1 /*
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 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 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
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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
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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 }