1 /*
   2  * Copyright (c) 2004, 2011, 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 4990825
  27  * @run main/othervm -XX:+UsePerfData  PrologSizeSanityCheck
  28  * @summary prolog size and overflow sanity checks
  29  */
  30 
  31 import sun.jvmstat.monitor.*;
  32 
  33 public class PrologSizeSanityCheck {
  34 
  35     private static final String sizeName = "sun.perfdata.size";
  36     private static final String usedName = "sun.perfdata.used";
  37     private static final String overflowName = "sun.perfdata.overflow";
  38     private static final int K = 1024;
  39 
  40     public static void main(String args[]) throws Exception {
  41 
  42         VmIdentifier vmid = new VmIdentifier("0");
  43         MonitoredHost localhost = MonitoredHost.getMonitoredHost("localhost");
  44         MonitoredVm self = localhost.getMonitoredVm(vmid);
  45 
  46         IntegerMonitor prologSize = (IntegerMonitor)self.findByName(sizeName);
  47         IntegerMonitor prologUsed = (IntegerMonitor)self.findByName(usedName);
  48         IntegerMonitor prologOverflow =
  49                 (IntegerMonitor)self.findByName(overflowName);
  50 
  51         if (prologOverflow.intValue() != 0) {
  52             throw new RuntimeException("jvmstat memory buffer overflow: "
  53                     + sizeName + "=" + prologSize.intValue()
  54                     + usedName + "=" + prologUsed.intValue()
  55                     + overflowName + "=" + prologOverflow.intValue()
  56                     + " : PerfDataMemorySize must be increased");
  57         }
  58 
  59         if (prologUsed.intValue() + 3*K >= prologSize.intValue()) {
  60           /*
  61            * we want to leave at least 3K of space to allow for long
  62            * string names in the various path oriented strings and for
  63            * the command line argument and vm argument strings. 3K is
  64            * somewhat of an arbitrary figure, but it is based on failure
  65            * scenarios observed in SQE when jvmstat was originally
  66            * introduced in 1.4.1.
  67            */
  68             throw new RuntimeException(
  69                    "jvmstat memory buffer usage approaching size: "
  70                     + sizeName + "=" + prologSize.intValue()
  71                     + usedName + "=" + prologUsed.intValue()
  72                     + " : consider increasing PerfDataMemorySize");
  73         }
  74     }
  75 }