rust 计算运行耗时代码模板

fn main() {
    use std::time::Instant;
    let now = Instant::now(); //计算耗时

//=====================================================






//=====================================================


    //计算耗时
    let duration = now.elapsed();
    let s = duration.as_secs();
    let mut ms = duration.as_millis();
    let mut us = duration.as_micros();
    us -= ms * 1000;
    ms -= s as u128 * 1000;
    println!("耗时：{} s {} ms {} us", s, ms, us);

    println!("EXIT");
}

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