| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| public class Main { |
| public Main() {} |
| |
| // Measure adds the first and last element of the array by using ScopedPrimitiveArray. |
| static native long measureByteArray(long reps, byte[] arr); |
| static native long measureShortArray(long reps, short[] arr); |
| static native long measureIntArray(long reps, int[] arr); |
| static native long measureLongArray(long reps, long[] arr); |
| |
| static void checkEq(long expected, long value) { |
| if (expected != value) { |
| System.out.println("error: Expected " + expected + " but got " + value); |
| } |
| } |
| |
| static void runPerfTest(long reps) { |
| for (int length = 1; length <= 8192; length *= 8) { |
| byte[] bytes = new byte[length]; |
| bytes[0] = 1; |
| bytes[length - 1] = 2; |
| short[] shorts = new short[length]; |
| shorts[0] = 1; |
| shorts[length - 1] = 2; |
| int[] ints = new int[length]; |
| ints[0] = 1; |
| ints[length - 1] = 2; |
| long[] longs = new long[length]; |
| longs[0] = 1; |
| longs[length - 1] = 2; |
| long value = 0; |
| long elapsed = 0; |
| long start = 0; |
| |
| start = System.nanoTime(); |
| value = measureByteArray(reps, bytes); |
| elapsed = System.nanoTime() - start; |
| System.out.println("Byte length=" + length + " ns/op=" + (double) elapsed / reps); |
| checkEq(value, reps * (long) (bytes[0] + bytes[length - 1])); |
| |
| start = System.nanoTime(); |
| value = measureShortArray(reps, shorts); |
| elapsed = System.nanoTime() - start; |
| System.out.println("Short length=" + length + " ns/op=" + (double) elapsed / reps); |
| checkEq(value, reps * (long) (shorts[0] + shorts[length - 1])); |
| |
| start = System.nanoTime(); |
| value = measureIntArray(reps, ints); |
| elapsed = System.nanoTime() - start; |
| System.out.println("Int length=" + length + " ns/op=" + (double) elapsed / reps); |
| checkEq(value, reps * (ints[0] + ints[length - 1])); |
| |
| start = System.nanoTime(); |
| value = measureLongArray(reps, longs); |
| elapsed = System.nanoTime() - start; |
| System.out.println("Long length=" + length + " ns/op=" + (double) elapsed / reps); |
| checkEq(value, reps * (longs[0] + longs[length - 1])); |
| } |
| } |
| |
| public static void main(String[] args) { |
| System.loadLibrary(args[0]); |
| long iterations = 2000000; |
| if (args.length > 1) { |
| iterations = Long.parseLong(args[1], 10); |
| } |
| runPerfTest(iterations); |
| System.out.println("Done"); |
| } |
| } |