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Java example source code file (TestSummarizeRSetStatsTools.java)

This example Java source code file (TestSummarizeRSetStatsTools.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, exception, expected, free, humonguous, incorrect, management, object, old, outputanalyzer, regex, rset, string, useg1gc, util, xmn4m, young

The TestSummarizeRSetStatsTools.java Java example source code

/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * Common helpers for TestSummarizeRSetStats* tests
 */

import sun.management.ManagementFactoryHelper;
import com.sun.management.HotSpotDiagnosticMXBean;
import com.sun.management.VMOption;

import com.oracle.java.testlibrary.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.lang.Thread;
import java.util.ArrayList;
import java.util.Arrays;

class VerifySummaryOutput {
    // 4M size, both are directly allocated into the old gen
    static Object[] largeObject1 = new Object[1024 * 1024];
    static Object[] largeObject2 = new Object[1024 * 1024];

    static int[] temp;

    public static void main(String[] args) {
        // create some cross-references between these objects
        for (int i = 0; i < largeObject1.length; i++) {
            largeObject1[i] = largeObject2;
        }

        for (int i = 0; i < largeObject2.length; i++) {
            largeObject2[i] = largeObject1;
        }

        int numGCs = Integer.parseInt(args[0]);

        if (numGCs > 0) {
            // try to force a minor collection: the young gen is 4M, the
            // amount of data allocated below is roughly that (4*1024*1024 +
            // some header data)
            for (int i = 0; i < 1024 ; i++) {
                temp = new int[1024];
            }
        }

        for (int i = 0; i < numGCs - 1; i++) {
            System.gc();
        }
    }
}

public class TestSummarizeRSetStatsTools {

    // the VM is currently run using G1GC, i.e. trying to test G1 functionality.
    public static boolean testingG1GC() {
        HotSpotDiagnosticMXBean diagnostic = ManagementFactoryHelper.getDiagnosticMXBean();

        VMOption option = diagnostic.getVMOption("UseG1GC");
        if (option.getValue().equals("false")) {
          System.out.println("Skipping this test. It is only a G1 test.");
          return false;
        }
        return true;
    }

    public static String runTest(String[] additionalArgs, int numGCs) throws Exception {
        ArrayList<String> finalargs = new ArrayList();
        String[] defaultArgs = new String[] {
            "-XX:+UseG1GC",
            "-XX:+UseCompressedOops",
            "-Xmn4m",
            "-Xmx20m",
            "-XX:InitiatingHeapOccupancyPercent=100", // we don't want the additional GCs due to initial marking
            "-XX:+PrintGC",
            "-XX:+UnlockDiagnosticVMOptions",
            "-XX:G1HeapRegionSize=1M",
        };

        finalargs.addAll(Arrays.asList(defaultArgs));

        if (additionalArgs != null) {
            finalargs.addAll(Arrays.asList(additionalArgs));
        }

        finalargs.add(VerifySummaryOutput.class.getName());
        finalargs.add(String.valueOf(numGCs));

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
            finalargs.toArray(new String[0]));
        OutputAnalyzer output = new OutputAnalyzer(pb.start());

        output.shouldHaveExitValue(0);

        String result = output.getStdout();
        return result;
    }

    private static void checkCounts(int expected, int actual, String which) throws Exception {
        if (expected != actual) {
            throw new Exception("RSet summaries mention " + which + " regions an incorrect number of times. Expected " + expected + ", got " + actual);
        }
    }

    public static void expectPerRegionRSetSummaries(String result, int expectedCumulative, int expectedPeriodic) throws Exception {
        expectRSetSummaries(result, expectedCumulative, expectedPeriodic);
        int actualYoung = result.split("Young regions").length - 1;
        int actualHumonguous = result.split("Humonguous regions").length - 1;
        int actualFree = result.split("Free regions").length - 1;
        int actualOther = result.split("Old regions").length - 1;

        // the strings we check for above are printed four times per summary
        int expectedPerRegionTypeInfo = (expectedCumulative + expectedPeriodic) * 4;

        checkCounts(expectedPerRegionTypeInfo, actualYoung, "Young");
        checkCounts(expectedPerRegionTypeInfo, actualHumonguous, "Humonguous");
        checkCounts(expectedPerRegionTypeInfo, actualFree, "Free");
        checkCounts(expectedPerRegionTypeInfo, actualOther, "Old");
    }

    public static void expectRSetSummaries(String result, int expectedCumulative, int expectedPeriodic) throws Exception {
        int actualTotal = result.split("concurrent refinement").length - 1;
        int actualCumulative = result.split("Cumulative RS summary").length - 1;

        if (expectedCumulative != actualCumulative) {
            throw new Exception("Incorrect amount of RSet summaries at the end. Expected " + expectedCumulative + ", got " + actualCumulative);
        }

        if (expectedPeriodic != (actualTotal - actualCumulative)) {
            throw new Exception("Incorrect amount of per-period RSet summaries at the end. Expected " + expectedPeriodic + ", got " + (actualTotal - actualCumulative));
        }
    }
}

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