1 /* 2 * Copyright (c) 2016, 2018, Red Hat, Inc. 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 * 23 */ 24 25 /* 26 * @test TestHumongousMoves 27 * @summary Check Shenandoah reacts on setting humongous moves correctly 28 * @key randomness 29 * @requires vm.gc.Shenandoah 30 * @library /test/lib 31 * 32 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g 33 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive 34 * -XX:-ShenandoahHumongousMoves 35 * -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify 36 * TestHumongousMoves 37 * 38 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g 39 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive 40 * -XX:+ShenandoahHumongousMoves 41 * -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify 42 * TestHumongousMoves 43 */ 44 45 import java.util.Random; 46 import jdk.test.lib.Utils; 47 48 public class TestHumongousMoves { 49 50 static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation 51 52 static volatile Object sink; 53 54 public static void main(String[] args) throws Exception { 55 final int min = 0; 56 final int max = 384 * 1024; 57 long count = TARGET_MB * 1024 * 1024 / (16 + 4 * (min + (max - min) / 2)); 58 59 Random r = Utils.getRandomInstance(); 60 for (long c = 0; c < count; c++) { 61 sink = new int[min + r.nextInt(max - min)]; 62 } 63 } 64 65 }