1 /*
2 * Copyright (c) 2013, 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 TestSummarizeRSetStats.java
26 * @bug 8013895
27 * @library /testlibrary
28 * @build TestSummarizeRSetStats
29 * @summary Verify output of -XX:+G1SummarizeRSetStats
30 * @run main TestSummarizeRSetStats
31 *
32 * Test the output of G1SummarizeRSetStats in conjunction with G1SummarizeRSetStatsPeriod.
33 */
34
35 import com.oracle.java.testlibrary.*;
36 import java.lang.Thread;
37 import java.util.ArrayList;
38 import java.util.Arrays;
39
40 class RunSystemGCs {
41 // 4M size, both are directly allocated into the old gen
42 static Object[] largeObject1 = new Object[1024 * 1024];
43 static Object[] largeObject2 = new Object[1024 * 1024];
44
45 static int[] temp;
46
47 public static void main(String[] args) {
48 // create some cross-references between these objects
49 for (int i = 0; i < largeObject1.length; i++) {
50 largeObject1[i] = largeObject2;
51 }
52
53 for (int i = 0; i < largeObject2.length; i++) {
54 largeObject2[i] = largeObject1;
55 }
56
57 int numGCs = Integer.parseInt(args[0]);
58
59 if (numGCs > 0) {
60 // try to force a minor collection: the young gen is 4M, the
61 // amount of data allocated below is roughly that (4*1024*1024 +
62 // some header data)
63 for (int i = 0; i < 1024 ; i++) {
64 temp = new int[1024];
65 }
66 }
67
68 for (int i = 0; i < numGCs - 1; i++) {
69 System.gc();
70 }
71 }
72 }
73
74 public class TestSummarizeRSetStats {
75
76 public static String runTest(String[] additionalArgs, int numGCs) throws Exception {
77 ArrayList<String> finalargs = new ArrayList<String>();
78 String[] defaultArgs = new String[] {
79 "-XX:+UseG1GC",
80 "-Xmn4m",
81 "-Xmx20m",
82 "-XX:InitiatingHeapOccupancyPercent=100", // we don't want the additional GCs due to initial marking
83 "-XX:+PrintGC",
84 "-XX:+UnlockDiagnosticVMOptions",
85 "-XX:G1HeapRegionSize=1M",
86 };
87
88 finalargs.addAll(Arrays.asList(defaultArgs));
89
90 if (additionalArgs != null) {
91 finalargs.addAll(Arrays.asList(additionalArgs));
92 }
93
94 finalargs.add(RunSystemGCs.class.getName());
95 finalargs.add(String.valueOf(numGCs));
96
97 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
98 finalargs.toArray(new String[0]));
99 OutputAnalyzer output = new OutputAnalyzer(pb.start());
100
101 output.shouldHaveExitValue(0);
102
103 String result = output.getStdout();
104 return result;
105 }
106
107 private static void expectStatistics(String result, int expectedCumulative, int expectedPeriodic) throws Exception {
108 int actualTotal = result.split("Concurrent RS processed").length - 1;
109 int actualCumulative = result.split("Cumulative RS summary").length - 1;
110
111 if (expectedCumulative != actualCumulative) {
112 throw new Exception("Incorrect amount of RSet summaries at the end. Expected " + expectedCumulative + ", got " + actualCumulative);
113 }
114
115 if (expectedPeriodic != (actualTotal - actualCumulative)) {
116 throw new Exception("Incorrect amount of per-period RSet summaries at the end. Expected " + expectedPeriodic + ", got " + (actualTotal - actualCumulative));
117 }
118 }
119
120 public static void main(String[] args) throws Exception {
121 String result;
122
123 // no RSet statistics output
124 result = runTest(null, 0);
125 expectStatistics(result, 0, 0);
126
127 // no RSet statistics output
128 result = runTest(null, 2);
129 expectStatistics(result, 0, 0);
130
131 // no RSet statistics output
132 result = runTest(new String[] { "-XX:G1SummarizeRSetStatsPeriod=1" }, 3);
133 expectStatistics(result, 0, 0);
134
135 // single RSet statistics output at the end
136 result = runTest(new String[] { "-XX:+G1SummarizeRSetStats" }, 0);
137 expectStatistics(result, 1, 0);
138
139 // single RSet statistics output at the end
140 result = runTest(new String[] { "-XX:+G1SummarizeRSetStats" }, 2);
141 expectStatistics(result, 1, 0);
142
143 // single RSet statistics output
144 result = runTest(new String[] { "-XX:+G1SummarizeRSetStats", "-XX:G1SummarizeRSetStatsPeriod=1" }, 0);
145 expectStatistics(result, 1, 0);
146
147 // two times RSet statistics output
148 result = runTest(new String[] { "-XX:+G1SummarizeRSetStats", "-XX:G1SummarizeRSetStatsPeriod=1" }, 1);
149 expectStatistics(result, 1, 1);
150
151 // four times RSet statistics output
152 result = runTest(new String[] { "-XX:+G1SummarizeRSetStats", "-XX:G1SummarizeRSetStatsPeriod=1" }, 3);
153 expectStatistics(result, 1, 3);
154
155 // three times RSet statistics output
156 result = runTest(new String[] { "-XX:+G1SummarizeRSetStats", "-XX:G1SummarizeRSetStatsPeriod=2" }, 3);
157 expectStatistics(result, 1, 2);
158
159 // single RSet statistics output
160 result = runTest(new String[] { "-XX:+G1SummarizeRSetStats", "-XX:G1SummarizeRSetStatsPeriod=100" }, 3);
161 expectStatistics(result, 1, 1);
162 }
163 }
164