jdk8-mips64-public/hotspot: test/gc/g1/TestEagerReclaimHumongousRegions2.java@14b8221771dc (annotated)

test/gc/g1/TestEagerReclaimHumongousRegions2.java@14b8221771dc (annotated)

test/gc/g1/TestEagerReclaimHumongousRegions2.java

Wed, 03 Sep 2014 09:25:44 +0200

author: tschatzl
date: Wed, 03 Sep 2014 09:25:44 +0200
changeset 7097: 14b8221771dc
parent 7047: 2d1534aa7131
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 2014, 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.
  */
 /*
  * @test TestEagerReclaimHumongousRegions2
  * @bug 8051973
  * @summary Test to make sure that eager reclaim of humongous objects correctly clears
  * mark bitmaps at reclaim.
  * @key gc
  * @library /testlibrary
  */
 import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.Random;
 import com.oracle.java.testlibrary.OutputAnalyzer;
 import com.oracle.java.testlibrary.ProcessTools;
 // An object that has a few references to other instances to slow down marking.
 class ObjectWithSomeRefs {
     public ObjectWithSomeRefs other1;
     public ObjectWithSomeRefs other2;
     public ObjectWithSomeRefs other3;
     public ObjectWithSomeRefs other4;
 }
 class ReclaimRegionFast {
     public static final long MAX_MILLIS_FOR_RUN = 50 * 1000; // The maximum runtime for the actual test.
     public static final int M = 1024*1024;
     public static LinkedList<Object> garbageList = new LinkedList<Object>();
     public static void genGarbage(Object large) {
         for (int i = 0; i < 64*1024; i++) {
             Object[] garbage = new Object[50];
             garbage[0] = large;
             garbageList.add(garbage);
         }
         garbageList.clear();
     }
     public static ArrayList<ObjectWithSomeRefs> longList = new ArrayList<ObjectWithSomeRefs>();
     public static void main(String[] args) {
         for (int i = 0; i < 16*1024; i++) {
              longList.add(new ObjectWithSomeRefs());
         }
         Random rnd = new Random();
         for (int i = 0; i < longList.size(); i++) {
              int len = longList.size();
              longList.get(i).other1 = longList.get(rnd.nextInt(len));
              longList.get(i).other2 = longList.get(rnd.nextInt(len));
              longList.get(i).other3 = longList.get(rnd.nextInt(len));
              longList.get(i).other4 = longList.get(rnd.nextInt(len));
         }
         int[] large1 = new int[M];
         int[] large2 = null;
         int[] large3 = null;
         int[] large4 = null;
         Object ref_from_stack = large1;
         long start_millis = System.currentTimeMillis();
         for (int i = 0; i < 20; i++) {
             long current_millis = System.currentTimeMillis();
             if ((current_millis - start_millis) > MAX_MILLIS_FOR_RUN) {
               System.out.println("Finishing test because maximum runtime exceeded");
               break;
             }
             // A set of large objects that will be reclaimed eagerly - and hopefully marked.
             large1 = new int[M - 20];
             large2 = new int[M - 20];
             large3 = new int[M - 20];
             large4 = new int[M - 20];
             genGarbage(large1);
             // Make sure that the compiler cannot completely remove
             // the allocation of the large object until here.
             System.out.println(large1 + " " + large2 + " " + large3 + " " + large4);
         }
         // Keep the reference to the first object alive.
         System.out.println(ref_from_stack);
     }
 }
 public class TestEagerReclaimHumongousRegions2 {
     public static void main(String[] args) throws Exception {
         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
             "-XX:+UseG1GC",
             "-Xms128M",
             "-Xmx128M",
             "-Xmn2M",
             "-XX:G1HeapRegionSize=1M",
             "-XX:InitiatingHeapOccupancyPercent=0", // Want to have as much as possible initial marks.
             "-XX:+PrintGC",
             "-XX:+VerifyAfterGC",
             "-XX:ConcGCThreads=1", // Want to make marking as slow as possible.
             "-XX:+IgnoreUnrecognizedVMOptions", // G1VerifyBitmaps is develop only.
             "-XX:+G1VerifyBitmaps",
             ReclaimRegionFast.class.getName());
         OutputAnalyzer output = new OutputAnalyzer(pb.start());
         output.shouldHaveExitValue(0);
     }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

test/gc/g1/TestEagerReclaimHumongousRegions2.java@14b8221771dc (annotated)

test/gc/g1/TestEagerReclaimHumongousRegions2.java