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 25 import java.util.Set; 26 27 /** 28 * Very simple powerSet iteration benchmark. 29 * 30 * @author Kevin Bourrillion 31 */ 32 public class PowerSetBenchmark { 33 @Param({"2", "4", "8", "16"}) int elements; 34 35 Set<Set<Integer>> powerSet; 36 setUp()37 @BeforeExperiment void setUp() { 38 Set<Integer> set = ContiguousSet.create(Range.closed(1, elements), integers()); 39 powerSet = Sets.powerSet(set); 40 } 41 iteration(int reps)42 @Benchmark int iteration(int reps) { 43 int sum = 0; 44 for (int i = 0; i < reps; i++) { 45 for (Set<Integer> subset : powerSet) { 46 for (Integer value : subset) { 47 sum += value; 48 } 49 } 50 } 51 return sum; 52 } 53 } 54