Using package:pool to parallelize work across multiple processes

poolexample.dart

import 'dart:async';
import 'dart:io';
import 'package:pool/pool.dart';

Pool pool = Pool(8);

main() async {
  final input = List<int>.generate(80, (i) => i);
  final results = pool.forEach(
    input,
    _convertToString,
  );
  await for (String result in results) {
    print(result);
  }
}

/// Converts [i] to string "Result i" by calling `echo`.
/// Also calls `sleep` to simulate a long-running process (otherwise
/// `echo` is too quick).
Future<String> _convertToString(int i) async {
  await Process.run('sleep', ['1']);
  return (await Process.run('echo', ['Result $i'])).stdout;
}