Dart Benchmark Harness

The Dart project benchmark harness is the recommended starting point when building a benchmark for Dart.

Learning more

You can read more about Benchmarking the Dart VM.

Interpreting Results

By default, the reported runtime is not for a single call to run(), but for the average time it takes to call run() 10 times. 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.

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.


  • BenchmarkBase class that all new benchmarks should extend
  • Two sample benchmarks (DeltaBlue & Richards)
  • Template benchmark that you can copy and paste when building new benchmarks

Getting Started

1. Add the following to your project's pubspec.yaml

    benchmark_harness: any

2. Install pub packages

pub install

3. Add the following import:

import 'package:benchmark_harness/benchmark_harness.dart';

4. Create a benchmark class which inherits from BenchmarkBase


// 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() {
    new TemplateBenchmark().report();

  // The benchmark code.
  void run() {

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

  // Not measures teardown code executed after the benchark runs.
  void teardown() { }

main() {
  // Run TemplateBenchmark


Template(RunTime): 0.1568472448997197 us.

This is the average amount of time it takes to run run() 10 times.

┬Ás is an abbreviation for microseconds.


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.