openethereum/util/src/timer.rs

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2016-12-11 19:30:54 +01:00
// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
2016-06-19 14:35:42 +02:00
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Performance timer with logging
use time::precise_time_ns;
/// Performance timer with logging. Starts measuring time in the constructor, prints
/// elapsed time in the destructor or when `stop` is called.
pub struct PerfTimer {
name: &'static str,
start: u64,
stopped: bool,
}
impl PerfTimer {
/// Create an instance with given name.
pub fn new(name: &'static str) -> PerfTimer {
PerfTimer {
name: name,
start: precise_time_ns(),
stopped: false,
}
}
/// Stop the timer and print elapsed time on trace level with `perf` target.
pub fn stop(&mut self) {
if !self.stopped {
trace!(target: "perf", "{}: {:.2}ms", self.name, (precise_time_ns() - self.start) as f32 / 1000_000.0);
self.stopped = true;
}
}
}
impl Drop for PerfTimer {
fn drop(&mut self) {
self.stop()
}
}