1 /*
2 * Copyright (c) 2015, 2016, 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 TestNewSizeThreadIncrease
26 * @key gc
27 * @bug 8144527
28 * @summary Tests argument processing for NewSizeThreadIncrease
29 * @library /test/lib
30 * @requires vm.gc.Serial
31 * @modules java.base/jdk.internal.misc
32 * java.management
33 */
34
35
36 import jdk.test.lib.Platform;
37 import jdk.test.lib.process.OutputAnalyzer;
38 import jdk.test.lib.process.ProcessTools;
39
40
41 // Range of NewSizeThreadIncrease is 0 ~ max_uintx.
42 // Total of 5 threads will be created (1 GCTest thread and 4 TestThread).
43 public class TestNewSizeThreadIncrease {
44 static final String VALID_VALUE = "2097152"; // 2MB
45
46 // This value will make an overflow of 'thread count * NewSizeThreadIncrease' at DefNewGeneration::compute_new_size().
47 // = (max_uintx / 5) + 1, = (18446744073709551615 / 5) + 1
48 static String INVALID_VALUE_1 = "3689348814741910324";
49
50 // This string is contained when compute_new_size() expands or shrinks.
51 static final String LOG_NEWSIZE_CHANGED = "New generation size ";
52
53 public static void main(String[] args) throws Exception {
54 if (Platform.is32bit()) {
55 // (max_uintx / 5) + 1, 4294967295/5 + 1
56 INVALID_VALUE_1 = "858993460";
57 }
58
59 // New size will be applied as NewSizeThreadIncrease is small enough to expand.
60 runNewSizeThreadIncreaseTest(VALID_VALUE, true);
61
62 // New size will be ignored as 'thread count * NewSizeThreadIncrease' overflows.
63 runNewSizeThreadIncreaseTest(INVALID_VALUE_1, false);
64 }
65
66 static void runNewSizeThreadIncreaseTest(String expectedValue, boolean isNewsizeChanged) throws Exception {
67 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseSerialGC",
68 "-Xms96M",
69 "-Xmx128M",
70 "-XX:NewRatio=2",
71 "-Xlog:gc+heap+ergo=debug",
72 "-XX:NewSizeThreadIncrease="+expectedValue,
73 GCTest.class.getName());
74 OutputAnalyzer output = new OutputAnalyzer(pb.start());
75
76 output.shouldHaveExitValue(0);
77
78 if (isNewsizeChanged) {
79 output.shouldContain(LOG_NEWSIZE_CHANGED);
80 } else {
81 output.shouldNotContain(LOG_NEWSIZE_CHANGED);
82 }
83 }
84
85 static class GCTest {
86
87 static final int MAX_THREADS_COUNT = 4;
88 static TestThread threads[] = new TestThread[MAX_THREADS_COUNT];
89
90 public static void main(String[] args) {
91
92 System.out.println("Creating garbage");
93
94 for (int i=0; i<MAX_THREADS_COUNT; i++) {
95 threads[i] = new TestThread();
96 threads[i].start();
97 }
98
99 System.gc();
100
101 for (int i=0; i<MAX_THREADS_COUNT; i++) {
102 threads[i].stopRunning();
103 }
104
105 System.out.println("Done");
106 }
107
108 private static class TestThread extends Thread {
109
110 volatile boolean isRunning = true;
111
112 public void run() {
113 while (isRunning == true) {
114 try {
115 Thread.sleep(10);
116 } catch (Throwable t) {
117 }
118 }
119 }
120
121 public void stopRunning() {
122 isRunning = false;
123 }
124 }
125 }
126 }