KCOLLECT(8)

NAME
kcollect - extract kernel-collected statistics

SYNOPSIS
kcollect [-o fields] [-O format] [-b file] [-d file] [-r file] [-f] [-F] [-l] [-g] [-s] [-t time] [-G] [-W width] [-H height] [-w plotfile] [-x gnuplot_options]

DESCRIPTION
The kcollect utility extracts regularly collected statistics accumulated by the kernel. The kernel typically keeps around 23 hours worth of statistics. If no specific output option is specified, a human-readable text dump of the accumulated statistics will be output starting with the most recent collection and then going back in time.

The following options are available:

-o fields
    Indicate which fields to extract. If not specified, all available fields are extracted. Unknown fields are ignored. Note that not all commands will filter based on the field list.

    You may specify space or comma-separated fieldnames. Whitespace is ignored. Use the -l option to get a list of available fields.

-O format
    Specify the desired output format. The following output formats are available:

    text
        This is the default. It produces a human readable text output.

    influxdb
        EXPERIMENTAL. It tries to dump the entries in an InfluxDB line protocol compatible format.

-b file
    Dump the data to a dbm database, creating the database if necessary. Data is indexed by gmt time, which will be calculated from the ticks. Duplicate tuples are ignored. The database will retain data from prior runs.

-d file
    Load the data from a dbm database instead of loading the active data from the current machine.

-r file
    This will overwrite headers stored in the specified dbm database with the in-memory headers. This can be used to renormalize saved historical dbm files when machine specs change, or if the dbm is somehow missing the header fields.

-g  Generate gnuplot output for the data.

-s  Smooth plot output (only applicable to gnuplot). This may make it more readable. Data is smoothed using an exponential average over 10 samples (~100 seconds).

-t time
    Specify the number of seconds worth of recent data to extract. The 'm', 'h', and 'd' suffixes can be used to specify the value in minutes, hours, or days.

-x  Generate gnuplot output for the data and pipe it to gnuplot for display to X11.

-l  List all available fields and the field format

-f  Dump available output then enter a 60-second sleep/collection loop to incrementally collect and output more data. If outputting to gnuplot, the plot will be updated regularly. However, please note that this is fairly expensive since the plot data has to be completely re-sent to gnuplot on each update.

-F  Same as -f but do not display the whole buffer at the beginning.

-w plotfile
    Generate gnuplot output to a .png or .jpg file, depending on the extension of the filename you supply.

-G  Timestamps for text output will be in GMT instead of localtime.

-W width

-H height
    Set the width and height of the output plot for the plotfile or for X. The default is 512x512.

The standard kcollect display shows the following statistics:

load
    system load average
user
    % of total cpu time in user mode
syst
    % of total cpu time in system mode
idle
    % of total cpu time in idle mode
swapuse
    % of total swap space used
swapano
    total amount of anonymous swap used in MB
swapcac
    total amount of swapcache in MB
fault
    total amount of vm faults including both zero-fill and cow faults
cow total amount of copy-on-write faults
zfill
    total amount of zero-fill faults
free
    amount of free memory in bytes
cache
    amount of almost free memory in bytes
inact
    amount of inactive memory in bytes
act amount of active memory in bytes
wired
    amount of wired/kernel memory in bytes
syscalls
    total amount of system calls
nlookup
    total amount of path lookups
intr
    total amount of nominal external interrupts
ipi total amount of inter-cpu interrupts
timer
    total amount of timer interrupts

The output fields in bytes are typically converted with humanize_number(3) before displaying, at least for the default output format.

SEE ALSO
systat(1)

HISTORY
A kcollect utility appeared in DragonFly 4.9.