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Demonstration of JMH and StringBuilder/StringBuffer performance - original blog at http://alblue.bandlem.com/2016/04/jmh-stringbuffer-stringbuilder.html
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>string-benchmark</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<name>StringBenchmark</name>
<prerequisites>
<maven>3.0</maven>
</prerequisites>
<dependencies>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<jmh.version>1.12</jmh.version>
<javac.target>1.6</javac.target>
<uberjar.name>benchmarks</uberjar.name>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<compilerVersion>${javac.target}</compilerVersion>
<source>${javac.target}</source>
<target>${javac.target}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.2</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<finalName>${uberjar.name}</finalName>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.openjdk.jmh.Main</mainClass>
</transformer>
</transformers>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>2.5</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.1</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
</plugin>
<plugin>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.9.1</version>
</plugin>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
</plugin>
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.3</version>
</plugin>
<plugin>
<artifactId>maven-source-plugin</artifactId>
<version>2.2.1</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.17</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
// Move this file to src/main/java in order to run with Maven
//
package org.sample;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Param;
//import org.openjdk.jmh.annotations.CompilerControl;
//import org.openjdk.jmh.annotations.CompilerControl.Mode;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
@State(Scope.Benchmark)
//@CompilerControl(Mode.EXCLUDE)
public class StringBenchmark {
private String from = "Alex";
private String to = "Readers";
private String subject = "Benchmarking with JMH";
@Param({"16"})
private int size;
@Benchmark
public String testEmptyBuffer() {
StringBuffer buffer = new StringBuffer();
return buffer.toString();
}
@Benchmark
public String testEmptyBuilder() {
StringBuilder builder = new StringBuilder();
return builder.toString();
}
@Benchmark
public String testEmptyLiteral() {
return "";
}
@Benchmark
public String testHelloWorldBuilder() {
StringBuilder builder = new StringBuilder();
builder.append("Hello");
builder.append("World");
return builder.toString();
}
@Benchmark
public String testHelloWorldBuffer() {
StringBuffer buffer = new StringBuffer();
buffer.append("Hello");
buffer.append("World");
return buffer.toString();
}
@Benchmark
public String testEmailBuilderSimple() {
StringBuilder builder = new StringBuilder(size);
builder.append("From");
builder.append(from);
builder.append("To");
builder.append(to);
builder.append("Subject");
builder.append(subject);
return builder.toString();
}
@Benchmark
public String testEmailBufferSimple() {
StringBuffer buffer = new StringBuffer(size);
buffer.append("From");
buffer.append(from);
buffer.append("To");
buffer.append(to);
buffer.append("Subject");
buffer.append(subject);
return buffer.toString();
}
@Benchmark
public String testEmailBuilderConcat() {
StringBuilder builder = new StringBuilder(size);
builder.append("From" + from);
builder.append("To" + to);
builder.append("Subject" + subject);
return builder.toString();
}
@Benchmark
public String testEmailBufferConcat() {
StringBuffer buffer = new StringBuffer(size);
buffer.append("From" + from);
buffer.append("To" + to);
buffer.append("Subject" + subject);
return buffer.toString();
}
@Benchmark
public String testEmailBuilderChain() {
return new StringBuilder(size).append("From").append(from).append("To").append(to).append("Subject")
.append(subject).toString();
}
@Benchmark
public String testEmailBufferChain() {
return new StringBuffer(size).append("From").append(from).append("To").append(to).append("Subject")
.append(subject).toString();
}
@Benchmark
public String testEmailLiteral() {
return "From" + from + "To" + to + "Subject" + subject;
}
}
Owner

alblue commented Jun 16, 2016

If you download this gist to test, you'll need to make a directory src/main/java and then move the source file in there in order to run it. The original blog post corresponding to this gist is at http://alblue.bandlem.com/2016/04/jmh-stringbuffer-stringbuilder.html

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