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 TestManyThreads 26 * @key gc 27 * @requires vm.gc.Epsilon 28 * @summary Test allocations from many threads 29 * 30 * @run main/othervm -Xmx128m -Xss512k -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads 31 * @run main/othervm -Xmx128m -Xss512k -Xint -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads 32 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads 33 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads 34 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:-TieredCompilation -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads 35 * 36 * @run main/othervm -Xmx128m -Xss512k -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads 37 * @run main/othervm -Xmx128m -Xss512k -Xint -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads 38 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads 39 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads 40 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:-TieredCompilation -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads 41 */ 42 43 import java.util.concurrent.atomic.*; 44 45 public class TestManyThreads { 46 47 static int COUNT = Integer.getInteger("count", 128); // 128 * 4M max tlabs = 512M, would overflow without TLAB sizing 48 49 static volatile Object sink; 50 static volatile Throwable failed; 51 static final AtomicInteger allocated = new AtomicInteger(); 52 53 public static void workload() { 54 try { 55 sink = new Object(); 56 allocated.incrementAndGet(); 57 Thread.sleep(3600 * 1000); 58 } catch (Throwable e) { 59 failed = e; 60 } 61 } 62 63 public static void main(String[] args) throws Throwable { 64 for (int c = 0; c < COUNT; c++) { 65 Thread t = new Thread(TestManyThreads::workload); 66 t.setDaemon(true); 67 t.start(); 68 } 69 70 while ((failed == null) && (allocated.get() != COUNT)) { 71 Thread.sleep(100); 72 } 73 74 if (failed != null) { 75 throw failed; 76 } 77 } 78 79 }