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:TieredStopAtLevel=4 -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:TieredStopAtLevel=4 -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 }