author | rkennke |
Mon, 10 Dec 2018 15:47:44 +0100 | |
changeset 52925 | 9c18c9d839d3 |
child 54749 | 98558b7544c7 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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|
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/* |
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* @test TestStringDedupStress |
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* @summary Test Shenandoah string deduplication implementation |
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* @key gc |
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* @requires vm.gc.Shenandoah |
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* @library /test/lib |
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* @modules java.base/jdk.internal.misc:open |
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* @modules java.base/java.lang:open |
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* java.management |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -DtargetStrings=3000000 |
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* TestStringDedupStress |
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* |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=aggressive -DtargetStrings=2000000 |
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* TestStringDedupStress |
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* |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot -DtargetStrings=2000000 |
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* TestStringDedupStress |
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* |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=static -DtargetStrings=4000000 |
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* TestStringDedupStress |
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* |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=compact |
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* TestStringDedupStress |
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* |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=passive -XX:+ShenandoahDegeneratedGC -DtargetOverwrites=40000000 |
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* TestStringDedupStress |
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* |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=passive -XX:-ShenandoahDegeneratedGC -DtargetOverwrites=40000000 |
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* TestStringDedupStress |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=traversal |
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* TestStringDedupStress |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahUpdateRefsEarly=off -DtargetStrings=3000000 |
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* TestStringDedupStress |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=compact -XX:ShenandoahUpdateRefsEarly=off -DtargetStrings=2000000 |
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* TestStringDedupStress |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=aggressive -XX:ShenandoahUpdateRefsEarly=off -DtargetStrings=2000000 |
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* TestStringDedupStress |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=static -XX:ShenandoahUpdateRefsEarly=off -DtargetOverwrites=4000000 |
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* TestStringDedupStress |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=aggressive -XX:ShenandoahUpdateRefsEarly=off -XX:+ShenandoahOOMDuringEvacALot -DtargetStrings=2000000 |
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* TestStringDedupStress |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx512M -Xlog:gc+stats |
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* -XX:ShenandoahGCHeuristics=traversal -XX:+ShenandoahOOMDuringEvacALot -DtargetStrings=2000000 |
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* TestStringDedupStress |
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*/ |
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import java.lang.management.*; |
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import java.lang.reflect.*; |
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import java.util.*; |
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import sun.misc.*; |
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|
96 |
public class TestStringDedupStress { |
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|
97 |
private static Field valueField; |
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|
98 |
private static Unsafe unsafe; |
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|
99 |
|
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|
100 |
private static long TARGET_STRINGS = Long.getLong("targetStrings", 2_500_000); |
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|
101 |
private static long TARGET_OVERWRITES = Long.getLong("targetOverwrites", 600_000); |
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|
102 |
private static final long MAX_REWRITE_GC_CYCLES = 6; |
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|
103 |
|
9c18c9d839d3
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|
104 |
private static final int UNIQUE_STRINGS = 20; |
9c18c9d839d3
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|
105 |
|
9c18c9d839d3
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|
106 |
static { |
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changeset
|
107 |
try { |
9c18c9d839d3
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|
108 |
Field field = Unsafe.class.getDeclaredField("theUnsafe"); |
9c18c9d839d3
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|
109 |
field.setAccessible(true); |
9c18c9d839d3
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|
110 |
unsafe = (Unsafe) field.get(null); |
9c18c9d839d3
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|
111 |
|
9c18c9d839d3
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|
112 |
valueField = String.class.getDeclaredField("value"); |
9c18c9d839d3
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|
113 |
valueField.setAccessible(true); |
9c18c9d839d3
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|
114 |
} catch (Exception e) { |
9c18c9d839d3
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|
115 |
throw new RuntimeException(e); |
9c18c9d839d3
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|
116 |
} |
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|
117 |
} |
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|
118 |
|
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|
119 |
private static Object getValue(String string) { |
9c18c9d839d3
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|
120 |
try { |
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121 |
return valueField.get(string); |
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122 |
} catch (Exception e) { |
9c18c9d839d3
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|
123 |
throw new RuntimeException(e); |
9c18c9d839d3
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|
124 |
} |
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|
125 |
} |
9c18c9d839d3
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|
126 |
|
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|
127 |
static class StringAndId { |
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|
128 |
private String str; |
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|
129 |
private int id; |
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|
130 |
|
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|
131 |
public StringAndId(String str, int id) { |
9c18c9d839d3
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|
132 |
this.str = str; |
9c18c9d839d3
