Mercurial > hg > truffle
comparison test/gc/g1/TestShrinkDefragmentedHeap.java @ 20460:df66e3a3c4c2
8041946: CMM Testing: 8u40 an allocated humongous object at the end of the heap should not prevents shrinking the heap
Summary: New test added
Reviewed-by: jwilhelm, tschatzl
Contributed-by: andrey.x.zakharov@oracle.com
author | jwilhelm |
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date | Thu, 11 Sep 2014 14:21:13 +0200 |
parents | |
children | 7a6313074325 |
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20459:a98dd542cd25 | 20460:df66e3a3c4c2 |
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1 /* | |
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 */ | |
23 | |
24 /** | |
25 * @test TestShrinkDefragmentedHeap | |
26 * @bug 8038423 | |
27 * @summary Verify that heap shrinks after GC in the presence of fragmentation due to humongous objects | |
28 * 1. allocate small objects mixed with humongous ones | |
29 * "ssssHssssHssssHssssHssssHssssHssssH" | |
30 * 2. release all allocated object except the last humongous one | |
31 * "..................................H" | |
32 * 3. invoke gc and check that memory returned to the system (amount of committed memory got down) | |
33 * | |
34 * @library /testlibrary | |
35 */ | |
36 import java.lang.management.ManagementFactory; | |
37 import java.lang.management.MemoryUsage; | |
38 import java.util.ArrayList; | |
39 import java.util.List; | |
40 import sun.management.ManagementFactoryHelper; | |
41 import static com.oracle.java.testlibrary.Asserts.*; | |
42 import com.oracle.java.testlibrary.ProcessTools; | |
43 import com.oracle.java.testlibrary.OutputAnalyzer; | |
44 | |
45 public class TestShrinkDefragmentedHeap { | |
46 // Since we store all the small objects, they become old and old regions are also allocated at the bottom of the heap | |
47 // together with humongous regions. So if there are a lot of old regions in the lower part of the heap, | |
48 // the humongous regions will be allocated in the upper part of the heap anyway. | |
49 // To avoid this the Eden needs to be big enough to fit all the small objects. | |
50 private static final int INITIAL_HEAP_SIZE = 200 * 1024 * 1024; | |
51 private static final int MINIMAL_YOUNG_SIZE = 190 * 1024 * 1024; | |
52 private static final int REGION_SIZE = 1 * 1024 * 1024; | |
53 | |
54 public static void main(String[] args) throws Exception, Throwable { | |
55 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( | |
56 "-XX:InitialHeapSize=" + INITIAL_HEAP_SIZE, | |
57 "-Xmn" + MINIMAL_YOUNG_SIZE, | |
58 "-XX:MinHeapFreeRatio=10", | |
59 "-XX:MaxHeapFreeRatio=11", | |
60 "-XX:+UseG1GC", | |
61 "-XX:G1HeapRegionSize=" + REGION_SIZE, | |
62 "-verbose:gc", | |
63 GCTest.class.getName() | |
64 ); | |
65 | |
66 OutputAnalyzer output = ProcessTools.executeProcess(pb); | |
67 output.shouldHaveExitValue(0); | |
68 } | |
69 | |
70 static class GCTest { | |
71 | |
72 private static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio"; | |
73 private static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio"; | |
74 private static final String NEW_SIZE_FLAG_NAME = "NewSize"; | |
75 | |
76 private static final ArrayList<ArrayList<byte[]>> garbage = new ArrayList<>(); | |
77 | |
78 private static final int SMALL_OBJS_SIZE = 10 * 1024; // 10kB | |
79 private static final int SMALL_OBJS_COUNT = MINIMAL_YOUNG_SIZE / (SMALL_OBJS_SIZE-1); | |
80 private static final int ALLOCATE_COUNT = 3; | |
81 // try to put all humongous object into gap between min young size and initial heap size | |
82 // to avoid implicit GCs | |
83 private static final int HUMONG_OBJS_SIZE = (int) Math.max( | |
84 (INITIAL_HEAP_SIZE - MINIMAL_YOUNG_SIZE) / ALLOCATE_COUNT / 4, | |
85 REGION_SIZE * 1.1 | |
86 ); | |
87 | |
