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comparison: test/gc/arguments/TestMaxHeapSizeTools.java

test/gc/arguments/TestMaxHeapSizeTools.java

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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 import java.util.regex.Matcher;
25 import java.util.regex.Pattern;
26 import java.util.ArrayList;
27 import java.util.Arrays;
28
29 import com.oracle.java.testlibrary.*;
30 import sun.hotspot.WhiteBox;
31
32 class ErgoArgsPrinter {
33 public static void main(String[] args) throws Exception {
34 WhiteBox wb = WhiteBox.getWhiteBox();
35 wb.printHeapSizes();
36 }
37 }
38
39 final class MinInitialMaxValues {
40 public long minHeapSize;
41 public long initialHeapSize;
42 public long maxHeapSize;
43
44 public long minAlignment;
45 public long maxAlignment;
46 }
47
48 class TestMaxHeapSizeTools {
49
50 public static void checkMinInitialMaxHeapFlags(String gcflag) throws Exception {
51 checkInvalidMinInitialHeapCombinations(gcflag);
52 checkValidMinInitialHeapCombinations(gcflag);
53 checkInvalidInitialMaxHeapCombinations(gcflag);
54 checkValidInitialMaxHeapCombinations(gcflag);
55 }
56
57 public static void checkMinInitialErgonomics(String gcflag) throws Exception {
58 // heap sizing ergonomics use the value NewSize + OldSize as default values
59 // for ergonomics calculation. Retrieve these values.
60 long[] values = new long[2];
61 getNewOldSize(gcflag, values);
62
63 // we check cases with values smaller and larger than this default value.
64 long newPlusOldSize = values[0] + values[1];
65 long smallValue = newPlusOldSize / 2;
66 long largeValue = newPlusOldSize * 2;
67 long maxHeapSize = largeValue + (2 * 1024 * 1024);
68
69 // -Xms is not set
70 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize }, values, -1, -1);
71 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-XX:InitialHeapSize=" + smallValue }, values, -1, smallValue);
72 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-XX:InitialHeapSize=" + largeValue }, values, -1, largeValue);
73 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-XX:InitialHeapSize=0" }, values, -1, -1);
74
75 // -Xms is set to zero
76 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms0" }, values, -1, -1);
77 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms0", "-XX:InitialHeapSize=" + smallValue }, values, -1, smallValue);
78 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms0", "-XX:InitialHeapSize=" + largeValue }, values, -1, largeValue);
79 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms0", "-XX:InitialHeapSize=0" }, values, -1, -1);
80
81 // -Xms is set to small value
82 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + smallValue }, values, -1, -1);
83 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + smallValue, "-XX:InitialHeapSize=" + smallValue }, values, smallValue, smallValue);
84 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + smallValue, "-XX:InitialHeapSize=" + largeValue }, values, smallValue, largeValue);
85 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + smallValue, "-XX:InitialHeapSize=0" }, values, smallValue, -1);
86
87 // -Xms is set to large value
88 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + largeValue }, values, largeValue, largeValue);
89 checkErgonomics(new String[] { gcflag, "-Xmx" + maxHeapSize, "-Xms" + largeValue, "-XX:InitialHeapSize=0" }, values, largeValue, -1);
90 }
91
92 private static long align_up(long value, long alignment) {
93 long alignmentMinusOne = alignment - 1;
94 return (value + alignmentMinusOne) & ~alignmentMinusOne;
95 }
96
97 private static void getNewOldSize(String gcflag, long[] values) throws Exception {
98 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(gcflag,
99 "-XX:+PrintFlagsFinal", "-version");
100 OutputAnalyzer output = new OutputAnalyzer(pb.start());
101 output.shouldHaveExitValue(0);
102
103 String stdout = output.getStdout();
104 values[0] = getFlagValue(" NewSize", stdout);
105 values[1] = getFlagValue(" OldSize", stdout);
106 }
107
108 public static void checkGenMaxHeapErgo(String gcflag) throws Exception {
