| /******************************************************************************* |
| * Copyright (c) 1998, 2012 Oracle and/or its affiliates. All rights reserved. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 |
| * which accompanies this distribution. |
| * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html |
| * and the Eclipse Distribution License is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * Contributors: |
| * Oracle - initial impl |
| ******************************************************************************/ |
| package example; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Generic performance test. |
| * This allows executing a timed run and measures and logs the performance. |
| * Logs the executions per run (minute), logs average and % stdev. |
| */ |
| public class PerformanceTest { |
| |
| public static int REPEATS = 5; |
| public static int RUN_TIME = 10000; //10 seconds. |
| |
| /** |
| * Measure the performance of the run. |
| * Repeat the run REPEATS (5) times, |
| * and measure the number of execution in RUN_TIME (60s). |
| */ |
| public static PerformanceResult executeRun(String name, Runnable runnable) { |
| System.out.println("Starting run: " + name); |
| |
| List<Integer> results = new ArrayList<Integer>(); |
| // Repeat the test and baseline for the number of repeats. |
| for (int index = 0; index < REPEATS; index++) { |
| long startTime, endTime; |
| int executions = 0; |
| System.gc(); |
| try { |
| Thread.sleep(1000); |
| } catch (InterruptedException ignore) {} |
| startTime = System.currentTimeMillis(); |
| endTime = startTime; |
| // Count how many times the test can be invoked in the run time. |
| // This allows for the test run time to be easily changed. |
| while ((startTime + RUN_TIME) >= endTime) { |
| runnable.run(); |
| executions++; |
| endTime = System.currentTimeMillis(); |
| } |
| results.add(executions); |
| System.out.println("Done run: " + index + " for: " + name); |
| } |
| |
| System.out.println("Completed run: " + name); |
| |
| PerformanceResult result = new PerformanceResult(); |
| result.testName = name; |
| result.runRepeats = REPEATS; |
| result.runTime = RUN_TIME; |
| result.average = averageResults(results); |
| result.max = maxResults(results); |
| result.min = minResults(results); |
| result.standardDeviation = standardDeviationResults(results); |
| |
| System.out.println(""); |
| System.out.println(result); |
| System.out.println(""); |
| System.out.println(""); |
| |
| return result; |
| } |
| |
| /** |
| * Compute the max of the results. |
| */ |
| public static int maxResults(List<Integer> times) { |
| int testMax = 0; |
| for (int index = 0; index < times.size(); index++) { |
| int time = (int)times.get(index); |
| if (time > testMax) { |
| testMax = time; |
| } |
| } |
| return testMax; |
| } |
| |
| /** |
| * Compute the min of the results. |
| */ |
| public static int minResults(List<Integer> times) { |
| int testMin = 0; |
| for (int index = 0; index < times.size(); index++) { |
| int time = (int)times.get(index); |
| if ((testMin == 0) || (time < testMin)) { |
| testMin = time; |
| } |
| } |
| return testMin; |
| } |
| |
| /** |
| * Filter max and min from results. |
| */ |
| public static List<Integer> filterMaxMinResults(List<Integer> times) { |
| List filteredTimes = new ArrayList(times); |
| if (filteredTimes.size() > 3) { |
| filteredTimes.remove((Integer)maxResults(times)); |
| filteredTimes.remove((Integer)minResults(times)); |
| } |
| return filteredTimes; |
| } |
| |
| /** |
| * Compute the average of the results rejecting the min and max. |
| */ |
| public static double averageResults(List<Integer> allTimes) { |
| // Compute the average reject the min and max to improve consistency. |
| List<Integer> times = filterMaxMinResults(allTimes); |
| double testAverage = 0; |
| for (int index = 0; index < times.size(); index++) { |
| int time = (int)times.get(index); |
| testAverage = testAverage + time; |
| } |
| testAverage = testAverage / times.size(); |
| return testAverage; |
| } |
| |
| /** |
| * Compute the standard deviation of the results rejecting the min and max. |
| */ |
| public static double standardDeviationResults(List<Integer> allTimes) { |
| // Compute the average reject the min and max to improve consistency. |
| double testAverage = averageResults(allTimes); |
| |
| // Compute the standard deviation reject the min and max to improve consistency. |
| List<Integer> times = filterMaxMinResults(allTimes); |
| double testStandardDeviation = 0; |
| for (int index = 0; index < times.size(); index++) { |
| int time = (int)times.get(index); |
| testStandardDeviation = testStandardDeviation + Math.pow(time - testAverage, 2); |
| } |
| testStandardDeviation = testStandardDeviation / times.size(); |
| testStandardDeviation = Math.sqrt(testStandardDeviation); |
| // As percent of average |
| testStandardDeviation = (testStandardDeviation / testAverage) * 100; |
| return testStandardDeviation; |
| } |
| } |