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[vm/benchmark] Improve LongStringCompare benchmark.

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Follow-up to address comments on https://dart-review.git.corp.google.com/c/sdk/+/269380

BUG=https://github.com/dart-lang/sdk/issues/50190
TEST=ci

Change-Id: I5a979a4504e205f493ee71c74d405f1b65246781
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/269602
Reviewed-by: Stephen Adams <sra@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>
This commit is contained in:
Alexander Aprelev 2022-11-16 18:32:07 +00:00 committed by Commit Queue
parent 8c2ea24b78
commit d1e76c6ea0
1 changed files with 23 additions and 19 deletions
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42
benchmarks/StringCompare/dart/LongStringCompare.dart
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@ -6,41 +6,45 @@
import 'package:benchmark_harness/benchmark_harness.dart';
class LongStringCompare extends BenchmarkBase {
late String s, t;
int equalCount = 0;
String generateLongString() {
var s = "abcdefgh";
for (int i = 0; i < 20; i++) {
s = "$s ghijkl $s";
}
return s;
class LongStringCompare extends BenchmarkBase {
final int reps;
final List<String> s = [];
String generateLongString(int lengthPower) {
return "abc" * (1 << lengthPower) + "def";
}
LongStringCompare() : super('LongStringCompare') {
s = generateLongString();
t = s;
// Difference in two strings goes in the middle.
s += "." + s;
t += "!" + t;
LongStringCompare(int lengthPower, this.reps)
: super('LongStringCompare.${1 << lengthPower}.${reps}reps') {
final single = generateLongString(lengthPower);
s.add(single + "." + single);
s.add(single + "!" + single);
}
@override
void warmup() {
for (int i = 0; i < 4; i++) {
for (int i = 0; i < reps / 2; i++) {
run();
}
}
@override
void run() {
bool b = true;
for (int i = 0; i < 5; i++) {
b &= (s == t);
for (int i = 0; i < reps; i++) {
// Make string comparison code hoisiting harder for the compiler to do.
bool comparison = s[i % 2] == s[(i + 1) % 2];
if (comparison) {
equalCount++;
}
}
}
}
void main() {
LongStringCompare().report();
LongStringCompare(1, 3000).report();
LongStringCompare(5, 1000).report();
LongStringCompare(10, 30).report();
if (equalCount > 0) throw StateError("Unexpected equalCount: $equalCount");
}