feat: JMHExample06

multithreading1/src/main/java/cn/bunny/JMHExample04.java

@@ -0,0 +1,40 @@
+package cn.bunny;
+
+import org.openjdk.jmh.annotations.*;
+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.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@Fork(1)
+@Warmup(iterations = 10)
+@Measurement(iterations = 10)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@Threads(5)
+public class JMHExample04 {
+    public static void main(String[] args) throws RunnerException {
+        Options options = new OptionsBuilder()
+                .include(JMHExample04.class.getSimpleName())
+                .build();
+        new Runner(options).run();
+    }
+
+    @Benchmark
+    public void test(Test test) {
+        test.method();
+    }
+
+    // Test实例会被多个线程共享，只有一份Test
+    @State(Scope.Benchmark)
+    public static class Test {
+        public Test() {
+            System.out.println("create instance");
+        }
+
+        public void method() {
+        }
+    }
+}

multithreading1/src/main/java/cn/bunny/JMHExample05.java

@@ -0,0 +1,56 @@
+package cn.bunny;
+
+import org.openjdk.jmh.annotations.*;
+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.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@Fork(1)
+@Warmup(iterations = 5)
+@Measurement(iterations = 10)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+public class JMHExample05 {
+
+    public static void main(String[] args) throws RunnerException {
+        Options options = new OptionsBuilder()
+                .include(JMHExample05.class.getSimpleName())
+                .build();
+
+        new Runner(options).run();
+    }
+
+    // 在线程组test，在线称中有三个线程不断对Test实例write方法进行调用
+    @GroupThreads(3)
+    @Group("test")
+    @Benchmark
+    public void testWrite(MyState state) {
+        state.write();
+    }
+
+    // 在线程组test，在线程中有三个线程对testRead方法进行调用
+    @GroupThreads(3)
+    @Group("test")
+    @Benchmark
+    public void testRead(MyState state) {
+        state.read();
+    }
+
+    @State(Scope.Benchmark)
+    public static class MyState {
+        public MyState() {
+            System.out.println("create instance");
+        }
+
+        public void write() {
+            System.out.println("write");
+        }
+
+        public void read() {
+            System.out.println("read");
+        }
+    }
+}

multithreading1/src/main/java/cn/bunny/JMHExample06.java

@@ -0,0 +1,50 @@
+package cn.bunny;
+
+import org.openjdk.jmh.annotations.*;
+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.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@Fork(1)
+@Warmup(iterations = 5)
+@Measurement(iterations = 10)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@Threads(5)
+@State(Scope.Benchmark)
+public class JMHExample06 {
+
+    private Map<Long, Long> concurrentMap;
+    private Map<Long, Long> synchronizedMap;
+
+    public static void main(String[] args) throws RunnerException {
+        Options options = new OptionsBuilder()
+                .include(JMHExample06.class.getSimpleName())
+                .build();
+
+        new Runner(options).run();
+    }
+
+    @Setup
+    public void setUp() {
+        concurrentMap = new ConcurrentHashMap<>();
+        synchronizedMap = Collections.synchronizedMap(new HashMap<>());
+    }
+
+    @Benchmark
+    public void testConcurrencyMap() {
+        concurrentMap.put(System.nanoTime(), System.nanoTime());
+    }
+
+    @Benchmark
+    public void testSynchronizedMap() {
+        synchronizedMap.put(System.nanoTime(), System.nanoTime());
+    }
+}