02-21-2013
Thanks Tommy for clarification,
Now one more scenerio i want to add here as well:
Say with perfd 100%, i also got 100% Utilization from other few processes
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
14539 root 5 -20 48316 6680 1572 R 100.1 0.0 7356:25 /opt/perf/bin/perfd
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
14344 root 5 -20 48316 6680 1572 R 100.1 0.0 56:25 oracle
But my System is normal (i.e
Cpu9 : 0.0%us,3.5%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Why i have to add this here because,
my client complaint me that perfd is taking 100% CPU utilization , thus there system got in bad stage.
Now when perfd process is been killed, still we are finding other process are in 100% as well. But CPU9 is with 3.x%SY
So now point is when perfd was taking 100% CPU utilization then there would be more other factor which made the system performance weak.
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LEARN ABOUT OSX
procsystime
procsystime(1m) USER COMMANDS procsystime(1m)
NAME
procsystime - analyse system call times. Uses DTrace.
SYNOPSIS
procsystime [-acehoT] [ -p PID | -n name | command ]
DESCRIPTION
procsystime prints details on system call times for processes, both the elapsed times and on-cpu times can be printed.
The elapsed times are interesting, to help identify syscalls that take some time to complete (during which the process may have slept). CPU
time helps us identify syscalls that are consuming CPU cycles to run.
Since this uses DTrace, only users with root privileges can run this command.
OPTIONS
-a print all data
-c print syscall counts
-e print elapsed times, ns
-o print CPU times, ns
-T print totals
-p PID examine this PID
-n name
examine processes which have this name
EXAMPLES
Print elapsed times for PID 1871,
# procsystime -p 1871
Print elapsed times for processes called "tar",
# procsystime -n tar
Print CPU times for "tar" processes,
# procsystime -on tar
Print syscall counts for "tar" processes,
# procsystime -cn tar
Print elapsed and CPU times for "tar" processes,
# procsystime -eon tar
print all details for "bash" processes,
# procsystime -aTn bash
run and print details for "df -h",
# procsystime df -h
FIELDS
SYSCALL
System call name
TIME (ns)
Total time, nanoseconds
COUNT Number of occurrences
DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
procsystime will sample until Ctrl-C is hit.
AUTHOR
Brendan Gregg [Sydney, Australia]
SEE ALSO
dtruss(1M), dtrace(1M), truss(1)
version 1.00 Sep 22, 2005 procsystime(1m)