Add micro-benchmark for comparing hash implementations

diff --git a/microbenchmark-template/src/main/java/org/sonar/microbenchmark/HashBenchmark.java b/microbenchmark-template/src/main/java/org/sonar/microbenchmark/HashBenchmark.java
new file mode 100644 (file)
index 0000000..d25aad3
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+++ b/microbenchmark-template/src/main/java/org/sonar/microbenchmark/HashBenchmark.java
@@ -0,0 +1,86 @@
+package org.sonar.microbenchmark;
+
+import net.jpountz.xxhash.XXHash32;
+import net.jpountz.xxhash.XXHash64;
+import net.jpountz.xxhash.XXHashFactory;
+import org.apache.commons.codec.digest.DigestUtils;
+import org.apache.commons.lang.StringUtils;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Measurement;
+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.Warmup;
+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;
+
+/**
+ *
+ * See https://code.google.com/p/xxhash/ and https://github.com/jpountz/lz4-java
+ *
+ */
+@OutputTimeUnit(TimeUnit.MILLISECONDS)
+@State(Scope.Thread)
+@Fork(1)
+@Warmup(iterations = 3)
+@Measurement(iterations = 3)
+@BenchmarkMode(Mode.Throughput)
+public class HashBenchmark {
+
+  @Param({"1", "100", "1000", "10000", "100000", "1000000"})
+  public int size;
+
+  XXHash32 xxHash32 = XXHashFactory.fastestInstance().hash32();
+  XXHash64 xxHash64 = XXHashFactory.fastestInstance().hash64();
+
+  byte[] bytes;
+
+  @Setup
+  public void setup() throws Exception {
+    bytes = StringUtils.repeat("3", size).getBytes();
+  }
+
+  @Benchmark
+  public String commonsCodecMd5() throws Exception {
+    return DigestUtils.md5Hex(bytes);
+  }
+
+  @Benchmark
+  public String commonsCodecSha1() throws Exception {
+    return DigestUtils.sha1Hex(bytes);
+  }
+
+  @Benchmark
+  public int xxhash32() throws Exception {
+    int seed = 0x9747b28c; // used to initialize the hash value, use whatever
+    // value you want, but always the same
+    return xxHash32.hash(bytes, 0, bytes.length, seed);
+  }
+
+  @Benchmark
+  public long xxhash64() throws Exception {
+    int seed = 0x9747b28c; // used to initialize the hash value, use whatever
+    // value you want, but always the same
+    return xxHash64.hash(bytes, 0, bytes.length, seed);
+  }
+
+  /**
+   * You can this benchmark with maven command-line (see run.sh) or by executing this method
+   * in IDE
+   */
+  public static void main(String[] args) throws RunnerException {
+    Options opt = new OptionsBuilder()
+      .include(HashBenchmark.class.getSimpleName())
+      .build();
+    new Runner(opt).run();
+  }
+}