Java UUID Benchmark

README.md

mvn clean package
java -jar target/benchmarks.jar -i 10 -f 1 -tu ms &> log.txt

later, use -t <thread_num> to run multiple times with different threads.

Note that during the test, JUG's time UUID might print some warnings:

WARNING: Timestamp over-run: need to reinitialize random sequence
WARNING: Timestamp over-run: need to reinitialize random sequence
WARNING: Timestamp over-run: need to reinitialize random sequence
WARNING: Need to wait for 1 milliseconds; virtual clock advanced too far in the future
WARNING: Timestamp over-run: need to reinitialize random sequence
WARNING: Timestamp over-run: need to reinitialize random sequence
WARNING: Need to wait for 1 milliseconds; virtual clock advanced too far in the future

Which indicates that the generation of time-based uuid is too fast that the generator tried to slow down.

MyBenchmark.java

package me.lotabout;

import com.fasterxml.uuid.Generators;
import com.fasterxml.uuid.impl.RandomBasedGenerator;
import com.fasterxml.uuid.impl.TimeBasedGenerator;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;

import java.util.Random;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

@BenchmarkMode({Mode.Throughput})
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@State(Scope.Benchmark)
@Warmup(iterations = 5)
public class MyBenchmark {

    private RandomBasedGenerator randomBasedGenerator;
    private RandomBasedGenerator jugRandomGenerator;
    private TimeBasedGenerator timeBasedGenerator;

    @Setup
    public void init() {
        randomBasedGenerator = Generators.randomBasedGenerator();
        timeBasedGenerator = Generators.timeBasedGenerator();
        jugRandomGenerator = Generators.randomBasedGenerator(new Random());
    }

    @Benchmark
    public void UUIDRandomUUID(Blackhole bh) {
        bh.consume(UUID.randomUUID());
    }

    @Benchmark
    public void jugWithRandom(Blackhole bh) {
        bh.consume(jugRandomGenerator.generate());
    }

    @Benchmark
    public void jugWithSecureRandom(Blackhole bh) {
        bh.consume(randomBasedGenerator.generate());
    }

    @Benchmark
    public void jugTime(Blackhole bh) {
        bh.consume(timeBasedGenerator.generate());
    }
}

pom.xml

<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>me.lotabout</groupId>
    <artifactId>uuidbench</artifactId>
    <version>1.0</version>
    <packaging>jar</packaging>

    <name>Auto-generated JMH benchmark</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>

        <dependency>
            <groupId>com.fasterxml.uuid</groupId>
            <artifactId>java-uuid-generator</artifactId>
            <version>3.1.3</version>
        </dependency>
    </dependencies>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <jmh.version>1.21</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>
                                    <!--
                                        Shading signed JARs will fail without this.
                                        http://stackoverflow.com/questions/999489/invalid-signature-file-when-attempting-to-run-a-jar
                                    -->
                                    <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>