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Add benchmark for VecDeque append
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@ -23,3 +23,8 @@ path = "../liballoc/tests/lib.rs"
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[[bench]]
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[[bench]]
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name = "collectionsbenches"
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name = "collectionsbenches"
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path = "../liballoc/benches/lib.rs"
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path = "../liballoc/benches/lib.rs"
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[[bench]]
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name = "vec_deque_append_bench"
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path = "../liballoc/benches/vec_deque_append.rs"
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harness = false
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@ -0,0 +1,48 @@
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(duration_as_u128)]
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use std::{collections::VecDeque, time::Instant};
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const VECDEQUE_LEN: i32 = 100000;
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const WARMUP_N: usize = 100;
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const BENCH_N: usize = 1000;
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fn main() {
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let a: VecDeque<i32> = (0..VECDEQUE_LEN).collect();
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let b: VecDeque<i32> = (0..VECDEQUE_LEN).collect();
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for _ in 0..WARMUP_N {
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let mut c = a.clone();
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let mut d = b.clone();
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c.append(&mut d);
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}
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let mut durations = Vec::with_capacity(BENCH_N);
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for _ in 0..BENCH_N {
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let mut c = a.clone();
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let mut d = b.clone();
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let before = Instant::now();
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c.append(&mut d);
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let after = Instant::now();
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durations.push(after.duration_since(before));
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}
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let l = durations.len();
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durations.sort();
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assert!(BENCH_N % 2 == 0);
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let median = (durations[(l / 2) - 1] + durations[l / 2]) / 2;
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println!(
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"\ncustom-bench vec_deque_append {:?} ns/iter\n",
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median.as_nanos()
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);
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}
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