1 /* 2 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved. 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 TestHumongousThreshold 26 * @key gc 27 * @requires vm.gc.Shenandoah 28 * 29 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:+ShenandoahVerify TestHumongousThreshold 30 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:ShenandoahHumongousThreshold=50 -XX:+ShenandoahVerify TestHumongousThreshold 31 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:ShenandoahHumongousThreshold=90 -XX:+ShenandoahVerify TestHumongousThreshold 32 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:ShenandoahHumongousThreshold=99 -XX:+ShenandoahVerify TestHumongousThreshold 33 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:ShenandoahHumongousThreshold=100 -XX:+ShenandoahVerify TestHumongousThreshold 34 * 35 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:ShenandoahHumongousThreshold=90 -XX:ShenandoahGCHeuristics=aggressive TestHumongousThreshold 36 */ 37 38 import java.util.Random; 39 40 public class TestHumongousThreshold { 41 42 static final long TARGET_MB = Long.getLong("target", 20_000); // 20 Gb allocation 43 44 static volatile Object sink; 45 46 public static void main(String[] args) throws Exception { 47 final int min = 0; 48 final int max = 384 * 1024; 49 long count = TARGET_MB * 1024 * 1024 / (16 + 4 * (min + (max - min) / 2)); 50 51 Random r = new Random(); 52 for (long c = 0; c < count; c++) { 53 sink = new int[min + r.nextInt(max - min)]; 54 } 55 } 56 57 }