3 ms·
> other network services better than the JVM with its hot spot? JVM hotspot optimization is just band-aid for something Rust does always everywhere naturally?
by nicce 4mo ago
> other network services better than the JVM with its hot spot?
JVM hotspot optimization is just band-aid for something Rust does always everywhere naturally? Assuming that you use lifetimes etc properly and not going to Arc rampage.
- za3faran 4mo agoRust: concat/string time: [77.801 ns 78.103 ns 78.430 ns] change: [+0.0275% +0.3169% +0.6169%] (p = 0.03 < 0.05) Change within noise threshold. formatted/string time: [31.471 ns 31.569 ns 31.699 ns] change: [+0.1277% +0.3915% +0.6788%] (p = 0.01 < 0.05). Change within noise threshold. Java Benchmarks.concat string avgt 15 8.632 ± 0.105 ns/op Benchmarks.format string avgt 15 64.971 ± 1.406 ns/op Java's string concat is faster than rust's offerings.
- deleted 4mo ago[deleted]
- nicce 4mo agoI would be careful with this benchmark even thought it shows JIT efficiency. This is a special case which might not really reflect realworld - string was static? What if you use random string?
- za3faran 4mo agoIt is not a static string, the `param` argument gets passed in each time. I modified the above benchmark to add an int parameter in addition to the `param` argument from before. However now it's testing an itoa as well as it is dependent on the number of iterations the benchmark suite decides to run, so it is not as precise, but Java is still ahead. Java: @Param({"string"}) public String param; public int i = 0; @Benchmark public String concat() { return "prefix " + param + " " + i++ + " suffix"; } Benchmark (param) Mode Cnt Score Error Units Benchmarks.concat string avgt 15 26.591 ± 0.242 ns/op Rust: fn format2(state: &mut BenchState) -> String { let i = state.next_i(); format!("prefix {} {} suffix", state.param, i) } format2 time: [51.923 ns 52.541 ns 53.466 ns] Found 10 outliers among 100 measurements (10.00%) 4 (4.00%) high mild 6 (6.00%) high severe
- chlorion 4mo agoJava is probably able to bump allocate memory or something similar, where rust is using a general purpose allocator. I guess if you are formatting strings constantly this is important, but you can also use a bump allocator in rust if you really wanted to.