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The Computer Language Benchmarks Game has C++ outperforming Rust by around 10% for most benchmarks. Binary trees is 13% faster in C++, and it's not the best C++

The Computer Language Benchmarks Game has C++ outperforming Rust by around 10% for most benchmarks. Binary trees is 13% faster in C++, and it's not the best C++ binary tree implementation I've seen. k-nucleotide is 32% faster in C++. Rust wins on a few benchmarks like regex-redux, which is a pointless benchmark as they're both just benchmarking the PCRE2 C library, so it's really a C benchmark. > because C++ makes it laughably easy to write incorrect code I was going to ask how much you actually program in C++, but I found a past comment of yours: > I frankly don't understand C++ well enough to fully judge about all of this

thedracle 3y ago
I mean, it's outperforming C as well in that particular benchmark. Lies, damn lies, and benchmarks? I can at least say, the performance difference between C, C++, and Rust, is splitting hairs. If you want to write something performant, low level, with predictable timing, all three will work. I'm spending a lot of time building projects with Rust & C++ these days. The issue/tradoff isn't performance with C++, but that C++ is better for writing unsafe code than Rust. https://www.p99conf.io/2022/09/07/uninitialized-memory-unsafe-rust-is-too-hard/ https://www.p99conf.io/2022/09/07/uninitialized-memory-unsaf...
estebank 3y ago
> Rust wins on a few benchmarks like regex-redux, which is a pointless benchmark as they're both just benchmarking the PCRE2 C library, so it's really a C benchmark. The Rust #1 through #6 entries use the regex crate, which is pure-Rust. Rust #7[rust7] (which is not shown in the main table or in the summary, only in the "unsafe" table[detail]) uses PCRE2, and it is interestingly also faster than the C impl that uses PCRE2[c-regex] as well (by a tiny amount). C++ #6[cpp6], which appears ahead of Rust #6 in the summary table (but isn't shown in the comparison page)[comp], also uses PCRE2 and is closer to Rust #7. [comp]: https://benchmarksgame-team.pages.debian.net/benchmarksgame/fastest/rust-gpp.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/... [detail]: https://benchmarksgame-team.pages.debian.net/benchmarksgame/performance/regexredux.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/... [rust7]: https://benchmarksgame-team.pages.debian.net/benchmarksgame/program/regexredux-rust-7.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/... [c-regex]: https://benchmarksgame-team.pages.debian.net/benchmarksgame/program/regexredux-gcc-5.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/... [cpp6]: https://benchmarksgame-team.pages.debian.net/benchmarksgame/program/regexredux-gpp-6.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/...

thedracle 3y ago

I mean, it's outperforming C as well in that particular benchmark. Lies, damn lies, and benchmarks? I can at least say, the performance difference between C, C++, and Rust, is splitting hairs. If you want to write something performant, low level, with predictable timing, all three will work. I'm spending a lot of time building projects with Rust & C++ these days. The issue/tradoff isn't performance with C++, but that C++ is better for writing unsafe code than Rust. https://www.p99conf.io/2022/09/07/uninitialized-memory-unsafe-rust-is-too-hard/ https://www.p99conf.io/2022/09/07/uninitialized-memory-unsaf...

estebank 3y ago

> Rust wins on a few benchmarks like regex-redux, which is a pointless benchmark as they're both just benchmarking the PCRE2 C library, so it's really a C benchmark. The Rust #1 through #6 entries use the regex crate, which is pure-Rust. Rust #7[rust7] (which is not shown in the main table or in the summary, only in the "unsafe" table[detail]) uses PCRE2, and it is interestingly also faster than the C impl that uses PCRE2[c-regex] as well (by a tiny amount). C++ #6[cpp6], which appears ahead of Rust #6 in the summary table (but isn't shown in the comparison page)[comp], also uses PCRE2 and is closer to Rust #7. [comp]: https://benchmarksgame-team.pages.debian.net/benchmarksgame/fastest/rust-gpp.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/... [detail]: https://benchmarksgame-team.pages.debian.net/benchmarksgame/performance/regexredux.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/... [rust7]: https://benchmarksgame-team.pages.debian.net/benchmarksgame/program/regexredux-rust-7.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/... [c-regex]: https://benchmarksgame-team.pages.debian.net/benchmarksgame/program/regexredux-gcc-5.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/... [cpp6]: https://benchmarksgame-team.pages.debian.net/benchmarksgame/program/regexredux-gpp-6.html https://benchmarksgame-team.pages.debian.net/benchmarksgame/...