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