JRockit R28 Flight Recorder (ex JRA)

Official documentation here:


http://download.oracle.com/docs/cd/E15289_01/doc.40/e15070/usingjfr.htm
entire PDF:
http://download.oracle.com/docs/cd/E15289_01/doc.40/e15070.pdf

interesting reading
http://blogs.oracle.com/jrockit/2010/04/jrockit_r28_ropsten_released.html


C:\bea11\user_projects\domains\osbdomain>jrcmd
576 jrockit.tools.jrcmd.JrCmd

3356 org.apache.derby.drda.NetworkServerControl start

1908 weblogic.Server



C:\bea11\user_projects\domains\osbdomain>jrcmd 1908 help
1908:
The following commands are available:
kill_management_server
start_management_server
print_object_summary
memleakserver
print_class_summary
print_codeblocks
dump_codelayout
dump_codelist
dump_codemap
print_codegenlist
print_vm_state
print_utf8pool
check_flightrecording
dump_flightrecording
stop_flightrecording
start_flightrecording
print_properties
hprofdump
print_threads
datadump_request
runsystemgc
runfinalization
heap_diagnostics
oom_diagnostics
print_exceptions
version
timestamp
command_line
sanity
verbosity
set_filename
help
print_memusage
set_vmflag
list_vmflags
For more information about a specific command use 'help '.
Parameters to commands are optional unless otherwise stated.







C:\bea11\user_projects\domains\osbdomain>jrcmd 1908 start_management_server
1908:


C:\bea11\user_projects\domains\osbdomain>jrcmd 1908 help start_flightrecording
1908:
Starts a JFR recording
name - Name of recording (string)
settings - Settings file or preset (string)
defaultrecording - Starts default recording (bool, false)
delay - Delay recording start (time, 0s)
duration - Duration of recording (time, 0s)
filename - Resulting recording filename (string)
compress - GZip-compress the resulting recording file (bool,
false)
maxage - Maximum age of buffer data (time, 0s)
maxsize - Maximum size of buffers in bytes (long, 0)



C:\bea11\user_projects\domains\osbdomain>jrcmd 1908 start_flightrecording duration=2m name=myfirstgeoosbrecording
1908:
Started recording 2



C:\bea11\user_projects\domains\osbdomain>jrcmd 1908 start_flightrecording duration=2m name=myfirstgeoosbrecording2
1908:
Started recording 3


C:\bea11\user_projects\domains\osbdomain>jrcmd 1908 check_flightrecording
1908:
Recording : id=1 name="WLDFDiagnosticImageRecording_osbdomain_AdminServer_" duration=0s dest="C:\bea11\user_projects\domains\osbdomain\servers\AdminSe
rver\logs\diagnostic_images\__tmp847859670567686703.jfr" compress=false (running)
Recording : id=2 name="myfirstgeoosbrecording" duration=120s (stopped)
Recording : id=3 name="myfirstgeoosbrecording2" duration=120s (stopped)


C:\bea11\user_projects\domains\osbdomain>jrcmd 1908 help dump_flightrecording
1908:
Copies contents of a JFR recording to file
name - Recording name (string)
recording - Recording id (long, -1)
copy_to_file - Copy recording data to file (string)
compress_copy - GZip-compress "copy_to_file" destination (bool, false)



C:\bea11\user_projects\domains\osbdomain>jrcmd 1908 dump_flightrecording name=myfirstgeoosbrecording recording=2 copy_to_file=myfirstgeoosbrecordingf
ile.jfr compress_copy=true
1908:


C:\bea11\user_projects\domains\osbdomain>dir

Directory of C:\bea11\user_projects\domains\osbdomain
......
12-06-2010 16:53 206.158 myfirstgeoosbrecordingfile.jfr
......


Now you can open the file with JRockit Mission Control


To dump on OutOfMemoryException:
-XX:+FlightRecordingDumpOnUnhandledException

To specify a settings file (more than 1 is possible):
-XX:FlightRecorderOptions=settings=s1.jfs,settings=s2.jfs



To start recording:
jrcmd start_flightrecording settings=filename.jfs

In JROCKIT_HOME\jre\lib\jfr\default.jfs you find an example of settings.

Non-Persistent (profiling data are kept im memory only) is the default storage mode. Typically max 1 minute of history.

REMEMBER TO ENABLE THE "DIAGNOSTIC VOLUME" setting (to Low, Medium or High, but not Off) on your WebLogic server configuration, otherwise Hot Methods will not work!