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BAEL-1065 Added JMH benchmarks

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This commit is contained in:
iaforek 2017-09-04 21:09:29 +01:00
parent 2127961922
commit 6c43977876
2 changed files with 449 additions and 392 deletions
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36
core-java/pom.xml
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@ -10,6 +10,17 @@
<dependencies> <dependencies>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>1.19</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>1.19</version>
</dependency>
<!-- utils --> <!-- utils -->
<dependency> <dependency>
<groupId>net.sourceforge.collections</groupId> <groupId>net.sourceforge.collections</groupId>
@ -195,6 +206,31 @@
<plugins> <plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<executions>
<execution>
<id>run-benchmarks</id>
<phase>integration-test</phase>
<goals>
<goal>exec</goal>
</goals>
<configuration>
<classpathScope>test</classpathScope>
<executable>java</executable>
<arguments>
<argument>-classpath</argument>
<classpath />
<argument>org.openjdk.jmh.Main</argument>
<argument>.*</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
<plugin> <plugin>
<groupId>org.apache.maven.plugins</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId> <artifactId>maven-compiler-plugin</artifactId>

49
core-java/src/main/java/com/baeldung/string/StringBufferStringBuilder.java
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@ -1,25 +1,46 @@
package com.baeldung.string; package com.baeldung.string;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
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;
public class StringBufferStringBuilder { public class StringBufferStringBuilder {
public static void main(String[] args) { public static void main(String[] args) throws RunnerException {
int iterations = 10000000; Options opt = new OptionsBuilder()
.include(StringBufferStringBuilder.class.getSimpleName())
.build();
System.gc(); new Runner(opt).run();
long startTime = System.currentTimeMillis();
StringBuffer stringBuffer = new StringBuffer("abc");
for (int i = 0; i < iterations; i++) {
stringBuffer.append("def");
} }
System.out.println("Time taken by StringBuffer: " + (System.currentTimeMillis() - startTime) + "ms"); // Time taken by StringBuffer: 394ms
System.gc(); @State(Scope.Benchmark)
startTime = System.currentTimeMillis(); public static class MyState {
StringBuilder stringBuilder = new StringBuilder("abc"); int iterations = 1000;
for (int i = 0; i < iterations; i++) { String initial = "abc";
stringBuilder.append("def"); String suffix = "def";
} }
System.out.println("Time taken by StringBuilder: " + (System.currentTimeMillis() - startTime) + "ms"); // Time taken by StringBuilder: 129ms
@Benchmark
public StringBuffer benchmarkStringBuffer(MyState state) {
StringBuffer stringBuffer = new StringBuffer(state.initial);
for (int i = 0; i < state.iterations; i++) {
stringBuffer.append(state.suffix);
}
return stringBuffer;
}
@Benchmark
public StringBuilder benchmarkStringBuilder(MyState state) {
StringBuilder stringBuilder = new StringBuilder(state.initial);
for (int i = 0; i < state.iterations; i++) {
stringBuilder.append(state.suffix);
}
return stringBuilder;
} }
} }