Merge branch 'master' of https://github.com/JonCook/tutorials

jmh/README.md

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+## Java Microbenchmark Harness
+
+This module contains articles about the Java Microbenchmark Harness (JMH).
+
+### Relevant articles:
+
+- [Microbenchmarking with Java](https://www.baeldung.com/java-microbenchmark-harness)
+

jmh/pom.xml

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+<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/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung</groupId>
+    <artifactId>jmh</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>jmh</name>
+    <packaging>jar</packaging>
+    <url>http://maven.apache.org</url>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${openjdk.jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${openjdk.jmh.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>${maven-jar-plugin.version}</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <mainClass>com.baeldung.BenchmarkRunner</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <openjdk.jmh.version>1.19</openjdk.jmh.version>
+        <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
+    </properties>
+
+</project>

jmh/src/main/java/com/baeldung/BenchMark.java

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+package com.baeldung;
+
+import com.google.common.hash.HashFunction;
+import com.google.common.hash.Hasher;
+import com.google.common.hash.Hashing;
+import org.openjdk.jmh.annotations.*;
+
+import java.nio.charset.Charset;
+
+public class BenchMark {
+
+    @State(Scope.Benchmark)
+    public static class ExecutionPlan {
+
+        @Param({ "100", "200", "300", "500", "1000" })
+        public int iterations;
+
+        public Hasher murmur3;
+
+        public String password = "4v3rys3kur3p455w0rd";
+
+        @Setup(Level.Invocation)
+        public void setUp() {
+            murmur3 = Hashing.murmur3_128().newHasher();
+        }
+    }
+
+    @Fork(value = 1, warmups = 1)
+    @Benchmark
+    @BenchmarkMode(Mode.Throughput)
+    @Warmup(iterations = 5)
+    public void benchMurmur3_128(ExecutionPlan plan) {
+
+        for (int i = plan.iterations; i > 0; i--) {
+            plan.murmur3.putString(plan.password, Charset.defaultCharset());
+        }
+
+        plan.murmur3.hash();
+    }
+
+    @Benchmark
+    @Fork(value = 1, warmups = 1)
+    @BenchmarkMode(Mode.Throughput)
+    public void init() {
+        // Do nothing
+    }
+
+}

jmh/src/main/java/com/baeldung/BenchmarkRunner.java

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+package com.baeldung;
+
+public class BenchmarkRunner {
+
+    public static void main(String[] args) throws Exception {
+        org.openjdk.jmh.Main.main(args);
+    }
+
+}

jmh/src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>