109 TestMaxHeapSizeTools.checkGenMaxHeapSize(gcflag, 3);
110 TestMaxHeapSizeTools.checkGenMaxHeapSize(gcflag, 4);
111 TestMaxHeapSizeTools.checkGenMaxHeapSize(gcflag, 5);
112 }
113
114 private static void checkInvalidMinInitialHeapCombinations(String gcflag) throws Exception {
115 expectError(new String[] { gcflag, "-Xms8M", "-XX:InitialHeapSize=4M", "-version" });
116 }
117
118 private static void checkValidMinInitialHeapCombinations(String gcflag) throws Exception {
119 expectValid(new String[] { gcflag, "-XX:InitialHeapSize=8M", "-Xms4M", "-version" });
120 expectValid(new String[] { gcflag, "-Xms4M", "-XX:InitialHeapSize=8M", "-version" });
121 expectValid(new String[] { gcflag, "-XX:InitialHeapSize=8M", "-Xms8M", "-version" });
122 // the following is not an error as -Xms sets both minimal and initial heap size
123 expectValid(new String[] { gcflag, "-XX:InitialHeapSize=4M", "-Xms8M", "-version" });
124 }
125
126 private static void checkInvalidInitialMaxHeapCombinations(String gcflag) throws Exception {
127 expectError(new String[] { gcflag, "-XX:MaxHeapSize=4M", "-XX:InitialHeapSize=8M", "-version" });
128 expectError(new String[] { gcflag, "-XX:InitialHeapSize=8M", "-XX:MaxHeapSize=4M", "-version" });
129 }
130
131 private static void checkValidInitialMaxHeapCombinations(String gcflag) throws Exception {
132 expectValid(new String[] { gcflag, "-XX:InitialHeapSize=4M", "-XX:MaxHeapSize=8M", "-version" });
133 expectValid(new String[] { gcflag, "-XX:MaxHeapSize=8M", "-XX:InitialHeapSize=4M", "-version" });
134 expectValid(new String[] { gcflag, "-XX:MaxHeapSize=4M", "-XX:InitialHeapSize=4M", "-version" });
135 // a value of "0" for initial heap size means auto-detect
136 expectValid(new String[] { gcflag, "-XX:MaxHeapSize=4M", "-XX:InitialHeapSize=0M", "-version" });
137 }
138
139 private static long valueAfter(String source, String match) {
140 int start = source.indexOf(match) + match.length();
141 String tail = source.substring(start).split(" ")[0];
142 return Long.parseLong(tail);
143 }
144
145 /**
146 * Executes a new VM process with the given class and parameters.
147 * @param vmargs Arguments to the VM to run
148 * @param classname Name of the class to run
149 * @param arguments Arguments to the class
150 * @param useTestDotJavaDotOpts Use test.java.opts as part of the VM argument string
151 * @return The OutputAnalyzer with the results for the invocation.
152 */
153 public static OutputAnalyzer runWhiteBoxTest(String[] vmargs, String classname, String[] arguments, boolean useTestDotJavaDotOpts) throws Exception {
154 ArrayList<String> finalargs = new ArrayList<String>();
155
156 String[] whiteboxOpts = new String[] {
157 "-Xbootclasspath/a:.",
158 "-XX:+UnlockDiagnosticVMOptions", "-XX:+WhiteBoxAPI",
159 "-cp", System.getProperty("java.class.path"),
160 };
161
162 if (useTestDotJavaDotOpts) {
163 // System.getProperty("test.java.opts") is '' if no options is set,
164 // we need to skip such a result
165 String[] externalVMOpts = new String[0];
166 if (System.getProperty("test.java.opts") != null && System.getProperty("test.java.opts").length() != 0) {
167 externalVMOpts = System.getProperty("test.java.opts").split(" ");
168 }
169 finalargs.addAll(Arrays.asList(externalVMOpts));
170 }
171
172 finalargs.addAll(Arrays.asList(vmargs));
173 finalargs.addAll(Arrays.asList(whiteboxOpts));
174 finalargs.add(classname);
175 finalargs.addAll(Arrays.asList(arguments));
176
177 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(finalargs.toArray(new String[0]));
178 OutputAnalyzer output = new OutputAnalyzer(pb.start());
179 output.shouldHaveExitValue(0);
180
181 return output;
182 }
183
184 private static void getMinInitialMaxHeap(String[] args, MinInitialMaxValues val) throws Exception {
185 OutputAnalyzer output = runWhiteBoxTest(args, ErgoArgsPrinter.class.getName(), new String[] {}, false);
186
187 // the output we watch for has the following format:
188 //
189 // "Minimum heap X Initial heap Y Maximum heap Z Min alignment A Max Alignment B"
190 //
191 // where A, B, X, Y and Z are sizes in bytes.
