51 lines
1.6 KiB
Dart
51 lines
1.6 KiB
Dart
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// Times the same extracted blocks the on-device benchmark uses, so the two
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// numbers are like for like.
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:pure_zstd/pure_zstd.dart';
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void main(List<String> args) {
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final bytes = File(args.first).readAsBytesSync();
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final data = ByteData.sublistView(bytes);
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final count = data.getUint32(0, Endian.big);
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final frames = <Uint8List>[];
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final sizes = <int>[];
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var at = 4;
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for (var i = 0; i < count; i++) {
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final length = data.getUint32(at, Endian.big);
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sizes.add(data.getUint32(at + 4, Endian.big));
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at += 8;
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frames.add(Uint8List.sublistView(bytes, at, at + length));
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at += length;
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}
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for (var i = 0; i < frames.length; i++) {
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if (zstdDecode(frames[i]).length != sizes[i]) {
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throw StateError('block $i decoded to the wrong size');
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}
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}
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for (var pass = 0; pass < 20; pass++) {
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for (final frame in frames) {
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zstdDecode(frame);
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}
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}
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final micros = <int>[];
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for (var pass = 0; pass < 60; pass++) {
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for (final frame in frames) {
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final watch = Stopwatch()..start();
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zstdDecode(frame);
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watch.stop();
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micros.add(watch.elapsedMicroseconds);
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}
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}
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micros.sort();
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double q(double f) => micros[(micros.length * f).floor()] / 1000;
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final median = q(0.5);
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stdout.writeln(
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'samples=${micros.length} bytesOut=${sizes.first} '
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'median=${median.toStringAsFixed(3)}ms p10=${q(0.1).toStringAsFixed(3)} '
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'p90=${q(0.9).toStringAsFixed(3)} '
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'MBps=${(sizes.first / 1048576 / (median / 1000)).toStringAsFixed(0)} '
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'sweep113=${(median * 113).toStringAsFixed(0)}ms',
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);
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}
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