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Auto merge of #938 - jhod0:time_phases, r=fitzgen
Time phases New module `time_phases` with an RAII timer which prints to stderr, and command-line flag `--time-phases` to enable it. Fixes #933
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| use std::io::{self, Write}; | ||
| use std::time::{Instant, Duration}; | ||
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| /// RAII timer to measure how long phases take. | ||
| #[derive(Debug)] | ||
| pub struct Timer<'a> { | ||
| output: bool, | ||
| name: &'a str, | ||
| start: Instant, | ||
| } | ||
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| impl<'a> Timer<'a> { | ||
| /// Creates a Timer with the given name, and starts it. By default, | ||
| /// will print to stderr when it is `drop`'d | ||
| pub fn new(name: &'a str) -> Self { | ||
| Timer { | ||
| output: true, | ||
| name, | ||
| start: Instant::now() | ||
| } | ||
| } | ||
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| /// Sets whether or not the Timer will print a mesage | ||
| /// when it is dropped. | ||
| pub fn with_output(mut self, output: bool) -> Self { | ||
| self.output = output; | ||
| self | ||
| } | ||
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| /// Returns the time elapsed since the timer's creation | ||
| pub fn elapsed(&self) -> Duration { | ||
| Instant::now() - self.start | ||
| } | ||
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| fn print_elapsed(&mut self) { | ||
| if self.output { | ||
| let elapsed = self.elapsed(); | ||
| let time = (elapsed.as_secs() as f32) | ||
| + (elapsed.subsec_nanos() as f32) / 1e9; | ||
| let stderr = io::stderr(); | ||
| // Arbitrary output format, subject to change. | ||
| writeln!(stderr.lock(), | ||
| " time: {:.3} ms.\t{}", | ||
| time, self.name) | ||
| .expect("timer write should not fail"); | ||
| } | ||
| } | ||
| } | ||
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| impl<'a> Drop for Timer<'a> { | ||
| fn drop(&mut self) { | ||
| self.print_elapsed(); | ||
| } | ||
| } |