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Description:

benchmark harness

The Dart project benchmark harness is the recommended starting point when
building a benchmark for Dart.
Interpreting Results #
By default, the reported runtime in BenchmarkBase is not for a single call to
run(), but for the average time it takes to call run() 10 times for
legacy reasons. The benchmark harness executes a 10-call timing loop repeatedly
until 2 seconds have elapsed; the reported result is the average of the runtimes
for each loop. This behavior will change in a future major version.
Benchmarks extending BenchmarkBase can opt into the reporting the average time
to call run() once by overriding the exercise method:
@override
void exercise() => run();
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AsyncBenchmarkBase already reports the average time to call run() once.
Comparing Results #
If you are running the same benchmark, on the same machine, running the same OS,
the reported run times can be carefully compared across runs.
Carefully because there are a variety of factors which
could cause error in the run time, for example, the load from
other applications running on your machine could alter the result.
Comparing the run time of different benchmarks is not recommended.
In other words, don't compare apples with oranges.
Features #

BenchmarkBase class that all new benchmarks should extend.
AsyncBenchmarkBase for asynchronous benchmarks.
Template benchmark that you can copy and paste when building new benchmarks.

Getting Started #
1. Add the following to your project's pubspec.yaml
dependencies:
benchmark_harness: any
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2. Install pub packages
dart pub install
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3. Add the following import:
import 'package:benchmark_harness/benchmark_harness.dart';
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4. Create a benchmark class which inherits from BenchmarkBase or
AsyncBenchmarkBase.
Example #
Create a dart file in the
benchmark/
folder of your package.
// Import BenchmarkBase class.
import 'package:benchmark_harness/benchmark_harness.dart';

// Create a new benchmark by extending BenchmarkBase
class TemplateBenchmark extends BenchmarkBase {
const TemplateBenchmark() : super('Template');

static void main() {
const TemplateBenchmark().report();
}

// The benchmark code.
@override
void run() {}

// Not measured setup code executed prior to the benchmark runs.
@override
void setup() {}

// Not measured teardown code executed after the benchmark runs.
@override
void teardown() {}

// To opt into the reporting the time per run() instead of per 10 run() calls.
//@override
//void exercise() => run();
}

void main() {
// Run TemplateBenchmark
TemplateBenchmark.main();
}
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Output #
Template(RunTime): 0.1568472448997197 us.
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This is the average amount of time it takes to run run() 10 times for
BenchmarkBase and once for AsyncBenchmarkBase.

µs is an abbreviation for microseconds.

Contributions #
This package is carefully curated by the Dart team to exact specifications.
Please open an issue with any proposed changes before submitting a pull
request.
Publishing automation #
For information about our publishing automation and release process, see
https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.