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|
133 |
this.id = id; |
9c18c9d839d3
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|
134 |
} |
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|
135 |
|
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|
136 |
public String str() { |
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|
137 |
return str; |
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|
138 |
} |
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|
139 |
|
9c18c9d839d3
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|
140 |
public int id() { |
9c18c9d839d3
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|
141 |
return id; |
9c18c9d839d3
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|
142 |
} |
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|
143 |
} |
9c18c9d839d3
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|
144 |
|
9c18c9d839d3
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|
145 |
// Generate uniqueStrings number of strings |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
146 |
private static void generateStrings(ArrayList<StringAndId> strs, int uniqueStrings) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
147 |
Random rn = new Random(); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
148 |
for (int u = 0; u < uniqueStrings; u++) { |
9c18c9d839d3
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|
149 |
int n = rn.nextInt(uniqueStrings); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
150 |
strs.add(new StringAndId("Unique String " + n, n)); |
9c18c9d839d3
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|
151 |
} |
9c18c9d839d3
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|
152 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
153 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
154 |
private static int verifyDedepString(ArrayList<StringAndId> strs) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
155 |
HashMap<Object, StringAndId> seen = new HashMap<>(); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
156 |
int total = 0; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
157 |
int dedup = 0; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
158 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
159 |
for (StringAndId item : strs) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
160 |
total++; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
161 |
StringAndId existingItem = seen.get(getValue(item.str())); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
162 |
if (existingItem == null) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
163 |
seen.put(getValue(item.str()), item); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
164 |
} else { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
165 |
if (item.id() != existingItem.id() || |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
166 |
!item.str().equals(existingItem.str())) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
167 |
System.out.println("StringDedup error:"); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
168 |
System.out.println("id: " + item.id() + " != " + existingItem.id()); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
169 |
System.out.println("or String: " + item.str() + " != " + existingItem.str()); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
170 |
throw new RuntimeException("StringDedup Test failed"); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
171 |
} else { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
172 |
dedup++; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
173 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
174 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
175 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
176 |
System.out.println("Dedup: " + dedup + "/" + total + " unique: " + (total - dedup)); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
177 |
return (total - dedup); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
178 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
179 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
180 |
static volatile ArrayList<StringAndId> astrs = new ArrayList<>(); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
181 |
static GarbageCollectorMXBean gcCycleMBean; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
182 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
183 |
public static void main(String[] args) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
184 |
Random rn = new Random(); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
185 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
186 |
for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
187 |
if ("Shenandoah Cycles".equals(bean.getName())) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
188 |
gcCycleMBean = bean; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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diff
changeset
|
189 |
break; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
190 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
191 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
192 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
193 |
if (gcCycleMBean == null) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
194 |
throw new RuntimeException("Can not find Shenandoah GC cycle mbean"); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
195 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
196 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
197 |
// Generate roughly TARGET_STRINGS strings, only UNIQUE_STRINGS are unique |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
198 |
long genIters = TARGET_STRINGS / UNIQUE_STRINGS; |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
199 |
for (long index = 0; index < genIters; index++) { |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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|
200 |
generateStrings(astrs, UNIQUE_STRINGS); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
201 |
} |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
202 |
|
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
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changeset
|
203 |
long cycleBeforeRewrite = gcCycleMBean.getCollectionCount(); |
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204 |
|
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for (long loop = 1; loop < TARGET_OVERWRITES; loop++) { |
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int arrSize = astrs.size(); |
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int index = rn.nextInt(arrSize); |
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StringAndId item = astrs.get(index); |
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int n = rn.nextInt(UNIQUE_STRINGS); |
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item.str = "Unique String " + n; |
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item.id = n; |
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|
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if (loop % 1000 == 0) { |
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// enough GC cycles for rewritten strings to be deduplicated |
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if (gcCycleMBean.getCollectionCount() - cycleBeforeRewrite >= MAX_REWRITE_GC_CYCLES) { |
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break; |
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} |
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} |
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} |
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verifyDedepString(astrs); |
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} |
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} |