feat: JMHExample13

multithreading1/src/main/java/cn/bunny/jmh/JMHExample13.java

@@ -0,0 +1,47 @@
+package cn.bunny.jmh;
+
+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;
+import java.util.concurrent.atomic.AtomicInteger;
+
+@BenchmarkMode(Mode.AverageTime)
+@Fork(1)
+@Warmup(iterations = 5)
+@Measurement(iterations = 5)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@State(Scope.Group)
+public class JMHExample13 {
+
+    private AtomicInteger counter;
+
+    public static void main(String[] args) throws RunnerException {
+        final Options options = new OptionsBuilder()
+                .include(JMHExample13.class.getSimpleName())
+                .build();
+        new Runner(options).run();
+    }
+
+    @Setup
+    public void setup() {
+        this.counter = new AtomicInteger();
+    }
+
+    @GroupThreads(5)
+    @Group("q")
+    @Benchmark
+    public void inc() {
+        this.counter.incrementAndGet();
+    }
+
+    @GroupThreads(5)
+    @Group("q")
+    @Benchmark
+    public int get() {
+        return this.counter.get();
+    }
+}