author | chegar |
Thu, 17 Oct 2019 20:54:25 +0100 | |
branch | datagramsocketimpl-branch |
changeset 58679 | 9c3209ff7550 |
parent 58678 | 9cf78a70fa4f |
parent 58263 | 4fbc534fdf69 |
permissions | -rw-r--r-- |
51877 | 1 |
/* |
53536
482109fae02b
8213229: Investigate treating StringTable as weak in young collections
tschatzl
parents:
51877
diff
changeset
|
2 |
* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved. |
51877 | 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. Oracle designates this |
|
8 |
* particular file as subject to the "Classpath" exception as provided |
|
9 |
* by Oracle in the LICENSE file that accompanied this code. |
|
10 |
* |
|
11 |
* This code is distributed in the hope that it will be useful, but WITHOUT |
|
12 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
13 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
14 |
* version 2 for more details (a copy is included in the LICENSE file that |
|
15 |
* accompanied this code). |
|
16 |
* |
|
17 |
* You should have received a copy of the GNU General Public License version |
|
18 |
* 2 along with this work; if not, write to the Free Software Foundation, |
|
19 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
20 |
* |
|
21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
22 |
* or visit www.oracle.com if you need additional information or have any |
|
23 |
* questions. |
|
24 |
*/ |
|
25 |
||
26 |
package jdk.jfr.event.gc.collection; |
|
27 |
||
28 |
import static java.lang.System.gc; |
|
29 |
import static java.lang.Thread.sleep; |
|
30 |
import static java.util.Set.of; |
|
31 |
import static java.util.stream.Collectors.joining; |
|
32 |
import static java.util.stream.Collectors.toList; |
|
33 |
import static java.util.stream.Collectors.toSet; |
|
34 |
import static java.util.stream.IntStream.range; |
|
35 |
import static jdk.jfr.event.gc.collection.Provoker.provokeMixedGC; |
|
36 |
import static jdk.test.lib.Asserts.assertEquals; |
|
37 |
import static jdk.test.lib.Asserts.assertTrue; |
|
38 |
import static jdk.test.lib.jfr.Events.fromRecording; |
|
39 |
import static sun.hotspot.WhiteBox.getWhiteBox; |
|
40 |
||
41 |
import java.io.IOException; |
|
42 |
import java.lang.ref.WeakReference; |
|
43 |
import java.math.BigDecimal; |
|
44 |
import java.util.ArrayList; |
|
45 |
import java.util.Collection; |
|
46 |
import java.util.List; |
|
47 |
import java.util.Set; |
|
48 |
||
49 |
import jdk.jfr.Recording; |
|
50 |
import jdk.test.lib.Asserts; |
|
51 |
import jdk.test.lib.jfr.EventNames; |
|
52 |
import sun.hotspot.WhiteBox; |
|
53 |
||
54 |
/** |
|
55 |
* @test |
|
56 |
* @key jfr |
|
57 |
* @requires vm.hasJFR |
|
58 |
* @requires vm.gc == "G1" | vm.gc == null |
|
59 |
* @library /test/lib /test/jdk |
|
60 |
* @build sun.hotspot.WhiteBox |
|
61 |
* @run main ClassFileInstaller sun.hotspot.WhiteBox |
|
62 |
* @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:MaxTenuringThreshold=1 -Xms20M -Xmx20M |
|
63 |
* -XX:G1MixedGCLiveThresholdPercent=100 -XX:G1HeapWastePercent=0 -XX:G1HeapRegionSize=1m |
|
64 |
* -XX:+UseG1GC -XX:+UseStringDeduplication |
|
65 |
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI |
|
66 |
* jdk.jfr.event.gc.collection.TestG1ParallelPhases |
|
67 |
*/ |
|
68 |
||
69 |
public class TestG1ParallelPhases { |
|
70 |
public static List<WeakReference<byte[]>> weakRefs; |
|
71 |
||
72 |
public static void main(String[] args) throws IOException { |
|
73 |
Recording recording = new Recording(); |
|
74 |
recording.enable(EventNames.GCPhaseParallel); |
|
75 |
recording.start(); |
|
76 |
||
77 |
// create more weak garbage than can fit in this heap (-Xmx20m), will force collection of weak references |
|
78 |
weakRefs = range(1, 100) |
|
79 |
.mapToObj(n -> new WeakReference<>(new byte[1_000_000])) |
|
80 |
.collect(toList()); // force evaluation of lazy stream (all weak refs must be created) |
|
81 |
||
82 |
final var MEG = 1024 * 1024; |
|
83 |
provokeMixedGC(1 * MEG); |
|
84 |
recording.stop(); |
|
85 |
||
86 |
Set<String> usedPhases = fromRecording(recording).stream() |
|
87 |
.map(e -> e.getValue("name").toString()) |
|
88 |
.collect(toSet()); |
|
89 |
||
90 |
Set<String> allPhases = of( |
|
91 |
"ExtRootScan", |
|
92 |
"ThreadRoots", |
|
93 |
"UniverseRoots", |
|
94 |
"JNIRoots", |
|
95 |
"ObjectSynchronizerRoots", |
|
96 |
"ManagementRoots", |
|
97 |
"SystemDictionaryRoots", |
|
98 |
"CLDGRoots", |
|
99 |
"JVMTIRoots", |
|
100 |
"CMRefRoots", |
|
58263
4fbc534fdf69
8159984: Remove call to ClassLoaderDataGraph::clear_claimed_marks during the initial mark pause
tschatzl
parents:
55723
diff
changeset
|
101 |
"WaitForStrongRoots", |
55723
95706898c3ea
8227089: Add timing information for merging humongous remembered sets
