jdk8-mips64-public/hotspot: test/gc/g1/TestShrinkAuxiliaryData.java@6cbff0651f1a

     1 /*

     2  * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    24 import com.oracle.java.testlibrary.Asserts;

    25 import com.oracle.java.testlibrary.OutputAnalyzer;

    26 import com.oracle.java.testlibrary.Platform;

    27 import com.oracle.java.testlibrary.ProcessTools;

    28 import com.oracle.java.testlibrary.Utils;

    29 import java.io.IOException;

    30 import java.lang.management.ManagementFactory;

    31 import java.lang.management.MemoryUsage;

    32 import java.text.DecimalFormat;

    33 import java.text.DecimalFormatSymbols;

    34 import java.util.ArrayList;

    35 import java.util.Arrays;

    36 import java.util.Collections;

    37 import java.util.LinkedList;

    38 import java.util.List;

    39 import sun.misc.Unsafe; // for ADDRESS_SIZE

    40 import sun.hotspot.WhiteBox;

    42 public class TestShrinkAuxiliaryData {

    44     private static final int REGION_SIZE = 1024 * 1024;

    46     private final static String[] initialOpts = new String[]{

    47         "-XX:MinHeapFreeRatio=10",

    48         "-XX:MaxHeapFreeRatio=11",

    49         "-XX:+UseG1GC",

    50         "-XX:G1HeapRegionSize=" + REGION_SIZE,

    51         "-XX:-ExplicitGCInvokesConcurrent",

    52         "-XX:+PrintGCDetails",

    53         "-XX:+UnlockDiagnosticVMOptions",

    54         "-XX:+WhiteBoxAPI",

    55         "-Xbootclasspath/a:.",

    56     };

    58     private final int hotCardTableSize;

    60     protected TestShrinkAuxiliaryData(int hotCardTableSize) {

    61         this.hotCardTableSize = hotCardTableSize;

    62     }

    64     protected void test() throws Exception {

    65         ArrayList<String> vmOpts = new ArrayList();

    66         Collections.addAll(vmOpts, initialOpts);

    68         int maxCacheSize = Math.max(0, Math.min(31, getMaxCacheSize()));

    69         if (maxCacheSize < hotCardTableSize) {

    70             System.out.format("Skiping test for %d cache size due max cache size %d",

    71                     hotCardTableSize, maxCacheSize

    72             );

    73             return;

    74         }

    76         printTestInfo(maxCacheSize);

    78         vmOpts.add("-XX:G1ConcRSLogCacheSize=" + hotCardTableSize);

    79         vmOpts.addAll(Arrays.asList(Utils.getTestJavaOpts()));

    81         // for 32 bits ObjectAlignmentInBytes is not a option

    82         if (Platform.is32bit()) {

    83             ArrayList<String> vmOptsWithoutAlign = new ArrayList(vmOpts);

    84             vmOptsWithoutAlign.add(ShrinkAuxiliaryDataTest.class.getName());

    85             performTest(vmOptsWithoutAlign);

    86             return;

    87         }

    89         for (int alignment = 3; alignment <= 8; alignment++) {

    90             ArrayList<String> vmOptsWithAlign = new ArrayList(vmOpts);

    91             vmOptsWithAlign.add("-XX:ObjectAlignmentInBytes="

    92                     + (int) Math.pow(2, alignment));

    93             vmOptsWithAlign.add(ShrinkAuxiliaryDataTest.class.getName());

    95             performTest(vmOptsWithAlign);

    96         }

    97     }

    99     private void performTest(List<String> opts) throws Exception {

   100         ProcessBuilder pb

   101                 = ProcessTools.createJavaProcessBuilder(

   102                         opts.toArray(new String[opts.size()])

   103                 );

   105         OutputAnalyzer output = new OutputAnalyzer(pb.start());

   106         System.out.println(output.getStdout());

   107         System.err.println(output.getStderr());

   108         output.shouldHaveExitValue(0);

   109     }

   111     private void printTestInfo(int maxCacheSize) {

   113         DecimalFormat grouped = new DecimalFormat("000,000");

   114         DecimalFormatSymbols formatSymbols = grouped.getDecimalFormatSymbols();

   115         formatSymbols.setGroupingSeparator(' ');

   116         grouped.setDecimalFormatSymbols(formatSymbols);

