1 /*
   2  * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2020 SAP SE. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 import java.util.concurrent.CyclicBarrier;
  26 
  27 import static java.lang.System.currentTimeMillis;
  28 
  29 public class MetaspaceTestManyArenasManyThreads extends MetaspaceTestWithThreads {
  30 
  31     // Several threads allocate from a single arena.
  32     // This mimicks several threads loading classes via the same class loader.
  33 
  34     public MetaspaceTestManyArenasManyThreads(MetaspaceTestContext context, long testAllocationCeiling, int numThreads, int seconds) {
  35         super(context, testAllocationCeiling, numThreads, seconds);
  36     }
  37 
  38     public void runTest() throws Exception {
  39 
  40         long t_start = currentTimeMillis();
  41         long t_stop = t_start + (seconds * 1000);
  42 
  43         CyclicBarrier gate = new CyclicBarrier(numThreads + 1);
  44 
  45         final long ceilingPerThread = testAllocationCeiling / numThreads;
  46 
  47         for (int i = 0; i < numThreads; i ++) {
  48             // Create n test threads, each one with its own allocator/arena pair
  49             MetaspaceTestArena arena = context.createArena(RandomHelper.fiftyfifty(), ceilingPerThread);
  50             RandomAllocator allocator = new RandomAllocator(arena);
  51             RandomAllocatorThread thread = new RandomAllocatorThread(gate, allocator, i);
  52             threads[i] = thread;
  53             thread.start();
  54         }
  55 
  56         gate.await();
  57 
  58         // while test is running, skim the arenas and kill any arena which is saturated (has started getting an
  59         // untoward number of allocation failures)
  60         while (System.currentTimeMillis() < t_stop) {
  61 
  62             // Wait a bit
  63             Thread.sleep(200);
  64 
  65             for (RandomAllocatorThread t: threads) {
  66                 if (t.allocator.arena.numAllocationFailures > 0) {
  67                     t.interrupt();
  68                     t.join();
  69                     context.destroyArena(t.allocator.arena);
  70 
  71                     // Create a new arena, allocator, then a new thread (note: do not pass in a start gate this time
  72                     // since we do not need to wait) and fire it up.
  73                     MetaspaceTestArena arena = context.createArena(RandomHelper.fiftyfifty(), ceilingPerThread);
  74                     RandomAllocator allocator = new RandomAllocator(arena);
  75                     RandomAllocatorThread t2 = new RandomAllocatorThread(null, allocator, t.id);
  76                     threads[t.id] = t2;
  77                     t2.start();
  78                 }
  79             }
  80 
  81         }
  82 
  83         // Stop all threads.
  84         stopAllThreads();
  85 
  86         context.updateTotals();
  87         System.out.println("  ## Finished: " + context);
  88 
  89         context.checkStatistics();
  90 
  91         // Destroy all arenas; then purge the space.
  92         destroyArenasAndPurgeSpace();
  93 
  94         context.destroy();
  95 
  96         context.updateTotals();
  97 
  98         System.out.println("This took " + (System.currentTimeMillis() - t_start) + "ms");
  99 
 100     }
 101 
 102 }
 103