tschatzl
parents:
55510
diff
changeset
|
102 |
"MergeER", |
55510
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
103 |
"MergeHCC", |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
104 |
"MergeRS", |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
105 |
"MergeLB", |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
106 |
"ScanHR", |
51877 | 107 |
"CodeRoots", |
108 |
"ObjCopy", |
|
109 |
"Termination", |
|
110 |
"StringDedupQueueFixup", |
|
111 |
"StringDedupTableFixup", |
|
112 |
"RedirtyCards", |
|
113 |
"NonYoungFreeCSet", |
|
114 |
"YoungFreeCSet" |
|
115 |
); |
|
116 |
||
55510
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
117 |
// Some GC phases may or may not occur depending on environment. Filter them out |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
118 |
// since we can not reliably guarantee that they occur (or not). |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
119 |
Set<String> optPhases = of( |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
120 |
"OptScanHR", |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
121 |
"OptMergeRS", |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
122 |
"OptCodeRoots", |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
123 |
"OptObjCopy" |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
124 |
); |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
125 |
usedPhases.removeAll(optPhases); |
3e31a8beaae4
8213108: Improve work distribution during remembered set scan
tschatzl
parents:
54715
diff
changeset
|
126 |
|
51877 | 127 |
assertTrue(usedPhases.equals(allPhases), "Compare events expected and received" |
128 |
+ ", Not found phases: " + allPhases.stream().filter(p -> !usedPhases.contains(p)).collect(joining(", ")) |
|
129 |
+ ", Not expected phases: " + usedPhases.stream().filter(p -> !allPhases.contains(p)).collect(joining(", "))); |
|
130 |
} |
|
131 |
} |
|
132 |
||
133 |
/** |
|
134 |
* Utility class to guarantee a mixed GC. The class allocates several arrays and |
|
135 |
* promotes them to the oldgen. After that it tries to provoke mixed GC by |
|
136 |
* allocating new objects. |
|
137 |
*/ |
|
138 |
class Provoker { |
|
139 |
private static void allocateOldObjects( |
|
140 |
List<byte[]> liveOldObjects, |
|
141 |
int g1HeapRegionSize, |
|
142 |
int arraySize) { |
|
143 |
||
144 |
var toUnreachable = new ArrayList<byte[]>(); |
|
145 |
||
146 |
// Allocates buffer and promotes it to the old gen. Mix live and dead old objects. |
|
147 |
// allocate about two regions of old memory. At least one full old region will guarantee |
|
148 |
// mixed collection in the future |
|
149 |
range(0, g1HeapRegionSize/arraySize).forEach(n -> { |
|
150 |
liveOldObjects.add(new byte[arraySize]); |
|
151 |
toUnreachable.add(new byte[arraySize]); |
|
152 |
}); |
|
153 |
||
154 |
// Do two young collections, MaxTenuringThreshold=1 will force promotion. |
|
155 |
getWhiteBox().youngGC(); |
|
156 |
getWhiteBox().youngGC(); |
|
157 |
||
158 |
// Check it is promoted & keep alive |
|
159 |
Asserts.assertTrue(getWhiteBox().isObjectInOldGen(liveOldObjects), "List of the objects is suppose to be in OldGen"); |
|
160 |
Asserts.assertTrue(getWhiteBox().isObjectInOldGen(toUnreachable), "List of the objects is suppose to be in OldGen"); |
|
161 |
} |
|
162 |
||
163 |
private static void waitTillCMCFinished(int sleepTime) { |
|
164 |
while (getWhiteBox().g1InConcurrentMark()) { |
|
165 |
try {sleep(sleepTime);} catch (Exception e) {} |
|
166 |
} |
|
167 |
} |
|
168 |
||
169 |
/** |
|
170 |
* The necessary condition for guaranteed mixed GC is running in VM with the following flags: |
|
171 |
* -XX:+UnlockExperimentalVMOptions -XX:MaxTenuringThreshold=1 -Xms{HEAP_SIZE}M |
|
172 |
* -Xmx{HEAP_SIZE}M -XX:G1MixedGCLiveThresholdPercent=100 -XX:G1HeapWastePercent=0 |
|
173 |
* -XX:G1HeapRegionSize={REGION_SIZE}m |
|
174 |
* |
|
175 |
* @param provokeSize The size to allocate to provoke the start of a mixed gc (half heap size?) |
|
176 |
* @param g1HeapRegionSize The size of your regions in bytes |
|
177 |
*/ |
|
178 |
public static void provokeMixedGC(int g1HeapRegionSize) { |
|
179 |
final var arraySize = 20_000; |
|
180 |
var liveOldObjects = new ArrayList<byte[]>(); |
|
181 |
allocateOldObjects(liveOldObjects, g1HeapRegionSize, arraySize); |
|
182 |
waitTillCMCFinished(10); |
|
183 |
getWhiteBox().g1StartConcMarkCycle(); |
|
184 |
waitTillCMCFinished(10); |
|
185 |
getWhiteBox().youngGC(); |
|
186 |
getWhiteBox().youngGC(); |
|
187 |
||
188 |
// check that liveOldObjects still alive |
|
189 |
assertTrue(getWhiteBox().isObjectInOldGen(liveOldObjects), "List of the objects is suppose to be in OldGen"); |
|
190 |
} |
|
191 |
} |