JMH benchmark for buffered checksum

Author: sgup432

lucene/benchmark-jmh/src/java/org/apache/lucene/benchmark/jmh/BufferedChecksumBenchmark.java

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+/*
+ * 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.lucene.benchmark.jmh;
+
+import java.util.concurrent.TimeUnit;
+import java.util.zip.CRC32;
+import java.util.zip.CRC32C;
+import org.apache.lucene.store.BufferedChecksum;
+import org.openjdk.jmh.annotations.*;
+
+@BenchmarkMode(Mode.Throughput)
+@OutputTimeUnit(TimeUnit.SECONDS)
+@State(Scope.Benchmark)
+@Warmup(iterations = 5, time = 5)
+@Measurement(iterations = 5, time = 5)
+@Fork(1)
+public class BufferedChecksumBenchmark {
+
+  @Param({"1024", "8192", "65536"})
+  private int dataSize;
+
+  @Param({"1024", "2048", "4096"})
+  private int bufferSize;
+
+  private byte[] data;
+
+  @Setup
+  public void setup() {
+    data = new byte[dataSize];
+    for (int i = 0; i < dataSize; i++) {
+      data[i] = (byte) i;
+    }
+  }
+
+  @Benchmark
+  public long bufferedCRC32SmallUpdates() {
+    BufferedChecksum checksum = new BufferedChecksum(new CRC32(), bufferSize);
+    for (int i = 0; i < data.length; i++) {
+      checksum.update(data[i]); // Single byte updates
+    }
+    return checksum.getValue();
+  }
+
+  @Benchmark
+  public long bufferedCRC32BulkUpdate() {
+    BufferedChecksum checksum = new BufferedChecksum(new CRC32(), bufferSize);
+    checksum.update(data, 0, data.length);
+    return checksum.getValue();
+  }
+
+  // CRC32C benchmarks
+  @Benchmark
+  public long bufferedCRC32CSmallUpdates() {
+    BufferedChecksum checksum = new BufferedChecksum(new CRC32C(), bufferSize);
+    for (int i = 0; i < data.length; i++) {
+      checksum.update(data[i]);
+    }
+    return checksum.getValue();
+  }
+
+  @Benchmark
+  public long bufferedCRC32CBulkUpdate() {
+    BufferedChecksum checksum = new BufferedChecksum(new CRC32C(), bufferSize);
+    checksum.update(data, 0, data.length);
+    return checksum.getValue();
+  }
+}