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 }