12-29-2011
Glance and trace over the time
Do you know if Glance is capable to trace a process (or processes) per memory use over the time?
I want to have snapshots for example morning and midnigth then compare the info after one weak in order to determine if I have a memory leak in some process I am observing. Is it possible with glace without programing cronjobs or any other command as "at" ?
BR
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LEARN ABOUT OPENDARWIN
ktrace
KTRACE(1) BSD General Commands Manual KTRACE(1)
NAME
ktrace -- enable kernel process tracing
SYNOPSIS
ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t trstr]
ktrace [-adi] [-f trfile] [-t trstr] command
DESCRIPTION
The ktrace command enables kernel trace logging for the specified processes. Kernel trace data is logged to the file ktrace.out. The kernel
operations that are traced include system calls, namei translations, signal processing, and I/O.
Once tracing is enabled on a process, trace data will be logged until either the process exits or the trace point is cleared. A traced
process can generate enormous amounts of log data quickly; It is strongly suggested that users memorize how to disable tracing before
attempting to trace a process. The following command is sufficient to disable tracing on all user owned processes, and, if executed by root,
all processes:
$ ktrace -C
The trace file is not human readable; use kdump(1) to decode it.
The options are as follows:
-a Append to the trace file instead of recreating it.
-C Disable tracing on all user owned processes, and, if executed by root, all processes in the system.
-c Clear the trace points associated with the specified file or processes.
-d Descendants; perform the operation for all current children of the designated processes.
-f file
Log trace records to file instead of ktrace.out.
-g pgid
Enable (disable) tracing on all processes in the process group (only one -g flag is permitted).
-i Inherit; pass the trace flags to all future children of the designated processes.
-p pid Enable (disable) tracing on the indicated process id (only one -p flag is permitted).
-t trstr
The string argument represents the kernel trace points, one per letter. The following table equates the letters with the trace-
points:
c trace system calls
n trace namei translations
i trace I/O
s trace signal processing
u userland traces
w context switches
command
Execute command with the specified trace flags.
The -p, -g, and command options are mutually exclusive.
EXAMPLES
# trace all kernel operations of process id 34
$ ktrace -p 34
# trace all kernel operations of processes in process group 15 and # pass the trace flags to all current and future children
$ ktrace -idg 15
# disable all tracing of process 65
$ ktrace -cp 65
# disable tracing signals on process 70 and all current children
$ ktrace -t s -cdp 70
# enable tracing of I/O on process 67
$ ktrace -ti -p 67
# run the command "w", tracing only system calls
$ ktrace -tc w
# disable all tracing to the file "tracedata"
$ ktrace -c -f tracedata
# disable tracing of all processes owned by the user
$ ktrace -C
SEE ALSO
kdump(1)
BUGS
Only works if file is a regular file.
HISTORY
The ktrace command appeared in 4.4BSD.
BSD
June 6, 1993 BSD