feat: JMHExample04

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() {
+        }
+    }
+}