66 lines
1.8 KiB
Dart
66 lines
1.8 KiB
Dart
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// Copyright (c) 2015, the Dart project authors.
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// Copyright (c) 2006, Kirill Simonov.
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//
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file or at
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// https://opensource.org/licenses/MIT.
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import 'dart:convert';
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import 'dart:io';
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import 'package:path/path.dart' as p;
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import 'package:yaml/yaml.dart';
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const numTrials = 100;
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const runsPerTrial = 1000;
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final source = _loadFile('input.yaml');
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final expected = _loadFile('output.json');
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void main(List<String> args) {
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var best = double.infinity;
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// Run the benchmark several times. This ensures the VM is warmed up and lets
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// us see how much variance there is.
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for (var i = 0; i <= numTrials; i++) {
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var start = DateTime.now();
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// For a single benchmark, convert the source multiple times.
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Object? result;
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for (var j = 0; j < runsPerTrial; j++) {
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result = loadYaml(source);
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}
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var elapsed =
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DateTime.now().difference(start).inMilliseconds / runsPerTrial;
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// Keep track of the best run so far.
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if (elapsed >= best) continue;
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best = elapsed;
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// Sanity check to make sure the output is what we expect and to make sure
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// the VM doesn't optimize "dead" code away.
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if (jsonEncode(result) != expected) {
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print('Incorrect output:\n${jsonEncode(result)}');
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exit(1);
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}
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// Don't print the first run. It's always terrible since the VM hasn't
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// warmed up yet.
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if (i == 0) continue;
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_printResult("Run ${'#$i'.padLeft(3, '')}", elapsed);
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}
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_printResult('Best ', best);
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}
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String _loadFile(String name) {
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var path = p.join(p.dirname(p.fromUri(Platform.script)), name);
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return File(path).readAsStringSync();
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}
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void _printResult(String label, double time) {
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print('$label: ${time.toStringAsFixed(3).padLeft(4, '0')}ms '
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"${'=' * ((time * 100).toInt())}");
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}
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