192 // Unfortunately there is no other way to retrieve the minimum heap size and
193 // the alignments.
194
195 Matcher m = Pattern.compile("Minimum heap \\d+ Initial heap \\d+ Maximum heap \\d+ Min alignment \\d+ Max alignment \\d+").
196 matcher(output.getStdout());
197 if (!m.find()) {
198 throw new RuntimeException("Could not find heap size string.");
199 }
200
201 String match = m.group();
202
203 // actual values
204 val.minHeapSize = valueAfter(match, "Minimum heap ");
205 val.initialHeapSize = valueAfter(match, "Initial heap ");
206 val.maxHeapSize = valueAfter(match, "Maximum heap ");
207 val.minAlignment = valueAfter(match, "Min alignment ");
208 val.maxAlignment = valueAfter(match, "Max alignment ");
209 }
210
211 /**
212 * Verify whether the VM automatically synchronizes minimum and initial heap size if only
213 * one is given for the GC specified.
214 */
215 public static void checkErgonomics(String[] args, long[] newoldsize,
216 long expectedMin, long expectedInitial) throws Exception {
217
218 MinInitialMaxValues v = new MinInitialMaxValues();
219 getMinInitialMaxHeap(args, v);
220
221 if ((expectedMin != -1) && (align_up(expectedMin, v.minAlignment) != v.minHeapSize)) {
222 throw new RuntimeException("Actual minimum heap size of " + v.minHeapSize +
223 " differs from expected minimum heap size of " + expectedMin);
224 }
225
226 if ((expectedInitial != -1) && (align_up(expectedInitial, v.minAlignment) != v.initialHeapSize)) {
227 throw new RuntimeException("Actual initial heap size of " + v.initialHeapSize +
228 " differs from expected initial heap size of " + expectedInitial);
229 }
230
231 // always check the invariant min <= initial <= max heap size
232 if (!(v.minHeapSize <= v.initialHeapSize && v.initialHeapSize <= v.maxHeapSize)) {
233 throw new RuntimeException("Inconsistent min/initial/max heap sizes, they are " +
234 v.minHeapSize + "/" + v.initialHeapSize + "/" + v.maxHeapSize);
235 }
236 }
237
238 /**
239 * Verify whether the VM respects the given maximum heap size in MB for the
240 * GC specified.
241 * @param gcflag The garbage collector to test as command line flag. E.g. -XX:+UseG1GC
242 * @param maxHeapSize the maximum heap size to verify, in MB.
243 */
244 public static void checkGenMaxHeapSize(String gcflag, long maxHeapsize) throws Exception {
245 final long K = 1024;
246
247 MinInitialMaxValues v = new MinInitialMaxValues();
248 getMinInitialMaxHeap(new String[] { gcflag, "-XX:MaxHeapSize=" + maxHeapsize + "M" }, v);
249
250 long expectedHeapSize = align_up(maxHeapsize * K * K, v.maxAlignment);
251 long actualHeapSize = v.maxHeapSize;
252
253 if (actualHeapSize > expectedHeapSize) {
254 throw new RuntimeException("Heap has " + actualHeapSize +
255 " bytes, expected to be less than " + expectedHeapSize);
256 }
257 }
258
259 private static long getFlagValue(String flag, String where) {
260 Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where);
261 if (!m.find()) {
262 throw new RuntimeException("Could not find value for flag " + flag + " in output string");
263 }
264 String match = m.group();
265 return Long.parseLong(match.substring(match.lastIndexOf(" ") + 1, match.length()));
266 }
267
268 private static void shouldContainOrNot(OutputAnalyzer output, boolean contains, String message) throws Exception {
269 if (contains) {
270 output.shouldContain(message);
271 } else {
272 output.shouldNotContain(message);
273 }
274 }
275
276 private static void expect(String[] flags, boolean hasWarning, boolean hasError, int errorcode) throws Exception {
277 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags);
278 OutputAnalyzer output = new OutputAnalyzer(pb.start());
279 shouldContainOrNot(output, hasWarning, "Warning");
280 shouldContainOrNot(output, hasError, "Error");
281 output.shouldHaveExitValue(errorcode);
282 }
283
284 private static void expectError(String[] flags) throws Exception {
285 expect(flags, false, true, 1);
286 }
287
288 private static void expectValid(String[] flags) throws Exception {
289 expect(flags, false, false, 0);
290 }
291 }
292

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