   118         System.out.format(

   119                 "Test will use %s bytes of memory of %s available%n"

   120                 + "Available memory is %s with %d bytes pointer size - can save %s pointers%n"

   121                 + "Max cache size: 2^%d = %s elements%n",

   122                 grouped.format(ShrinkAuxiliaryDataTest.getMemoryUsedByTest()),

   123                 grouped.format(Runtime.getRuntime().maxMemory()),

   124                 grouped.format(Runtime.getRuntime().maxMemory()

   125                         - ShrinkAuxiliaryDataTest.getMemoryUsedByTest()),

   126                 Unsafe.ADDRESS_SIZE,

   127                 grouped.format((Runtime.getRuntime().freeMemory()

   128                         - ShrinkAuxiliaryDataTest.getMemoryUsedByTest())

   129                         / Unsafe.ADDRESS_SIZE),

   130                 maxCacheSize,

   131                 grouped.format((int) Math.pow(2, maxCacheSize))

   132         );

   133     }

   135     /**

   136      * Detects maximum possible size of G1ConcRSLogCacheSize available for

   137      * current process based on maximum available process memory size

   138      *

   139      * @return power of two

   140      */

   141     private static int getMaxCacheSize() {

   142         long availableMemory = Runtime.getRuntime().freeMemory()

   143                 - ShrinkAuxiliaryDataTest.getMemoryUsedByTest() - 1l;

   144         if (availableMemory <= 0) {

   145             return 0;

   146         }

   148         long availablePointersCount = availableMemory / Unsafe.ADDRESS_SIZE;

   149         return (63 - (int) Long.numberOfLeadingZeros(availablePointersCount));

   150     }

   152     static class ShrinkAuxiliaryDataTest {

   154         public static void main(String[] args) throws IOException {

   156             ShrinkAuxiliaryDataTest testCase = new ShrinkAuxiliaryDataTest();

   158             if (!testCase.checkEnvApplicability()) {

   159                 return;

   160             }

   162             testCase.test();

   163         }

   165         /**

   166          * Checks is this environment suitable to run this test

   167          * - memory is enough to decommit (page size is not big)

   168          * - RSet cache size is not too big

   169          *

   170          * @return true if test could run, false if test should be skipped

   171          */

   172         protected boolean checkEnvApplicability() {

   174             int pageSize = WhiteBox.getWhiteBox().getVMPageSize();

   175             System.out.println( "Page size = " + pageSize

   176                     + " region size = " + REGION_SIZE

   177                     + " aux data ~= " + (REGION_SIZE * 3 / 100));

   178             // If auxdata size will be less than page size it wouldn't decommit.

   179             // Auxiliary data size is about ~3.6% of heap size.

   180             if (pageSize >= REGION_SIZE * 3 / 100) {

   181                 System.out.format("Skipping test for too large page size = %d",

   182                        pageSize

   183                 );

   184                 return false;

   185             }

   187             if (REGION_SIZE * REGIONS_TO_ALLOCATE > Runtime.getRuntime().maxMemory()) {

   188                 System.out.format("Skipping test for too low available memory. "

   189                         + "Need %d, available %d",

   190                         REGION_SIZE * REGIONS_TO_ALLOCATE,

   191                         Runtime.getRuntime().maxMemory()

   192                 );

   193                 return false;

   194             }

   196             return true;

   197         }

   199         class GarbageObject {

   201             private final List<byte[]> payload = new ArrayList();

   202             private final List<GarbageObject> ref = new LinkedList();

   204             public GarbageObject(int size) {

   205                 payload.add(new byte[size]);

   206             }

   208             public void addRef(GarbageObject g) {

   209                 ref.add(g);

   210             }

   212             public void mutate() {

   213                 if (!payload.isEmpty() && payload.get(0).length > 0) {

   214                     payload.get(0)[0] = (byte) (Math.random() * Byte.MAX_VALUE);

   215                 }

   216             }

   217         }

   219         private final List<GarbageObject> garbage = new ArrayList();

   221         public void test() throws IOException {

   223             MemoryUsage muFull, muFree, muAuxDataFull, muAuxDataFree;

   224             float auxFull, auxFree;

   226             allocate();

   227             link();

   228             mutate();

   230             muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();

