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feat: use hint::black_box for benchmark evaluation (#47)

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* this prevents cases where subsequent invocations of a solution fully unroll it, leading to deceivingly low execution times being reported.
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Felix Spöttel 2023-12-06 10:08:35 +01:00 • committed by GitHub
parent a9dcd181aa
commit c241820c41
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1 changed files with 2 additions and 1 deletions
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3
src/template/runner.rs
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@ -1,6 +1,7 @@
/// Encapsulates code that interacts with solution functions. /// Encapsulates code that interacts with solution functions.
use crate::template::{aoc_cli, Day, ANSI_ITALIC, ANSI_RESET}; use crate::template::{aoc_cli, Day, ANSI_ITALIC, ANSI_RESET};
use std::fmt::Display; use std::fmt::Display;
use std::hint::black_box;
use std::io::{stdout, Write}; use std::io::{stdout, Write};
use std::process::Output; use std::process::Output;
use std::time::{Duration, Instant}; use std::time::{Duration, Instant};
@ -64,7 +65,7 @@ fn bench<I: Clone, T>(func: impl Fn(I) -> T, input: I, base_time: &Duration) ->
// need a clone here to make the borrow checker happy. // need a clone here to make the borrow checker happy.
let cloned = input.clone(); let cloned = input.clone();
let timer = Instant::now(); let timer = Instant::now();
func(cloned); black_box(func(black_box(cloned)));
timers.push(timer.elapsed()); timers.push(timer.elapsed());
} }