GH-44642: [Java] VariableWidthViewVectorBenchmarks

java/performance/src/main/java/org/apache/arrow/vector/VariableWidthVectorBenchmarks.java

@@ -23,8 +23,10 @@
 import org.apache.arrow.vector.holders.NullableVarCharHolder;
 import org.openjdk.jmh.annotations.Benchmark;
 import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Level;
 import org.openjdk.jmh.annotations.Mode;
 import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
 import org.openjdk.jmh.annotations.Scope;
 import org.openjdk.jmh.annotations.Setup;
 import org.openjdk.jmh.annotations.State;
@@ -52,8 +54,11 @@ public class VariableWidthVectorBenchmarks {
 
   private VarCharVector vector;
 
+  @Param({"1", "2", "10", "40"})
+  private int step;
+
   /** Setup benchmarks. */
-  @Setup
+  @Setup(Level.Iteration)
   public void prepare() {
     allocator = new RootAllocator(ALLOCATOR_CAPACITY);
     vector = new VarCharVector("vector", allocator);
@@ -63,7 +68,7 @@ public void prepare() {
   }
 
   /** Tear down benchmarks. */
-  @TearDown
+  @TearDown(Level.Iteration)
   public void tearDown() {
     arrowBuff.close();
     vector.close();
@@ -87,7 +92,7 @@ public int getValueCapacity() {
   @OutputTimeUnit(TimeUnit.MILLISECONDS)
   public int setSafeFromArray() {
     for (int i = 0; i < 500; ++i) {
-      vector.setSafe(i * 40, bytes);
+      vector.setSafe(i * step, bytes);
     }
     return vector.getBufferSize();
   }

java/performance/src/main/java/org/apache/arrow/vector/VariableWidthViewVectorBenchmarks.java

@@ -0,0 +1,130 @@
+/*
+ * 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.arrow.vector;
+
+import java.util.concurrent.TimeUnit;
+import org.apache.arrow.memory.ArrowBuf;
+import org.apache.arrow.memory.BufferAllocator;
+import org.apache.arrow.memory.RootAllocator;
+import org.apache.arrow.vector.holders.NullableViewVarCharHolder;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Level;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.TearDown;
+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;
+
+/** Benchmarks for {@link BaseVariableWidthVector}. */
+@State(Scope.Benchmark)
+public class VariableWidthViewVectorBenchmarks {
+  // checkstyle:off: MissingJavadocMethod
+
+  private static final int VECTOR_CAPACITY = 16 * 1024;
+
+  private static final int VECTOR_LENGTH = 1024;
+
+  private static final int ALLOCATOR_CAPACITY = 1024 * 1024;
+
+  private static byte[] bytes = VariableWidthVectorBenchmarks.class.getName().getBytes();
+  private ArrowBuf arrowBuff;
+
+  private BufferAllocator allocator;
+
+  private ViewVarCharVector vector;
+
+  @Param({"1", "2", "10", "40"})
+  private int step;
+
+  /** Setup benchmarks. */
+  @Setup(Level.Iteration)
+  public void prepare() {
+    allocator = new RootAllocator();
+    vector = new ViewVarCharVector("vector", allocator);
+    vector.allocateNew(VECTOR_CAPACITY, VECTOR_LENGTH);
+    arrowBuff = allocator.buffer(VECTOR_LENGTH);
+    arrowBuff.setBytes(0, bytes, 0, bytes.length);
+  }
+
+  /** Tear down benchmarks. */
+  @TearDown(Level.Iteration)
+  public void tearDown() {
+    arrowBuff.close();
+    vector.close();
+    allocator.close();
+  }
+
+  /**
+   * Test {@link BaseVariableWidthVector#getValueCapacity()}.
+   *
+   * @return useless. To avoid DCE by JIT.
+   */
+  @Benchmark
+  @BenchmarkMode(Mode.AverageTime)
+  @OutputTimeUnit(TimeUnit.NANOSECONDS)
+  public int getValueCapacity() {
+    return vector.getValueCapacity();
+  }
+
+  @Benchmark
+  @BenchmarkMode(Mode.AverageTime)
+  @OutputTimeUnit(TimeUnit.MILLISECONDS)
+  public int setSafeFromArray() {
+    for (int i = 0; i < 500; ++i) {
+      vector.setSafe(i * step, bytes);
+    }
+    return vector.getBufferSize();
+  }
+
+  @Benchmark
+  @BenchmarkMode(Mode.AverageTime)
+  @OutputTimeUnit(TimeUnit.MILLISECONDS)
+  public int setSafeFromNullableVarcharHolder() {
+    NullableViewVarCharHolder nvch = new NullableViewVarCharHolder();
+    nvch.buffer = arrowBuff;
+    nvch.start = 0;
+    nvch.end = bytes.length;
+    for (int i = 0; i < 50; ++i) {
+      nvch.isSet = 0;
+      for (int j = 0; j < 9; ++j) {
+        int idx = 10 * i + j;
+        vector.setSafe(idx, nvch);
+      }
+      nvch.isSet = 1;
+      vector.setSafe(10 * (i + 1), nvch);
+    }
+    return vector.getBufferSize();
+  }
+
+  public static void main(String[] args) throws RunnerException {
+    Options opt =
+        new OptionsBuilder()
+            .include(VariableWidthViewVectorBenchmarks.class.getSimpleName())
+            .forks(1)
+            .build();
+
+    new Runner(opt).run();
+  }
+  // checkstyle:on: MissingJavadocMethod
+}