   231             long numUsedRegions = WhiteBox.getWhiteBox().g1NumMaxRegions()

   232                     - WhiteBox.getWhiteBox().g1NumFreeRegions();

   233             muAuxDataFull = WhiteBox.getWhiteBox().g1AuxiliaryMemoryUsage();

   234             auxFull = (float)muAuxDataFull.getUsed() / numUsedRegions;

   236             System.out.format("Full aux data  ratio= %f, regions max= %d, used= %d\n",

   237                     auxFull, WhiteBox.getWhiteBox().g1NumMaxRegions(), numUsedRegions

   238             );

   240             deallocate();

   241             System.gc();

   243             muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();

   244             muAuxDataFree = WhiteBox.getWhiteBox().g1AuxiliaryMemoryUsage();

   246             numUsedRegions = WhiteBox.getWhiteBox().g1NumMaxRegions()

   247                     - WhiteBox.getWhiteBox().g1NumFreeRegions();

   248             auxFree = (float)muAuxDataFree.getUsed() / numUsedRegions;

   250             System.out.format("Free aux data ratio= %f, regions max= %d, used= %d\n",

   251                     auxFree, WhiteBox.getWhiteBox().g1NumMaxRegions(), numUsedRegions

   252             );

   254             Asserts.assertLessThanOrEqual(muFree.getCommitted(), muFull.getCommitted(),

   255                     String.format("heap decommit failed - full > free: %d > %d",

   256                             muFree.getCommitted(), muFull.getCommitted()

   257                     )

   258             );

   260             System.out.format("State               used   committed\n");

   261             System.out.format("Full aux data: %10d %10d\n", muAuxDataFull.getUsed(), muAuxDataFull.getCommitted());

   262             System.out.format("Free aux data: %10d %10d\n", muAuxDataFree.getUsed(), muAuxDataFree.getCommitted());

   264             // if decommited check that aux data has same ratio

   265             if (muFree.getCommitted() < muFull.getCommitted()) {

   266                 Asserts.assertLessThanOrEqual(auxFree, auxFull,

   267                         String.format("auxiliary data decommit failed - full > free: %f > %f",

   268                                 auxFree, auxFull

   269                         )

   270                 );

   271             }

   272         }

   274         private void allocate() {

   275             for (int r = 0; r < REGIONS_TO_ALLOCATE; r++) {

   276                 for (int i = 0; i < NUM_OBJECTS_PER_REGION; i++) {

   277                     GarbageObject g = new GarbageObject(REGION_SIZE

   278                             / NUM_OBJECTS_PER_REGION);

   279                     garbage.add(g);

   280                 }

   281             }

   282         }

   284         /**

   285          * Iterate through all allocated objects, and link to objects in another

   286          * regions

   287          */

   288         private void link() {

   289             for (int ig = 0; ig < garbage.size(); ig++) {

   290                 int regionNumber = ig / NUM_OBJECTS_PER_REGION;

   292                 for (int i = 0; i < NUM_LINKS; i++) {

   293                     int regionToLink;

   294                     do {

   295                         regionToLink = (int) (Math.random() * REGIONS_TO_ALLOCATE);

   296                     } while (regionToLink == regionNumber);

   298                     // get random garbage object from random region

   299                     garbage.get(ig).addRef(garbage.get(regionToLink

   300                             * NUM_OBJECTS_PER_REGION + (int) (Math.random()

   301                             * NUM_OBJECTS_PER_REGION)));

   302                 }

   303             }

   304         }

   306         private void mutate() {

   307             for (int ig = 0; ig < garbage.size(); ig++) {

   308                 garbage.get(ig).mutate();

   309             }

   310         }

   312         private void deallocate() {

   313             garbage.clear();

   314             System.gc();

   315         }

   317         static long getMemoryUsedByTest() {

   318             return REGIONS_TO_ALLOCATE * REGION_SIZE;

   319         }

   321         private static final int REGIONS_TO_ALLOCATE = 100;

   322         private static final int NUM_OBJECTS_PER_REGION = 10;

   323         private static final int NUM_LINKS = 20; // how many links create for each object

   324     }

   325 }

Mercurial > jdk8-mips64-public > hotspot / file revision

test/gc/g1/TestShrinkAuxiliaryData.java@6cbff0651f1a

test/gc/g1/TestShrinkAuxiliaryData.java