Vyacheslav Egorov
cbdf85ca97
This package provides universal observability functionality for Dart SDK CLI tooling. Any tool can opt-in into observability by starting PerfWitnessServer. This will create a control socket in a fixed location which can be then discovered by perf_witness recorder. TEST=pkg/perf_witness/test Change-Id: I698617a66fed42c6629c348d53964dae3f2148df Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/413683 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Slava Egorov <vegorov@google.com>
43 lines
1.1 KiB
Dart
43 lines
1.1 KiB
Dart
// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Simple binary which continuously does some busy work and generates
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// timeline events.
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import 'dart:async';
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import 'dart:developer';
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import 'package:perf_witness/server.dart';
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import 'package:perf_witness/src/async_span.dart';
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int fib(int i) {
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if (i < 2) return 1;
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return fib(i - 1) + fib(i - 2);
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}
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Future<void> task(int id) async {
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await AsyncSpan.run('task#$id', () async {
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for (var i = 0; i < 10; i++) {
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Timeline.timeSync('fib', () {
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final sw = Stopwatch()..start();
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while (sw.elapsedMilliseconds < 100) {
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fib(10);
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}
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});
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await Future.delayed(Duration(milliseconds: 100));
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}
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});
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}
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void main() async {
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await PerfWitnessServer.start();
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var id = 0;
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while (true) {
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await AsyncSpan.run('task-group-${id ~/ 2}', () async {
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await Future.wait([task(id++), task(id++)]);
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await Future.delayed(Duration(milliseconds: 100));
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});
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}
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}
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