Created
July 13, 2015 09:00
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package scratch; | |
import org.openjdk.jmh.annotations.*; | |
import org.openjdk.jmh.infra.Blackhole; | |
import org.openjdk.jmh.runner.Runner; | |
import org.openjdk.jmh.runner.RunnerException; | |
import org.openjdk.jmh.runner.options.Options; | |
import org.openjdk.jmh.runner.options.OptionsBuilder; | |
import java.util.UUID; | |
import java.util.concurrent.TimeUnit; | |
@Warmup(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS) | |
@Measurement(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS) | |
@Fork(1) | |
@State(Scope.Thread) | |
public class LoopStringsBenchmark { | |
public static void main(String[] args) throws RunnerException { | |
Options opt = new OptionsBuilder() | |
.include(LoopStringsBenchmark.class.getSimpleName()) | |
.forks(1) | |
.build(); | |
new Runner(opt).run(); | |
} | |
private String[] strings; | |
@Setup | |
public void setupTest() { | |
strings = new String[100]; | |
for (int i = 0; i < 100; i++) { | |
strings[i] = UUID.randomUUID().toString().substring(0, 10); | |
} | |
} | |
@Benchmark | |
public void testPlus(Blackhole bh) { | |
String combined = ""; | |
for (String s : strings) { | |
combined = combined + s; | |
} | |
bh.consume(combined); | |
} | |
@Benchmark | |
public void testStringBuilder(Blackhole bh) { | |
StringBuilder sb = new StringBuilder(); | |
for (String s : strings) { | |
sb.append(s); | |
} | |
bh.consume(sb.toString()); | |
} | |
@Benchmark | |
public void testStringBuffer(Blackhole bh) { | |
StringBuffer sb = new StringBuffer(); | |
for (String s : strings) { | |
sb.append(s); | |
} | |
bh.consume(sb.toString()); | |
} | |
@Benchmark | |
public void testStringJoiner(Blackhole bh) { | |
bh.consume(String.join("", strings)); | |
} | |
@Benchmark | |
public void testStringConcat(Blackhole bh) { | |
String combined = ""; | |
for (String s : strings) { | |
combined.concat(s); | |
} | |
bh.consume(combined); | |
} | |
} | |
// Java 8 results | |
//# Run complete. Total time: 00:00:51 | |
// | |
// Benchmark Mode Cnt Score Error Units | |
// LoopStringsBenchmark.testPlus thrpt 10 80120.589 ± 18155.538 ops/s | |
// LoopStringsBenchmark.testStringBuffer thrpt 10 595825.572 ± 233297.303 ops/s | |
// LoopStringsBenchmark.testStringBuilder thrpt 10 596329.000 ± 270195.655 ops/s | |
// LoopStringsBenchmark.testStringConcat thrpt 10 428817.984 ± 96583.918 ops/s | |
// LoopStringsBenchmark.testStringJoiner thrpt 10 449707.702 ± 79852.503 ops/s | |
// | |
// | |
// Java 7 results | |
// Benchmark Mode Cnt Score Error Units | |
// LoopStringsBenchmark.testPlus thrpt 10 82123.780 ± 5162.099 ops/s | |
// LoopStringsBenchmark.testStringBuffer thrpt 10 526157.298 ± 67294.995 ops/s | |
// LoopStringsBenchmark.testStringBuilder thrpt 10 579148.486 ± 77417.358 ops/s | |
// LoopStringsBenchmark.testStringConcat thrpt 10 479200.469 ± 57042.272 ops/s |
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