1 /* 2 * Copyright (c) 2017, 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 * @test TestElasticTLABDecay 26 * @key gc 27 * @requires vm.gc.Epsilon 28 * @summary Epsilon is able to work with/without elastic TLABs 29 * 30 * @run main/othervm -Xmx1g -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonElasticTLAB -XX:-EpsilonElasticTLABDecay TestElasticTLABDecay 31 * @run main/othervm -Xmx1g -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonElasticTLAB -XX:+EpsilonElasticTLABDecay -XX:EpsilonTLABDecayTime=1 TestElasticTLABDecay 32 * @run main/othervm -Xmx1g -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EpsilonElasticTLAB -XX:+EpsilonElasticTLABDecay -XX:EpsilonTLABDecayTime=100 TestElasticTLABDecay 33 */ 34 35 import java.util.Random; 36 37 public class TestElasticTLABDecay { 38 39 static long SEED = Long.getLong("seed", System.nanoTime()); 40 static int COUNT = Integer.getInteger("count", 3000); // ~500 MB allocation 41 42 static byte[][] arr; 43 44 public static void main(String[] args) throws Exception { 45 Random r = new Random(SEED); 46 47 arr = new byte[COUNT * 100][]; 48 for (int c = 0; c < COUNT; c++) { 49 arr[c] = new byte[c * 100]; 50 for (int v = 0; v < c; v++) { 51 arr[c][v] = (byte)(r.nextInt(255) & 0xFF); 52 } 53 Thread.sleep(5); 54 } 55 56 r = new Random(SEED); 57 for (int c = 0; c < COUNT; c++) { 58 byte[] b = arr[c]; 59 if (b.length != (c * 100)) { 60 throw new IllegalStateException("Failure: length = " + b.length + ", need = " + (c*100)); 61 } 62 for (int v = 0; v < c; v++) { 63 byte actual = b[v]; 64 byte expected = (byte)(r.nextInt(255) & 0xFF); 65 if (actual != expected) { 66 throw new IllegalStateException("Failure: expected = " + expected + ", actual = " + actual); 67 } 68 } 69 } 70 } 71 }