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 // Sizes beyond this will be rejected by hotspot arg parsing 42 // (Lilliput: see Metaspace::max_class_space_size() for details) 43 static final long max_class_space_size = 2013265920; 44 45 // Below this size class space will be silently enlarged to a multiple of this size 46 static final long min_class_space_size = 4194304; 47 48 public static void main(String[] args) throws Exception { 49 ProcessBuilder pb; 50 OutputAnalyzer output; 51 52 // Invalid size of -1 should be handled correctly 53 pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=-1", 54 "-version"); 55 output = new OutputAnalyzer(pb.start()); 56 output.shouldContain("Improperly specified VM option 'CompressedClassSpaceSize=-1'") 57 .shouldHaveExitValue(1); 58 59 /////////// 60 61 // Going below the minimum size for class space (one root chunk size = atm 4M) should be transparently 62 // handled by the hotspot, which should round up class space size and not report an error. 63 pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=1m", 64 "-Xlog:gc+metaspace=trace", 65 "-version"); 66 output = new OutputAnalyzer(pb.start()); 67 output.shouldMatch("Compressed class space.*" + min_class_space_size) 68 .shouldHaveExitValue(0); 69 70 /////////// 71 72 // Try 0. Same result expected. 73 pb = ProcessTools.createJavaProcessBuilder("-XX:CompressedClassSpaceSize=0", 74 "-Xlog:gc+metaspace=trace", 75 "-version"); 76 output = new OutputAnalyzer(pb.start()); 77 output.shouldMatch("Compressed class space.*" + min_class_space_size) 78 .shouldHaveExitValue(0); 79 80 /////////// 81 82 // Try max allowed size, which should be accepted 83 pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions", 84 "-XX:CompressedClassSpaceSize=" + max_class_space_size, 85 "-Xlog:gc+metaspace=trace", 86 "-version"); 87 output = new OutputAnalyzer(pb.start()); 88 output.shouldMatch("Compressed class space.*" + max_class_space_size) 89 .shouldHaveExitValue(0); 90 91 /////////// 92 93 // Set max allowed size + 1, which should graciously fail 94 pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions", 95 "-XX:CompressedClassSpaceSize=" + (max_class_space_size + 1), 96 "-Xlog:gc+metaspace=trace", 97 "-version"); 98 output = new OutputAnalyzer(pb.start()); 99 output.shouldContain("CompressedClassSpaceSize " + (max_class_space_size + 1) + " too large (max: " + max_class_space_size) 100 .shouldHaveExitValue(1); 101 102 } 103 }