author | rkennke |
Mon, 10 Dec 2018 15:47:44 +0100 | |
changeset 52925 | 9c18c9d839d3 |
child 54777 | 206afa6372ae |
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 TestStringDedup |
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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:ShenandoahGCHeuristics=passive -XX:+ShenandoahDegeneratedGC -XX:+UseStringDeduplication -Xmx256M -Xlog:gc+stats TestStringDedup |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=passive -XX:-ShenandoahDegeneratedGC -XX:+UseStringDeduplication -Xmx256M -Xlog:gc+stats TestStringDedup |
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* |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive -XX:+UseStringDeduplication -Xmx256M -Xlog:gc+stats TestStringDedup |
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* |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+UseStringDeduplication -Xmx256M -Xlog:gc+stats TestStringDedup |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=traversal -XX:+UseStringDeduplication -Xmx256M -Xlog:gc+stats TestStringDedup |
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* |
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact -XX:+UseStringDeduplication -Xmx256M -Xlog:gc+stats TestStringDedup |
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*/ |
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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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public class TestStringDedup { |
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private static Field valueField; |
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private static Unsafe unsafe; |
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private static final int UniqueStrings = 20; |
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static { |
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try { |
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Field field = Unsafe.class.getDeclaredField("theUnsafe"); |
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field.setAccessible(true); |
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unsafe = (Unsafe) field.get(null); |
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valueField = String.class.getDeclaredField("value"); |
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valueField.setAccessible(true); |
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} catch (Exception e) { |
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throw new RuntimeException(e); |
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} |
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} |
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private static Object getValue(String string) { |
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try { |
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return valueField.get(string); |
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} catch (Exception e) { |
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throw new RuntimeException(e); |
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} |
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} |
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static class StringAndId { |
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private String str; |
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private int id; |
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public StringAndId(String str, int id) { |
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this.str = str; |
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this.id = id; |
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} |
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public String str() { |
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return str; |
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} |
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public int id() { |
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return id; |
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} |
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} |
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private static void generateStrings(ArrayList<StringAndId> strs, int unique_strs) { |
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Random rn = new Random(); |
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for (int u = 0; u < unique_strs; u++) { |
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int n = rn.nextInt() % 10; |
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n = Math.max(n, 2); |
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for (int index = 0; index < n; index++) { |
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strs.add(new StringAndId("Unique String " + u, u)); |
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} |
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} |
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} |
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104 |
|
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private static int verifyDedepString(ArrayList<StringAndId> strs) { |
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HashMap<Object, StringAndId> seen = new HashMap<>(); |
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int total = 0; |
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int dedup = 0; |
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109 |
|
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for (StringAndId item : strs) { |
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total++; |
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StringAndId existing_item = seen.get(getValue(item.str())); |
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if (existing_item == null) { |
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seen.put(getValue(item.str()), item); |
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} else { |
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if (item.id() != existing_item.id() || |
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!item.str().equals(existing_item.str())) { |
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System.out.println("StringDedup error:"); |
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System.out.println("String: " + item.str() + " != " + existing_item.str()); |
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throw new RuntimeException("StringDedup Test failed"); |
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121 |
} else { |
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dedup++; |
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123 |
} |
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124 |
} |
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125 |
} |
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System.out.println("Dedup: " + dedup + "/" + total + " unique: " + (total - dedup)); |
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return (total - dedup); |
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128 |
} |
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129 |
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public static void main(String[] args) { |
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ArrayList<StringAndId> astrs = new ArrayList<>(); |
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generateStrings(astrs, UniqueStrings); |
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System.gc(); |
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System.gc(); |
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System.gc(); |
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System.gc(); |
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System.gc(); |
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138 |
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if (verifyDedepString(astrs) != UniqueStrings) { |
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// Can not guarantee all strings are deduplicated, there can |
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// still have pending items in queues. |
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System.out.println("Not all strings are deduplicated"); |
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} |
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144 |
} |
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145 |
} |