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KDUMP(1) DragonFly General Commands Manual KDUMP(1)
kdump -- display kernel trace data
kdump [-acdjnlRT] [-f file] [-m maxdata] [-t [cnisuw]] [-p pid]
The kdump command displays the kernel trace files produced with ktrace(1)
in human readable format. By default, the file ktrace.out in the current
directory is displayed, which may be overridden by the -f option.
The options are as follows:
-a Display full human readable output. This option turns on -c
-c Display the cpu the thread is executing on.
-d Display all numbers in decimal.
-j Use a fixed format output, otherwise a more human readable
output is used.
-f file Display the specified file instead of ktrace.out.
-l Loop reading the trace file, once the end-of-file is reached,
waiting for more data.
-m maxdata Display at most maxdata bytes when decoding I/O; set to 0 to
disable the size limit.
-p pid Display only records for process pid.
-n Suppress ad hoc translations. Normally kdump tries to decode
many system calls into a more human readable format. For
example, ioctl(2) values are replaced with the macro name and
errno values are replaced with the strerror(3) string. Sup-
pressing this feature yields a more consistent output format
and is easily amenable to further processing.
-R Display relative timestamps (time since previous entry).
-T Display absolute timestamps for each entry (seconds since
-t cnisuw See the -t option of ktrace(1).
ktrace.out default ktrace dump file
The kdump command appeared in 4.4BSD.
DragonFly 5.3 October 5, 2017 DragonFly 5.3