1 /* 2 * Copyright (c) 2015, 2018, 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 * @summary Test checks output displayed with jstat -gc. 27 * Test scenario: 28 * test forces debuggee application eat ~70% of heap and runs jstat. 29 * jstat should show actual usage of old gen (OC/OU ~= old gen usage). 30 * @requires vm.opt.ExplicitGCInvokesConcurrent != true 31 * @requires vm.gc != "Z" 32 * @modules java.base/jdk.internal.misc 33 * @library /test/lib 34 * @library ../share 35 * @build sun.hotspot.WhiteBox 36 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 37 * sun.hotspot.WhiteBox$WhiteBoxPermission 38 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI 39 -XX:+UsePerfData -XX:MaxNewSize=4m -XX:MaxHeapSize=128M -XX:MaxMetaspaceSize=128M GcTest02 40 */ 41 import utils.*; 42 import sun.hotspot.WhiteBox; 43 44 public class GcTest02 { 45 46 public static void main(String[] args) throws Exception { 47 WhiteBox wb = WhiteBox.getWhiteBox(); 48 // This test produces more than 90_000 classes until it eats up ~70% of the 128M meta space. 49 // The loading of each of these classes triggers a full dependency check for ALL nmethods 50 // in debug/fastdebug builds because 'VerifyDependencies' is 'true' there. This slows down the 51 // test from about 3 sec. in the opt to about 88 sec. in the fastdebug build on x86_64 and from 52 // about 4 sec. to about 560 sec. on ppc64. 53 // Because this test is not about dependency checking, it makes sense to switch of 54 // 'VerifyDependencies' if it is run inside a debug/fastdebug VM and decrease the execution time 55 // down to about 6 sec. on both x86_64 and ppc64. 56 if (!wb.isConstantVMFlag("VerifyDependencies")) { 57 // "VerifyDependencies" is a "development" flag (i.e. it is constant in a product build) so 58 // '!wb.isConstantVMFlag("VerifyDependencies")' means that we run inside a debug/fastdebug VM. 59 wb.setBooleanVMFlag("VerifyDependencies", false); 60 } 61 new GarbageProducerTest(new JstatGcTool(ProcessHandle.current().pid())).run(); 62 } 63 }