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    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).