88 private static final long initialHeapSize = getHeapMemoryUsage().getUsed(); | |
89 | |
90 public static void main(String[] args) throws InterruptedException { | |
91 new GCTest().test(); | |
92 } | |
93 | |
94 private void test() throws InterruptedException { | |
95 MemoryUsagePrinter.printMemoryUsage("init"); | |
96 | |
97 allocate(); | |
98 System.gc(); | |
99 MemoryUsage muFull = getHeapMemoryUsage(); | |
100 MemoryUsagePrinter.printMemoryUsage("allocated"); | |
101 | |
102 free(); | |
103 //Thread.sleep(1000); // sleep before measures due lags in JMX | |
104 MemoryUsage muFree = getHeapMemoryUsage(); | |
105 MemoryUsagePrinter.printMemoryUsage("free"); | |
106 | |
107 assertLessThan(muFree.getCommitted(), muFull.getCommitted(), prepareMessageCommittedIsNotLess() ); | |
108 } | |
109 | |
110 private void allocate() { | |
111 System.out.format("Will allocate objects of small size = %s and humongous size = %s", | |
112 MemoryUsagePrinter.humanReadableByteCount(SMALL_OBJS_SIZE, false), | |
113 MemoryUsagePrinter.humanReadableByteCount(HUMONG_OBJS_SIZE, false) | |
114 ); | |
115 | |
116 for (int i = 0; i < ALLOCATE_COUNT; i++) { | |
117 ArrayList<byte[]> stuff = new ArrayList<>(); | |
118 allocateList(stuff, SMALL_OBJS_COUNT / ALLOCATE_COUNT, SMALL_OBJS_SIZE); | |
119 garbage.add(stuff); | |
120 | |
121 ArrayList<byte[]> humongousStuff = new ArrayList<>(); | |
122 allocateList(humongousStuff, 4, HUMONG_OBJS_SIZE); | |
123 garbage.add(humongousStuff); | |
124 } | |
125 } | |
126 | |
127 private void free() { | |
128 // do not free last one list | |
129 garbage.subList(0, garbage.size() - 1).clear(); | |
130 | |
131 // do not free last one element from last list | |
132 ArrayList stuff = garbage.get(garbage.size() - 1); | |
133 if (stuff.size() > 1) { | |
134 stuff.subList(0, stuff.size() - 1).clear(); | |
135 } | |
136 System.gc(); | |
137 } | |
138 | |
139 private String prepareMessageCommittedIsNotLess() { | |
140 return String.format( | |
141 "committed free heap size is not less than committed full heap size, heap hasn't been shrunk?%n" | |
142 + "%s = %s%n%s = %s", | |
143 MIN_FREE_RATIO_FLAG_NAME, | |
144 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MIN_FREE_RATIO_FLAG_NAME).getValue(), | |
145 MAX_FREE_RATIO_FLAG_NAME, | |
146 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue() | |
147 ); | |
148 } | |
149 | |
150 private static void allocateList(List garbage, int count, int size) { | |
151 for (int i = 0; i < count; i++) { | |
152 garbage.add(new byte[size]); | |
153 } | |
154 } | |
155 } | |
156 | |
157 static MemoryUsage getHeapMemoryUsage() { | |
158 return ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); | |
159 } | |
160 | |
161 /** | |
162 * Prints memory usage to standard output | |
163 */ | |
164 static class MemoryUsagePrinter { | |
165 | |
166 public static String humanReadableByteCount(long bytes, boolean si) { | |
167 int unit = si ? 1000 : 1024; | |
168 if (bytes < unit) { | |
169 return bytes + " B"; | |
170 } | |
171 int exp = (int) (Math.log(bytes) / Math.log(unit)); | |
172 String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i"); | |
173 return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre); | |
174 } | |
175 | |
176 public static void printMemoryUsage(String label) { | |
177 MemoryUsage memusage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); | |
178 float freeratio = 1f - (float) memusage.getUsed() / memusage.getCommitted(); | |
179 System.out.format("[%-24s] init: %-7s, used: %-7s, comm: %-7s, freeRatio ~= %.1f%%%n", | |
180 label, | |
181 humanReadableByteCount(memusage.getInit(), false), | |
182 humanReadableByteCount(memusage.getUsed(), false), | |
183 humanReadableByteCount(memusage.getCommitted(), false), | |
184 freeratio * 100 | |
185 ); | |
186 } | |
187 } | |
188 } |