team.pages.debian.net/benchmarksgame/...

:and the geometric mean is faster for the C++ programs, but the median seems faster for the rust programs.

Statistical artifacts?

[steveklabnik]

> What kind-of time measurements? What kind-of average?

I interpreted the parent to mean a simple average, so I did exactly that: calculated the percentage for each, and averaged them. In the colloquial term, "mean".

[igouy]

typo ? "the colloquial term" is "average", the specific term is "mean".

[The_rationalist]

Geometric mean is the implicit default measurement for benchmarking

[igouy]

> On average rust is 10% slower on the banchmarkgame

If that claim was true …

> gcc is in average 20% faster than clang

and if that claim was true …

then we might guess the rust programs average could be 10% faster than the C++ programs average, if both used the same compiler backend

— because those rust programs were compiled with llvm but those c++ programs were compiled with gcc.