Merge pull request #1335 from ethcore/tx_perf

Transaction processing queue

util/src/lib.rs

@@ -154,6 +154,7 @@ pub mod panics;
 pub mod table;
 pub mod network_settings;
 pub mod path;
+mod timer;
 
 pub use common::*;
 pub use misc::*;
@@ -175,6 +176,7 @@ pub use network::*;
 pub use io::*;
 pub use log::*;
 pub use kvdb::*;
+pub use timer::*;
 
 #[cfg(test)]
 mod tests {

util/src/timer.rs

@@ -0,0 +1,51 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// 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()
+	}
+}