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=dynamic -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
35 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=continuous -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
36 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=passive -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
37 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=generational -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
38 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=LRU -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
39 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=connected -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats ShenandoahStrDedupStress
40 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats -XX:ShenandoahUpdateRefsEarly=off ShenandoahStrDedupStress
41 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=continuous -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats -XX:ShenandoahUpdateRefsEarly=off ShenandoahStrDedupStress
42 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=aggressive -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats -XX:ShenandoahUpdateRefsEarly=off ShenandoahStrDedupStress
43 * @run main/othervm -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCHeuristics=dynamic -XX:+UseStringDeduplication -Xmx2G -Xlog:gc+stats -XX:ShenandoahUpdateRefsEarly=off ShenandoahStrDedupStress
44 */
45
46 import java.lang.reflect.*;
47 import java.util.*;
48 import sun.misc.*;
49
50 public class ShenandoahStrDedupStress {
51 private static Field valueField;
52 private static Unsafe unsafe;
53
54 private static final int UniqueStrings = 20;
55 static {
56 try {
57 Field field = Unsafe.class.getDeclaredField("theUnsafe");
58 field.setAccessible(true);
59 unsafe = (Unsafe)field.get(null);
60
61 valueField = String.class.getDeclaredField("value");
62 valueField.setAccessible(true);
63 } catch (Exception e) {
64 throw new RuntimeException(e);
65 }
66 }
67
68 private static Object getValue(String string) {
69 try {
70 return valueField.get(string);
71 } catch (Exception e) {
72 throw new RuntimeException(e);
73 }
74 }
75
76 static class StringAndId {
77 private String str;
78 private int id;
79 public StringAndId(String str, int id) {
80 this.str = str;
81 this.id = id;
82 }
83
84 public String str() { return str; }
85 public int id() { return id; }
86 }
87
88 private static void generateStrings(ArrayList<StringAndId> strs, int unique_strs) {
89 Random rn = new Random();
90 for (int u = 0; u < unique_strs; u ++) {
91 int n = rn.nextInt() % 10;
92 n = Math.max(n, 2);
93 for (int index = 0; index < n; index ++) {
94 strs.add(new StringAndId("Unique String " + u, u));
95 }
96 }
97 }
98
99 private static int verifyDedepString(ArrayList<StringAndId> strs) {
100 HashMap<Object, StringAndId> seen = new HashMap<>();
101 int total = 0;
102 int dedup = 0;
103
104 for (StringAndId item : strs) {
105 total ++;
106 StringAndId existing_item = seen.get(getValue(item.str()));
107 if (existing_item == null) {
108 seen.put(getValue(item.str()), item);
109 } else {
110 if (item.id() != existing_item.id() ||
111 !item.str().equals(existing_item.str())) {
112 System.out.println("StringDedup error:");
113 System.out.println("String: " + item.str() + " != " + existing_item.str());
114 throw new RuntimeException("StringDedup Test failed");
115 } else {
116 dedup ++;
117 }
118 }
119 }
120 System.out.println("Dedup: " + dedup + "/" + total + " unique: " + (total - dedup));
121 return (total - dedup);
122 }
123
124 static volatile ArrayList<StringAndId> astrs = new ArrayList<>();
125 public static void main(String[] args) {
126 Random rn = new Random();
127
128 for(int index = 0; index < 100000; index ++) {
129 generateStrings(astrs, UniqueStrings);
130 }
131
132 for (int loop = 1; loop < 10000; loop ++) {
133 for (int index = 0; index < 10000; index ++) {
134 StringAndId item = astrs.get(index);
135 int n = rn.nextInt() % UniqueStrings;
136 item.str = "Unique String " + n;
137 }
138 }
139
140 verifyDedepString(astrs);
141 }
142 }