diff options
Diffstat (limited to 'benchmarks')
-rw-r--r-- | benchmarks/micro/ArrayAccess.java | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/benchmarks/micro/ArrayAccess.java b/benchmarks/micro/ArrayAccess.java new file mode 100644 index 0000000..c9413bc --- /dev/null +++ b/benchmarks/micro/ArrayAccess.java @@ -0,0 +1,79 @@ +/* + * Copyright (C) 2016 Linaro Limited. + * + * 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. + */ + +/* + * Description: Tracks performance of accessing array locations using variables and constants + * as indexes. + * Main Focus: Memory accesses using arrays. + * + */ + +package benchmarks.micro; + +public class ArrayAccess { + + private static final int ITER_COUNT = 1000; + + public static void AccessArrayConstants(int[] array) { + for (int j = 0; j < 100000; j++) { + array[4]++; + array[5]++; + } + } + + public static void AccessArrayVariables(int[] array, int i) { + for (int j = 0; j < 100000; j++) { + array[i]++; + array[i + 1]++; + array[i + 2]++; + array[i - 2]++; + array[i - 1]++; + } + } + + public void timeAccessArrayConstants(int iters) { + int[] array = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; + + for (int i = 0; i < iters; i++) { + AccessArrayConstants(array); + } + } + + public void timeAccessArrayVariables(int iters) { + int[] array = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; + + for (int i = 0; i < iters; i++) { + AccessArrayVariables(array, 5); + } + } + + public static void main(String[] args) { + int rc = 0; + ArrayAccess obj = new ArrayAccess(); + + long before = System.currentTimeMillis(); + obj.timeAccessArrayConstants(ITER_COUNT); + long after = System.currentTimeMillis(); + System.out.println("benchmarks/micro/ArrayAccessConstants: " + (after - before)); + + before = System.currentTimeMillis(); + obj.timeAccessArrayVariables(ITER_COUNT); + after = System.currentTimeMillis(); + System.out.println("benchmarks/micro/ArrayAccessVariables: " + (after - before)); + + System.exit(rc); + } +} |