1 /* 2 * Copyright (c) 2016, Red Hat, Inc. and/or its affiliates. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 /* 25 * @test AllocHumongousFragment 26 * @summary Make sure Shenandoah can recover from humongous allocation fragmentation 27 * 28 * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify AllocHumongousFragment 29 * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify AllocHumongousFragment 30 * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive -XX:+ShenandoahDegeneratedGC AllocHumongousFragment 31 * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=passive -XX:-ShenandoahDegeneratedGC AllocHumongousFragment 32 * 33 * @run main/othervm/timeout=240 -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot -XX:+ShenandoahVerify AllocHumongousFragment 34 * @run main/othervm/timeout=240 -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahAllocFailureALot -XX:+ShenandoahVerify AllocHumongousFragment 35 * @run main/othervm/timeout=240 -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot AllocHumongousFragment 36 * @run main/othervm/timeout=240 -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahAllocFailureALot AllocHumongousFragment 37 * 38 * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=adaptive -XX:+ShenandoahVerify AllocHumongousFragment 39 * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=static -XX:+ShenandoahVerify AllocHumongousFragment 40 * 41 * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=adaptive AllocHumongousFragment 42 * @run main/othervm -verbose:gc -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g -XX:ShenandoahTargetNumRegions=2048 -XX:ShenandoahGCHeuristics=static AllocHumongousFragment 43 */ 44 45 import java.util.*; 46 import java.util.concurrent.*; 47 48 public class AllocHumongousFragment { 49 50 static final long TARGET_MB = Long.getLong("target", 30_000); // 30 Gb allocations 51 static final long LIVE_MB = Long.getLong("occupancy", 700); // 700 Mb alive 52 53 static volatile Object sink; 54 55 static List<int[]> objects; 56 57 public static void main(String[] args) throws Exception { 58 final int min = 128*1024; 59 final int max = 16*1024*1024; 60 final long count = TARGET_MB * 1024 * 1024 / (16 + 4*(min + (max-min)/2)); 61 62 objects = new ArrayList<>(); 63 long current = 0; 64 65 Random r = new Random(); 66 for (long c = 0; c < count; c++) { 67 while (current > LIVE_MB * 1024 * 1024) { 68 int idx = ThreadLocalRandom.current().nextInt(objects.size()); 69 int[] remove = objects.remove(idx); 70 current -= remove.length * 4 + 16; 71 } 72 73 int[] newObj = new int[min + r.nextInt(max-min)]; 74 current += newObj.length * 4 + 16; 75 objects.add(newObj); 76 sink = new Object(); 77 78 System.out.println("Allocated: " + (current / 1024 / 1024) + " Mb"); 79 } 80 } 81 82 }