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 }