diff --git a/multithreading1/src/main/java/cn/bunny/jmh/JMHExample09.java b/multithreading1/src/main/java/cn/bunny/jmh/JMHExample09.java
new file mode 100644
index 0000000..6ca169c
--- /dev/null
+++ b/multithreading1/src/main/java/cn/bunny/jmh/JMHExample09.java
@@ -0,0 +1,45 @@
+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;
+
+@BenchmarkMode(Mode.AverageTime)
+@Fork(1)
+@Warmup(iterations = 5)
+@Measurement(iterations = 10)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@State(Scope.Thread)
+public class JMHExample09 {
+
+    public static void main(String[] args) throws RunnerException {
+        Options options = new OptionsBuilder()
+                .include(JMHExample09.class.getSimpleName())
+                .build();
+        new Runner(options).run();
+    }
+
+    @Benchmark
+    public void baseline() {
+    }
+
+    @Benchmark
+    public void measureLog1() {
+        double log = Math.log(Math.PI);
+    }
+
+    @Benchmark
+    public void measureLog2() {
+        double log = Math.log(Math.PI);
+        double logged = Math.log(log);
+    }
+
+    @Benchmark
+    public double measureLog3() {
+        return Math.log(Math.PI);
+    }
+}