ConeyLiu commented on a change in pull request #25470: [SPARK-28751][Core] 
Imporve java serializer deserialization performance
URL: https://github.com/apache/spark/pull/25470#discussion_r314566911
 
 

 ##########
 File path: 
core/src/test/scala/org/apache/spark/serializer/JavaSerializerBenchmark.scala
 ##########
 @@ -0,0 +1,94 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.serializer
+
+import java.nio.ByteBuffer
+
+import scala.reflect.ClassTag
+import scala.util.Random
+
+import org.apache.spark.SparkConf
+import org.apache.spark.benchmark.{Benchmark, BenchmarkBase}
+import org.apache.spark.internal.config._
+
+/**
+ * Benchmark for Java Serializer Deserialization use vs not use Class Resolve 
Cache.
+ * To run this benchmark:
+ * {{{
+ *   1. without sbt:
+ *      bin/spark-submit --class <this class> --jars <spark core test jar>
+ *   2. build/sbt "core/test:runMain <this class>"
+ *   3. generate result:
+ *      SPARK_GENERATE_BENCHMARK_FILES=1 build/sbt "core/test:runMain <this 
class>"
+ *      Results will be written to 
"benchmarks/JavaSerializerBenchmark-results.txt".
+ * }}}
+ */
+object JavaSerializerBenchmark extends BenchmarkBase {
+
+  val N = 100000
+  override def runBenchmarkSuite(mainArgs: Array[String]): Unit = {
+    val name = "Benchmark Java Serializer Deserialization use vs not use Class 
Resolve Cache"
+    runBenchmark(name) {
+      val benchmark = new Benchmark(name, N, 10, output = output)
+      Seq(true, false).foreach(useUnsafe => run(useUnsafe, benchmark))
+      benchmark.run()
+    }
+  }
+
+  private def run(useCache: Boolean, benchmark: Benchmark): Unit = {
+    def createCase[T: ClassTag](name: String, size: Int, gen: () => T): Unit = 
{
+      lazy val ser = createSerializer(useCache)
+      val data: Array[ByteBuffer] = Array.fill(size)(ser.serialize(gen()))
+
+      benchmark.addCase(s"$name with cache:$useCache") { _ =>
+        var i = 0
+        var s: ByteBuffer = null
+        while (i < size) {
+          s = data(i)
+          s.rewind()
+          ser.deserialize(s)
 
 Review comment:
   I'm not sure. This is what I saw from the profiling tool.

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