1 /*
2 * Copyright (c) 2014, 2021, 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
26 * @bug 8022865
27 * @summary Tests for the -XX:CompressedClassSpaceSize command line option
28 * @requires vm.bits == 64 & vm.opt.final.UseCompressedOops == true
29 * @requires vm.flagless
30 * @library /test/lib
31 * @modules java.base/jdk.internal.misc
32 * java.management
33 * @run driver CompressedClassSpaceSize
34 */
35
36 import jdk.test.lib.process.ProcessTools;
37 import jdk.test.lib.process.OutputAnalyzer;
38
39 public class CompressedClassSpaceSize {
40
41 public static void main(String[] args) throws Exception {
42 ProcessBuilder pb;
43 OutputAnalyzer output;
44 // Minimum size is 1MB
45 pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=0",
46 "-version");
47 output = new OutputAnalyzer(pb.start());
48 output.shouldContain("outside the allowed range")
49 .shouldHaveExitValue(1);
50
51 // Invalid size of -1 should be handled correctly
52 pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=-1",
53 "-version");
54 output = new OutputAnalyzer(pb.start());
55 output.shouldContain("Improperly specified VM option 'CompressedClassSpaceSize=-1'")
56 .shouldHaveExitValue(1);
57
58
59 // Maximum size is 3GB
60 pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=4g",
61 "-version");
62 output = new OutputAnalyzer(pb.start());
63 output.shouldContain("outside the allowed range")
64 .shouldHaveExitValue(1);
65
66
67 // Make sure the minimum size is set correctly and printed
68 // (Note: ccs size shall be rounded up to the minimum size of 4m since metaspace reservations
69 // are done in a 4m granularity. Note that this is **reserved** size and does not affect rss.
70 pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
71 "-XX:CompressedClassSpaceSize=1m",
72 "-Xlog:gc+metaspace=trace",
73 "-version");
74 output = new OutputAnalyzer(pb.start());
75 output.shouldMatch("Compressed class space.*4194304")
76 .shouldHaveExitValue(0);
77
78
79 // Make sure the maximum size is set correctly and printed
80 pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
81 "-XX:CompressedClassSpaceSize=3g",
82 "-Xlog:gc+metaspace=trace",
83 "-version");
84 output = new OutputAnalyzer(pb.start());
85 output.shouldMatch("Compressed class space.*3221225472")
86 .shouldHaveExitValue(0);
87
88
89 pb = ProcessTools.createJavaProcessBuilder("-XX:-UseCompressedClassPointers",
90 "-XX:CompressedClassSpaceSize=1m",
91 "-version");
92 output = new OutputAnalyzer(pb.start());
93 output.shouldContain("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used")
94 .shouldHaveExitValue(0);
95 }
96 }