| /* |
| * Copyright (C) 2016 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. |
| */ |
| |
| package com.android.tools.build.apkzlib.zip; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.fail; |
| |
| import com.google.common.base.Stopwatch; |
| import java.text.DecimalFormat; |
| import java.util.Random; |
| import java.util.concurrent.TimeUnit; |
| import org.junit.Ignore; |
| import org.junit.Test; |
| |
| /** |
| * Tests for {@link FileUseMap}. |
| */ |
| public class FileUseMapTest { |
| |
| /** |
| * Verifies that as elements are added to the map, the performance of adding new elements |
| * is not significantly downgraded. This test creates a map and does several runs until |
| * a maximum is reached or a time limit is reached. |
| * |
| * <p>In each run, a random block is requested from the map with a random alignment and offset. |
| * The time for each run is saved. |
| * |
| * <p>After all runs are completed, the average time of the first runs (the head time) and |
| * the average time of the last runs (the tail time) is computed, as well as the average |
| * time. |
| * |
| * <p>The test passes if the average tail set time is (1) at most twice as long as the average |
| * and (2) is at most three times as long as the head set. This ensures that performance can |
| * degrade somewhat as the file map size increases, but not too much. |
| */ |
| @Test |
| @Ignore("This test relies on magic ratios to detect when performance is bad.") |
| public void addPerformanceTest() { |
| final long MAP_SIZE = 10000000; |
| final int MAX_RUNS = 10000; |
| final long MAX_TEST_DURATION_MS = 1000; |
| final int MAX_RANDOM_BLOCK_SIZE = 1000; |
| final int MAX_RANDOM_ALIGNMENT = 10; |
| final int HEAD_SET_SIZE = 1000; |
| final int TAIL_SET_SIZE = 1000; |
| final double MAX_TAIL_HEAD_RATIO = 3.0; |
| final double MAX_TAIL_TOTAL_RATIO = 2.0; |
| |
| long mapSize = MAP_SIZE; |
| FileUseMap map = new FileUseMap(mapSize, 0); |
| Random rand = new Random(0); |
| |
| long[] runs = new long[MAX_RUNS]; |
| int currentRun = 0; |
| |
| Stopwatch testStopwatch = Stopwatch.createStarted(); |
| while (testStopwatch.elapsed(TimeUnit.MILLISECONDS) < MAX_TEST_DURATION_MS |
| && currentRun < runs.length) { |
| Stopwatch runStopwatch = Stopwatch.createStarted(); |
| |
| long blockSize = 1 + rand.nextInt(MAX_RANDOM_BLOCK_SIZE); |
| long start = map.locateFree(blockSize, rand.nextInt(MAX_RANDOM_ALIGNMENT), |
| rand.nextInt(MAX_RANDOM_ALIGNMENT), FileUseMap.PositionAlgorithm.BEST_FIT); |
| long end = start + blockSize; |
| if (end >= mapSize) { |
| mapSize *= 2; |
| map.extend(mapSize); |
| } |
| |
| map.add(start, end, new Object()); |
| |
| runs[currentRun] = runStopwatch.elapsed(TimeUnit.NANOSECONDS); |
| currentRun++; |
| } |
| |
| double initialAvg = 0; |
| for (int i = 0; i < HEAD_SET_SIZE; i++) { |
| initialAvg += runs[i]; |
| } |
| |
| initialAvg /= HEAD_SET_SIZE; |
| |
| double endAvg = 0; |
| for (int i = currentRun - TAIL_SET_SIZE; i < currentRun; i++) { |
| endAvg += runs[i]; |
| } |
| |
| endAvg /= TAIL_SET_SIZE; |
| |
| double totalAvg = 0; |
| for (int i = 0; i < runs.length; i++) { |
| totalAvg += runs[i]; |
| } |
| |
| totalAvg /= currentRun; |
| |
| if (endAvg > totalAvg * MAX_TAIL_TOTAL_RATIO || endAvg > initialAvg * MAX_TAIL_HEAD_RATIO) { |
| DecimalFormat df = new DecimalFormat("#,###"); |
| |
| fail("Add performance at end is too bad. Performance in the beginning is " |
| + df.format(initialAvg) + "ns per insertion and at the end is " |
| + df.format(endAvg) + "ns. Average over the total of " + currentRun + " runs " |
| + "is " + df.format(totalAvg) + "ns."); |
| } |
| } |
| |
| @Test |
| public void testSizeComputation() { |
| FileUseMap m = new FileUseMap(200, 0); |
| |
| assertEquals(200, m.size()); |
| assertEquals(0, m.usedSize()); |
| |
| m.add(10, 20, new Object()); |
| assertEquals(200, m.size()); |
| assertEquals(20, m.usedSize()); |
| } |
| } |