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