add benchmark

benchmark/src/main/java/com/alibaba/fastjson2/benchmark/fastcode/DateToString.java

@@ -0,0 +1,32 @@
+package com.alibaba.fastjson2.benchmark.fastcode;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.infra.Blackhole;
+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.Date;
+import java.util.concurrent.TimeUnit;
+
+public class DateToString {
+    static final Date date = new Date(1693836447048L);
+
+    @Benchmark
+    public void dateToString(Blackhole bh) throws Throwable {
+        bh.consume(date.toString());
+    }
+
+    public static void main(String[] args) throws RunnerException {
+        Options options = new OptionsBuilder()
+                .include(DateToString.class.getName())
+                .mode(Mode.Throughput)
+                .timeUnit(TimeUnit.MILLISECONDS)
+                .warmupIterations(1)
+                .forks(1)
+                .build();
+        new Runner(options).run();
+    }
+}

benchmark/src/test/java/com/alibaba/fastjson2/benchmark/fastcode/DateToStringTest.java

@@ -0,0 +1,29 @@
+package com.alibaba.fastjson2.benchmark.fastcode;
+
+import org.openjdk.jmh.infra.Blackhole;
+
+public class DateToStringTest {
+    static final Blackhole BH = new Blackhole("Today's password is swordfish. I understand instantiating Blackholes directly is dangerous.");
+    static final DateToString benchmark = new DateToString();
+    static final int COUNT = 100_000_000;
+
+    public static void dateToString() throws Throwable {
+        for (int j = 0; j < 5; j++) {
+            long start = System.currentTimeMillis();
+            for (int i = 0; i < COUNT; ++i) {
+                benchmark.dateToString(BH);
+            }
+            long millis = System.currentTimeMillis() - start;
+            System.out.println("DateToString-dateToString millis : " + millis);
+            // zulu8.58.0.13 :
+            // zulu11.52.13 :
+            // zulu17.38.21 :
+            // jdk22-ea : 2495
+            // jdk22-baseline : 5669
+        }
+    }
+
+    public static void main(String[] args) throws Throwable {
+        dateToString();
+    }
+}

test-jdk17/src/test/java/com/alibaba/fastjson2/fastcode/DateTest.java

@@ -0,0 +1,15 @@
+package com.alibaba.fastjson2.fastcode;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Date;
+
+public class DateTest {
+    @Test
+    public void test() {
+        Date date = new Date();
+        String str = date.toString();
+        char[] chars = str.toCharArray();
+        System.out.println(str);
+    }
+}