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 /*
  26  * @test TestStringInternCleanup
  27  * @summary Check that Shenandoah cleans up interned strings
  28  * @requires vm.gc.Shenandoah
  29  *
  30  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  31  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  32  *      -XX:+ShenandoahDegeneratedGC -XX:+ShenandoahVerify
  33  *      TestStringInternCleanup
  34  *
  35  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  36  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  37  *      -XX:-ShenandoahDegeneratedGC -XX:+ShenandoahVerify
  38  *      TestStringInternCleanup
  39  *
  40  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  41  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  42  *      -XX:+ShenandoahDegeneratedGC
  43  *      TestStringInternCleanup
  44  *
  45  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  46  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
  47  *      -XX:-ShenandoahDegeneratedGC
  48  *      TestStringInternCleanup
  49  */
  50 
  51 /*
  52  * @test TestStringInternCleanup
  53  * @summary Check that Shenandoah cleans up interned strings
  54  * @requires vm.gc.Shenandoah
  55  *
  56  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  57  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
  58  *      TestStringInternCleanup
  59  *
  60  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  61  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
  62  *      -XX:+ShenandoahVerify
  63  *      TestStringInternCleanup
  64  *
  65  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  66  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
  67  *      TestStringInternCleanup
  68  *
  69  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  70  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
  71  *      TestStringInternCleanup
  72  *
  73  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:-ClassUnloadingWithConcurrentMark
  74  *      -XX:+UseShenandoahGC
  75  *      TestStringInternCleanup
  76  */
  77 
  78 /*
  79  * @test TestStringInternCleanup
  80  * @summary Check that Shenandoah cleans up interned strings
  81  * @requires vm.gc.Shenandoah
  82  *
  83  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  84  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
  85  *      -XX:+ShenandoahVerify
  86  *      TestStringInternCleanup
  87  *
  88  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  89  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
  90  *      -XX:+ShenandoahVerify
  91  *      TestStringInternCleanup
  92  *
  93  * @run main/othervm -Xmx64m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ClassUnloadingWithConcurrentMark
  94  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
  95  *      TestStringInternCleanup
  96  */
  97 
  98 public class TestStringInternCleanup {
  99 
 100     static final int COUNT = 1_000_000;
 101     static final int WINDOW = 1_000;
 102 
 103     static final String[] reachable = new String[WINDOW];
 104 
 105     public static void main(String[] args) throws Exception {
 106         int rIdx = 0;
 107         for (int c = 0; c < COUNT; c++) {
 108             reachable[rIdx] = ("LargeInternedString" + c).intern();
 109             rIdx++;
 110             if (rIdx >= WINDOW) {
 111                 rIdx = 0;
 112             }
 113         }
 114     }
 115 
 116 }