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KDUMP(1)               DragonFly General Commands Manual              KDUMP(1)

NAME
     kdump - display kernel trace data

SYNOPSIS
     kdump [-acdjnlRT] [-f file] [-m maxdata] [-t [cnisuwy]] [-p pid]

DESCRIPTION
     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
                 and -R.

     -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.
                 Suppressing 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
                 epoch).

     -t cnisuwy  See the -t option of ktrace(1).

FILES
     ktrace.out  default ktrace dump file

SEE ALSO
     ktrace(1)

HISTORY
     The kdump command appeared in 4.4BSD.

DragonFly 6.5-DEVELOPMENT        April 4, 2023       DragonFly 6.5-DEVELOPMENT