1 files changed, 77 insertions, 0 deletions
diff --git a/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/SimpleLruCacheBenchmark.java b/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/SimpleLruCacheBenchmark.java
new file mode 100644
index 0000000000..caefd75d9b
--- /dev/null
+++ b/org.eclipse.jgit.benchmarks/src/org/eclipse/jgit/benchmarks/SimpleLruCacheBenchmark.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2019, Matthias Sohn <matthias.sohn@sap.com> and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Distribution License v. 1.0 which is available at
+ * https://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+package org.eclipse.jgit.benchmarks;
+
+import java.security.SecureRandom;
+import java.util.concurrent.TimeUnit;
+
+import org.eclipse.jgit.util.SimpleLruCache;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Group;
+import org.openjdk.jmh.annotations.GroupThreads;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+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;
+
+@State(Scope.Benchmark)
+public class SimpleLruCacheBenchmark {
+
+	SecureRandom rnd = new SecureRandom();
+
+	private volatile SimpleLruCache<String, String> cache = new SimpleLruCache<>(
+			100, 0.2f);
+
+	private volatile int i;
+
+	@Setup
+	public void setupBenchmark() {
+		i = rnd.nextInt(250);
+	}
+
+	@TearDown
+	public void teardown() {
+		cache = null;
+	}
+
+	@Benchmark
+	@Group("readwrite")
+	@GroupThreads(1)
+	@BenchmarkMode({ Mode.AverageTime })
+	@OutputTimeUnit(TimeUnit.NANOSECONDS)
+	public SimpleLruCache<String, String> testCacheWrite() {
+		cache.put("k" + i, "v" + i);
+		return cache;
+	}
+
+	@Benchmark
+	@Group("readwrite")
+	@GroupThreads(1)
+	@BenchmarkMode({ Mode.AverageTime })
+	@OutputTimeUnit(TimeUnit.NANOSECONDS)
+	public SimpleLruCache<String, String> testCacheRead() {
+		cache.get("k" + i);
+		return cache;
+	}
+
+	public static void main(String[] args) throws RunnerException {
+		Options opt = new OptionsBuilder()
+				.include(SimpleLruCacheBenchmark.class.getSimpleName())
+				.forks(1).jvmArgs("-ea").build();
+		new Runner(opt).run();
+	}
+}