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