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use std::collections::VecDeque;
use std::time::Instant;
const VECDEQUE_LEN: i32 = 100000;
const WARMUP_N: usize = 100;
const BENCH_N: usize = 1000;
fn main() {
if cfg!(miri) {
// Don't benchmark Miri...
// (Due to bootstrap quirks, this gets picked up by `x.py miri library/alloc --no-doc`.)
return;
}
let a: VecDeque<i32> = (0..VECDEQUE_LEN).collect();
let b: VecDeque<i32> = (0..VECDEQUE_LEN).collect();
for _ in 0..WARMUP_N {
let mut c = a.clone();
let mut d = b.clone();
c.append(&mut d);
}
let mut durations = Vec::with_capacity(BENCH_N);
for _ in 0..BENCH_N {
let mut c = a.clone();
let mut d = b.clone();
let before = Instant::now();
c.append(&mut d);
let after = Instant::now();
durations.push(after.duration_since(before));
}
let l = durations.len();
durations.sort();
assert!(BENCH_N % 2 == 0);
let median = (durations[(l / 2) - 1] + durations[l / 2]) / 2;
println!("\ncustom-bench vec_deque_append {:?} ns/iter\n", median.as_nanos());
}
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