So at work we had a piece of code that was parsing a bit of a http response and decided to write it in cpp and rust to see which was quicker. I ended up with the two bits of code below. The only issue is my cpp codes takes 800ms and the rust code takes 2.1 Seconds. I know this is a silly micro bench…

I think the str::split methods are not very well optimized. This version which iterates over the bytes of the string and works more like the C++ code is about 2.5x faster than the original Rust, on my machine: fn parse_http(s: &str) -> Result<(&str, &str, &str), &str> { let mut bytes = s.as_byt…

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help

H2CO3 February 23, 2021, 6:01pm 2

Are you compiling both pieces of code with optimizations enabled? (E.g. -O2 -flto for C++ and cargo build --release for Rust.)

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