Robert Nystrom
e4c8b49dcc
Change-Id: I1362ada67a02b0ed352612fc29c727e94d8cd254 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/394901 Commit-Queue: Daco Harkes <dacoharkes@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Daco Harkes <dacoharkes@google.com>
67 lines
2.0 KiB
Dart
67 lines
2.0 KiB
Dart
// Copyright (c) 2022, 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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import 'dart:async';
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import 'dart:io';
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import 'dart:isolate';
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const int count = 10000;
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// The benchmark will spawn a long chain of isolates, keeping all of them
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// alive until the last one which measures Rss at that point (i.e. when all
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// isolates are alive), thereby getting a good estimate of memory-overhead per
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// isolate.
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void main() async {
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final onDone = ReceivePort();
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final lastIsolatePort = ReceivePort();
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final startRss = ProcessInfo.currentRss;
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final startUs = DateTime.now().microsecondsSinceEpoch;
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await Isolate.spawn(
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worker,
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WorkerInfo(count, lastIsolatePort.sendPort),
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onExit: onDone.sendPort,
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);
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final result = await lastIsolatePort.first as List;
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final lastIsolateRss = result[0] as int;
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final lastIsolateUs = result[1] as int;
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await onDone.first;
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final doneUs = DateTime.now().microsecondsSinceEpoch;
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final averageMemoryUsageInKB = (lastIsolateRss - startRss) / count / 1024;
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final averageStartLatencyInUs = (lastIsolateUs - startUs) / count;
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final averageFinishLatencyInUs = (doneUs - startUs) / count;
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print('IsolateBaseOverhead.Rss(MemoryUse): $averageMemoryUsageInKB');
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print(
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'IsolateBaseOverhead.StartLatency(Latency): $averageStartLatencyInUs us.',
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);
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print(
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'IsolateBaseOverhead.FinishLatency(Latency): $averageFinishLatencyInUs us.',
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);
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}
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class WorkerInfo {
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final int id;
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final SendPort result;
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WorkerInfo(this.id, this.result);
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}
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Future worker(WorkerInfo workerInfo) async {
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if (workerInfo.id == 1) {
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workerInfo.result.send([
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ProcessInfo.currentRss,
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DateTime.now().microsecondsSinceEpoch,
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]);
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return;
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}
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final onExit = ReceivePort();
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await Isolate.spawn(
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worker,
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WorkerInfo(workerInfo.id - 1, workerInfo.result),
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onExit: onExit.sendPort,
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);
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await onExit.first;
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}
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