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Diffstat (limited to 'benchmarks/ArrayIterationBenchmark.java')
-rw-r--r-- | benchmarks/ArrayIterationBenchmark.java | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/benchmarks/ArrayIterationBenchmark.java b/benchmarks/ArrayIterationBenchmark.java new file mode 100644 index 0000000..bdc255b --- /dev/null +++ b/benchmarks/ArrayIterationBenchmark.java @@ -0,0 +1,58 @@ +/* + * Copyright (C) 2010 Google Inc. + * + * 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 benchmarks; + +import com.google.caliper.Param; +import com.google.caliper.Runner; +import com.google.caliper.SimpleBenchmark; + +/** + * How do various ways of iterating through an array compare? + */ +public class ArrayIterationBenchmark extends SimpleBenchmark { + Foo[] mArray = new Foo[27]; + { + for (int i = 0; i < mArray.length; ++i) mArray[i] = new Foo(); + } + public void timeArrayIteration(int reps) { + for (int rep = 0; rep < reps; ++rep) { + int sum = 0; + for (int i = 0; i < mArray.length; i++) { + sum += mArray[i].mSplat; + } + } + } + public void timeArrayIterationCached(int reps) { + for (int rep = 0; rep < reps; ++rep) { + int sum = 0; + Foo[] localArray = mArray; + int len = localArray.length; + + for (int i = 0; i < len; i++) { + sum += localArray[i].mSplat; + } + } + } + public void timeArrayIterationForEach(int reps) { + for (int rep = 0; rep < reps; ++rep) { + int sum = 0; + for (Foo a: mArray) { + sum += a.mSplat; + } + } + } +} |