1 Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved. 2 3 Redistribution and use in source and binary forms, with or without 4 modification, are permitted provided that the following conditions 5 are met: 6 7 - Redistributions of source code must retain the above copyright 8 notice, this list of conditions and the following disclaimer. 9 10 - Redistributions in binary form must reproduce the above copyright 11 notice, this list of conditions and the following disclaimer in the 12 documentation and/or other materials provided with the distribution. 13 14 - Neither the name of Oracle nor the names of its 15 contributors may be used to endorse or promote products derived 16 from this software without specific prior written permission. 17 18 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 19 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 22 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 25 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 26 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 27 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 31 Header for -agentlib:hprof (or -Xrunhprof) ASCII Output (JDK 5.0 JVMTI based) 32 33 WARNING! This file format is under development, and is subject to 34 change without notice. 35 36 This file contains the following types of records: 37 38 THREAD START 39 THREAD END mark the lifetime of Java threads 40 41 TRACE represents a Java stack trace. Each trace consists 42 of a series of stack frames. Other records refer to 43 TRACEs to identify (1) where object allocations have 44 taken place, (2) the frames in which GC roots were 45 found, and (3) frequently executed methods. 46 47 HEAP DUMP is a complete snapshot of all live objects in the Java 48 heap. Following distinctions are made: 49 50 ROOT root set as determined by GC 51 CLS classes 52 OBJ instances 53 ARR arrays 54 55 SITES is a sorted list of allocation sites. This identifies 56 the most heavily allocated object types, and the TRACE 57 at which those allocations occurred. 58 59 CPU SAMPLES is a statistical profile of program execution. The VM 60 periodically samples all running threads, and assigns 61 a quantum to active TRACEs in those threads. Entries 62 in this record are TRACEs ranked by the percentage of 63 total quanta they consumed; top-ranked TRACEs are 64 typically hot spots in the program. 65 66 CPU TIME is a profile of program execution obtained by measuring 67 the time spent in individual methods (excluding the time 68 spent in callees), as well as by counting the number of 69 times each method is called. Entries in this record are 70 TRACEs ranked by the percentage of total CPU time. The 71 "count" field indicates the number of times each TRACE 72 is invoked. 73 74 MONITOR TIME is a profile of monitor contention obtained by measuring 75 the time spent by a thread waiting to enter a monitor. 76 Entries in this record are TRACEs ranked by the percentage 77 of total monitor contention time and a brief description 78 of the monitor. The "count" field indicates the number of 79 times the monitor was contended at that TRACE. 80 81 MONITOR DUMP is a complete snapshot of all the monitors and threads in 82 the System. 83 84 HEAP DUMP, SITES, CPU SAMPLES|TIME and MONITOR DUMP|TIME records are generated 85 at program exit. They can also be obtained during program execution by typing 86 Ctrl-\ (on Solaris) or by typing Ctrl-Break (on Win32). 87
