1 /* 2 * Copyright (C) 2010 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect; 18 19 import static com.google.common.collect.DiscreteDomain.integers; 20 21 import com.google.caliper.BeforeExperiment; 22 import com.google.caliper.Benchmark; 23 import com.google.caliper.Param; 24 import java.util.Set; 25 26 /** 27 * Very simple powerSet iteration benchmark. 28 * 29 * @author Kevin Bourrillion 30 */ 31 public class PowerSetBenchmark { 32 @Param({"2", "4", "8", "16"}) 33 int elements; 34 35 Set<Set<Integer>> powerSet; 36 37 @BeforeExperiment setUp()38 void setUp() { 39 Set<Integer> set = ContiguousSet.create(Range.closed(1, elements), integers()); 40 powerSet = Sets.powerSet(set); 41 } 42 43 @Benchmark iteration(int reps)44 int iteration(int reps) { 45 int sum = 0; 46 for (int i = 0; i < reps; i++) { 47 for (Set<Integer> subset : powerSet) { 48 for (Integer value : subset) { 49 sum += value; 50 } 51 } 52 } 53 return sum; 54 } 55 } 56