author | chegar |
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branch | datagramsocketimpl-branch |
changeset 58679 | 9c3209ff7550 |
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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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* @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 & !vm.graal.enabled |
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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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* |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive |
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* -XX:+ShenandoahDegeneratedGC |
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* TestStringDedupStress |
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* |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive |
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* -XX:-ShenandoahDegeneratedGC |
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* TestStringDedupStress |
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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 & !vm.graal.enabled |
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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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* |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC |
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* -DtargetStrings=3000000 |
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* TestStringDedupStress |
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* |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive |
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* -DtargetStrings=2000000 |
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* TestStringDedupStress |
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* |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive |
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* -XX:+ShenandoahOOMDuringEvacALot |
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* -DtargetStrings=2000000 |
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* TestStringDedupStress |
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* |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact |
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* TestStringDedupStress |
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* |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC |
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* -XX:ShenandoahUpdateRefsEarly=off |
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* -DtargetStrings=3000000 |
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* TestStringDedupStress |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact |
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* -XX:ShenandoahUpdateRefsEarly=off |
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* -DtargetStrings=2000000 |
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* TestStringDedupStress |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive |
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* -DtargetStrings=2000000 |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:ShenandoahUpdateRefsEarly=off -XX:+ShenandoahOOMDuringEvacALot |
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* -DtargetStrings=2000000 |
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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 & !vm.graal.enabled |
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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 -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal |
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* TestStringDedupStress |
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* |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal -XX:ShenandoahGCHeuristics=aggressive |
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* -DtargetStrings=2000000 |
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* TestStringDedupStress |
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* |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal |
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* -XX:+ShenandoahOOMDuringEvacALot |
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* -DtargetStrings=2000000 |
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* TestStringDedupStress |
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* |
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* @run main/othervm -Xmx1g -Xlog:gc+stats -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication |
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* -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal -XX:ShenandoahGCHeuristics=aggressive |
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* -XX:+ShenandoahOOMDuringEvacALot |
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* -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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public class TestStringDedupStress { |
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private static Field valueField; |
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private static Unsafe unsafe; |
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|
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private static final int TARGET_STRINGS = Integer.getInteger("targetStrings", 2_500_000); |
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private static final long MAX_REWRITE_GC_CYCLES = 6; |
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private static final long MAX_REWRITE_TIME = 30*1000; // ms |
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|
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private static final int UNIQUE_STRINGS = 20; |
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|
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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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153 |
|
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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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160 |
|
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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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168 |
|
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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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|
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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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|
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public String str() { |
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return str; |
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} |
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181 |
|
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public int id() { |
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return id; |
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} |
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185 |
} |
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186 |
|
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// Generate uniqueStrings number of strings |
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188 |
private static void generateStrings(ArrayList<StringAndId> strs, int uniqueStrings) { |
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189 |
Random rn = new Random(); |
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for (int u = 0; u < uniqueStrings; u++) { |
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int n = rn.nextInt(uniqueStrings); |
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strs.add(new StringAndId("Unique String " + n, n)); |
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193 |
} |
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} |
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|
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private static int verifyDedupString(ArrayList<StringAndId> strs) { |
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Map<Object, StringAndId> seen = new HashMap<>(TARGET_STRINGS*2); |
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int total = 0; |
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int dedup = 0; |
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|
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for (StringAndId item : strs) { |
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total++; |
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StringAndId existingItem = seen.get(getValue(item.str())); |
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if (existingItem == null) { |
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seen.put(getValue(item.str()), item); |
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} else { |
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if (item.id() != existingItem.id() || |
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!item.str().equals(existingItem.str())) { |
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System.out.println("StringDedup error:"); |
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System.out.println("id: " + item.id() + " != " + existingItem.id()); |
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System.out.println("or String: " + item.str() + " != " + existingItem.str()); |
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throw new RuntimeException("StringDedup Test failed"); |
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} else { |
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dedup++; |
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} |
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216 |
} |
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} |
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System.out.println("Dedup: " + dedup + "/" + total + " unique: " + (total - dedup)); |
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return (total - dedup); |
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} |
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static volatile ArrayList<StringAndId> astrs = new ArrayList<>(); |
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static GarbageCollectorMXBean gcCycleMBean; |
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public static void main(String[] args) { |
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Random rn = new Random(); |
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for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) { |
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if ("Shenandoah Cycles".equals(bean.getName())) { |
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gcCycleMBean = bean; |
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break; |
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} |
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} |
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|
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if (gcCycleMBean == null) { |
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throw new RuntimeException("Can not find Shenandoah GC cycle mbean"); |
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} |
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// Generate roughly TARGET_STRINGS strings, only UNIQUE_STRINGS are unique |
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int genIters = TARGET_STRINGS / UNIQUE_STRINGS; |
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for (int index = 0; index < genIters; index++) { |
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generateStrings(astrs, UNIQUE_STRINGS); |
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} |
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|
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long cycleBeforeRewrite = gcCycleMBean.getCollectionCount(); |
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long timeBeforeRewrite = System.currentTimeMillis(); |
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|
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long loop = 1; |
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while (true) { |
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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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// enough time is spent waiting for GC to happen |
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if (System.currentTimeMillis() - timeBeforeRewrite >= MAX_REWRITE_TIME) { |
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break; |
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} |
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} |
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} |
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verifyDedupString(astrs); |
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} |
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} |