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Java example source code file (StripedBenchmark.java)

This example Java source code file (StripedBenchmark.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

benchmark, eager, footprint, impl, lazy_large, list, lock_supplier, object, override, param, reentrantlock, striped, util, xms12g, xmx12g

The StripedBenchmark.java Java example source code

/*
 * Copyright (C) 2014 The Guava Authors
 *
 * Licensed 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 com.google.common.util.concurrent;

import static com.google.common.collect.Iterables.cycle;
import static com.google.common.collect.Iterables.limit;

import com.google.caliper.BeforeExperiment;
import com.google.caliper.Benchmark;
import com.google.caliper.Param;
import com.google.caliper.api.Footprint;
import com.google.caliper.api.VmOptions;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableList;
import com.google.common.primitives.Ints;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * A benchmark comparing the various striped implementations.
 */
@VmOptions({"-Xms12g", "-Xmx12g", "-d64"})
public class StripedBenchmark {
  private static final Supplier<Lock> LOCK_SUPPLIER = new Supplier() {
    @Override public Lock get() {
      return new ReentrantLock();
    }
  };

  @Param({"2", "8", "64", "1024", "65536"}) int numStripes;
  @Param Impl impl;

  enum Impl {
    EAGER {
      @Override Striped<Lock> get(int stripes) {
        return Striped.lock(stripes);
      }
    },
    LAZY_SMALL {
      @Override Striped<Lock> get(int stripes) {
        return new Striped.SmallLazyStriped<Lock>(stripes, LOCK_SUPPLIER);
      }
    },
    LAZY_LARGE {
      @Override Striped<Lock> get(int stripes) {
        return new Striped.LargeLazyStriped<Lock>(stripes, LOCK_SUPPLIER);
      }
    };

    abstract Striped<Lock> get(int stripes);
  }

  private Striped<Lock> striped;
  private int[] stripes;
  private List<Integer> bulkGetSet;

  @BeforeExperiment void setUp() {
    this.striped = impl.get(numStripes);
    stripes = new int[numStripes];
    for (int i = 0; i < numStripes; i++) {
      stripes[i] = i;
    }
    List<Integer> asList = Ints.asList(stripes);
    Collections.shuffle(asList, new Random(0xdeadbeef));

    // do bulk gets with exactly 10 keys (possibly <10 stripes) (or less if numStripes is smaller)
    bulkGetSet = ImmutableList.copyOf(limit(cycle(asList), 10));
  }

  @Footprint Object sizeOfStriped() {
    return impl.get(numStripes);
  }

  // a place to put the locks in sizeOfPopulatedStriped so they don't get GC'd before we measure
  final List<Lock> locks = new ArrayList(numStripes);

  @Footprint Object sizeOfPopulatedStriped() {
    locks.clear();
    Striped<Lock> striped = impl.get(numStripes);
    for (int i : stripes) {
      locks.add(striped.getAt(i));
    }
    return striped;
  }

  @Benchmark long timeConstruct(long reps) {
    long rvalue = 0;
    int numStripesLocal = numStripes;
    Impl implLocal = impl;
    for (long i = 0; i < reps; i++) {
      rvalue += implLocal.get(numStripesLocal).hashCode();
    }
    return rvalue;
  }

  @Benchmark long timeGetAt(long reps) {
    long rvalue = 0;
    int[] stripesLocal = stripes;
    int mask = numStripes - 1;
    Striped<Lock> stripedLocal = striped;
    for (long i = 0; i < reps; i++) {
      rvalue += stripedLocal.getAt(stripesLocal[(int) (i & mask)]).hashCode();
    }
    return rvalue;
  }

  @Benchmark long timeBulkGet(long reps) {
    long rvalue = 0;
    List<Integer> bulkGetSetLocal = bulkGetSet;
    Striped<Lock> stripedLocal = striped;
    for (long i = 0; i < reps; i++) {
      rvalue += stripedLocal.bulkGet(bulkGetSetLocal).hashCode();
    }
    return rvalue;
  }
}

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