1 /*
2 * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 /*
25 * @test TestShenandoahStringDedup.java
26 * @summary Test Shenandoah string deduplication implementation
27 * @key gc
28 * @library /test/lib
29 * @modules java.base/jdk.internal.misc:open
30 * @modules java.base/java.lang:open
31 * java.management
32 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
33 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
34 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats -XX:+ShenandoahOOMDuringEvacALot ShenandoahStrDedupStress
35 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=dynamic -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
36 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=continuous -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
37 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=passive -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
38 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=generational -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
39 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=LRU -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
40 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=connected -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
41 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats -XX:ShenandoahUpdateRefsEarly=off ShenandoahStrDedupStress
42 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=continuous -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats -XX:ShenandoahUpdateRefsEarly=off ShenandoahStrDedupStress
43 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats -XX:ShenandoahUpdateRefsEarly=off ShenandoahStrDedupStress
44 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=dynamic -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats -XX:ShenandoahUpdateRefsEarly=off ShenandoahStrDedupStress
45 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats -XX:ShenandoahUpdateRefsEarly=off -XX:+ShenandoahOOMDuringEvacALot ShenandoahStrDedupStress
46 */
47
48 import java.lang.reflect.*;
49 import java.util.*;
50 import sun.misc.*;
51
52 public class ShenandoahStrDedupStress {
53 private static Field valueField;
54 private static Unsafe unsafe;
55
56 private static final int UniqueStrings = 20;
57 static {
58 try {
59 Field field = Unsafe.class.getDeclaredField("theUnsafe");
60 field.setAccessible(true);
61 unsafe = (Unsafe)field.get(null);
62
63 valueField = String.class.getDeclaredField("value");
64 valueField.setAccessible(true);
65 } catch (Exception e) {
66 throw new RuntimeException(e);
67 }
68 }
69
70 private static Object getValue(String string) {
71 try {
72 return valueField.get(string);
73 } catch (Exception e) {
74 throw new RuntimeException(e);
75 }
76 }
77
78 static class StringAndId {
79 private String str;
80 private int id;
81 public StringAndId(String str, int id) {
82 this.str = str;
83 this.id = id;
84 }
85
86 public String str() { return str; }
87 public int id() { return id; }
88 }
89
90 private static void generateStrings(ArrayList<StringAndId> strs, int unique_strs) {
91 Random rn = new Random();
92 for (int u = 0; u < unique_strs; u ++) {
93 int n = rn.nextInt() % 10;
94 n = Math.max(n, 2);
95 for (int index = 0; index < n; index ++) {
96 strs.add(new StringAndId("Unique String " + u, u));
97 }
98 }
99 }
100
101 private static int verifyDedepString(ArrayList<StringAndId> strs) {
102 HashMap<Object, StringAndId> seen = new HashMap<>();
103 int total = 0;
104 int dedup = 0;
105
106 for (StringAndId item : strs) {
107 total ++;
108 StringAndId existing_item = seen.get(getValue(item.str()));
109 if (existing_item == null) {
110 seen.put(getValue(item.str()), item);
111 } else {
112 if (item.id() != existing_item.id() ||
113 !item.str().equals(existing_item.str())) {
114 System.out.println("StringDedup error:");
115 System.out.println("String: " + item.str() + " != " + existing_item.str());
116 throw new RuntimeException("StringDedup Test failed");
117 } else {
118 dedup ++;
119 }
120 }
121 }
122 System.out.println("Dedup: " + dedup + "/" + total + " unique: " + (total - dedup));
123 return (total - dedup);
124 }
125
126 static volatile ArrayList<StringAndId> astrs = new ArrayList<>();
127 public static void main(String[] args) {
128 Random rn = new Random();
129
130 for(int index = 0; index < 100000; index ++) {
131 generateStrings(astrs, UniqueStrings);
132 }
133
134 for (int loop = 1; loop < 10000; loop ++) {
135 for (int index = 0; index < 10000; index ++) {
136 StringAndId item = astrs.get(index);
137 int n = rn.nextInt() % UniqueStrings;
138 item.str = "Unique String " + n;
139 }
140 }
141
142 verifyDedepString(astrs);
143 }
144 }