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modification, are permitted provided that the following conditions | |
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THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
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Header for -agentlib:hprof (or -Xrunhprof) ASCII Output (JDK 5.0 JVMTI based) | |
WARNING! This file format is under development, and is subject to | |
change without notice. | |
This file contains the following types of records: | |
THREAD START | |
THREAD END mark the lifetime of Java threads | |
TRACE represents a Java stack trace. Each trace consists | |
of a series of stack frames. Other records refer to | |
TRACEs to identify (1) where object allocations have | |
taken place, (2) the frames in which GC roots were | |
found, and (3) frequently executed methods. | |
HEAP DUMP is a complete snapshot of all live objects in the Java | |
heap. Following distinctions are made: | |
ROOT root set as determined by GC | |
CLS classes | |
OBJ instances | |
ARR arrays | |
SITES is a sorted list of allocation sites. This identifies | |
the most heavily allocated object types, and the TRACE | |
at which those allocations occurred. | |
CPU SAMPLES is a statistical profile of program execution. The VM | |
periodically samples all running threads, and assigns | |
a quantum to active TRACEs in those threads. Entries | |
in this record are TRACEs ranked by the percentage of | |
total quanta they consumed; top-ranked TRACEs are | |
typically hot spots in the program. | |
CPU TIME is a profile of program execution obtained by measuring | |
the time spent in individual methods (excluding the time | |
spent in callees), as well as by counting the number of | |
times each method is called. Entries in this record are | |
TRACEs ranked by the percentage of total CPU time. The | |
"count" field indicates the number of times each TRACE | |
is invoked. | |
MONITOR TIME is a profile of monitor contention obtained by measuring | |
the time spent by a thread waiting to enter a monitor. | |
Entries in this record are TRACEs ranked by the percentage | |
of total monitor contention time and a brief description | |
of the monitor. The "count" field indicates the number of | |
times the monitor was contended at that TRACE. | |
MONITOR DUMP is a complete snapshot of all the monitors and threads in | |
the System. | |
HEAP DUMP, SITES, CPU SAMPLES|TIME and MONITOR DUMP|TIME records are generated | |
at program exit. They can also be obtained during program execution by typing | |
Ctrl-\ (on Solaris) or by typing Ctrl-Break (on Win32). | |