pmevent(1) — Linux manual page


PMVAL(1)                   General Commands Manual                  PMVAL(1)

NAME         top

       pmval, pmevent - arbitrary performance metrics value dumper

SYNOPSIS         top

       pmval [-dgLrvVz?]  [-a archive] [-A align] [-f N] [-h host] [-i
       instances] [-K spec] [-n pmnsfile] [-O offset] [-p port] [-s samples]
       [-S starttime] [-t interval] [-T endtime] [-U archive] [-w width] [-x
       pattern] [-Z timezone] [--container=name] [--derived=file] metricname

       pmevent ...

DESCRIPTION         top

       pmval prints current or archived values for the nominated performance
       metric.  The metric of interest is named in the metricname argument,
       subject to instance qualification with the -i flag as described

       Unless directed to another host by the -h option, or to a set of
       archives by the -a or -U options, pmval will contact the Performance
       Metrics Collector Daemon (PMCD) on the local host to obtain the
       required information.

       The metricname argument may also be given in the metric specification
       syntax, as described in PCPIntro(1), where the source, metric and
       instance may all be included in the metricname, e.g.
       thathost:kernel.all.load["1 minute"].  When this format is used, none
       of the -h or -a or -U options may be specified.

       When using the metric specification syntax, the ``hostname'' @ is
       treated specially and causes pmval to use a local context to collect
       metrics from PMDAs on the local host without PMCD.  Only some metrics
       are available in this mode.

       When processing a set of archives, pmval may relinquish its own
       timing control, and operate under the control of a a pmtime(1)
       process that uses a GUI dialog to provide timing control.  In this
       case, either the -g option should be used to start pmval as the sole
       client of a new pmtime(1) instance, or -p should be used to attach
       pmval to an existing pmtime(1) instance via the IPC channel
       identified by the port argument.

       The -S, -T, -O and -A options may be used to define a time window to
       restrict the samples retrieved, set an initial origin within the time
       window, or specify a ``natural'' alignment of the sample times; refer
       to PCPIntro(1) for a complete description of these options.

       The output from pmval is directed to standard output.  The following
       symbols may occasionally appear, in place of a metric value, in pmval
       output:  A question mark symbol (?) indicates that a value is no
       longer available for that metric instance.  An exclamation mark (!)
       indicates that a 64-bit counter wrapped during the sample.

       pmevent is an alias for pmval.

OPTIONS         top

       The available command line options are:

       -a archive, --archive=archive
            Performance metric values are retrieved from the set of
            Performance Co-Pilot (PCP) archive log files identified by the
            archive argument, which is a comma-separated list of names, each
            of which may be the base name of an archive or the name of a
            directory containing one or more archives.  See also -U.

       -A align, --align=align
            Force the initial sample to be aligned on the boundary of a
            natural time unit align.  Refer to PCPIntro(1) for a complete
            description of the syntax for align.

       -d, --delay
            When replaying from an archive, this option requests that the
            prevailing real-time delay be applied between samples (see -t)
            to effect a pause, rather than the default behaviour of
            replaying at full speed.

       -f precision, --precision=precision
            Numbers are reported in ``fixed point'' notation, rather than
            the default scientific notation, using precision digits for
            precision.  Each number will be up to the column width
            determined by the default heuristics, else the -w option if
            specified, and include precision digits after the decimal point.
            So, the options -f 3 -w 8 would produce numbers of the form
            9999.999.  A value of zero for precision omits the decimal point
            and any fractional digits.

       -g, --guimode
            Start pmval as the sole client of a new pmtime(1) server process
            for replay of archived performance data using the pmtime(1)
            graphical user interface.

       -h host, --host=host
            Fetch performance metrics from pmcd(1) on host, rather than from
            the default localhost.

       -i instances, --instances=instances
            Specify a list of one or more names of instances for the
            nominated performance metric - just these instances will be
            retrieved and reported (the default is to report all instances).
            The list must be a single argument, with elements of the list
            separated by commas and/or white space.

            The instance name may be quoted with single (') or double (")
            quotes for those cases where the instance name contains white
            space or commas.

            Multiple -i options are allowed as an alternative way of
            specifying more than one instance of interest.

            As an example, the following are all equivalent:

                 $ pmval -i "'1 minute','5 minute'" kernel.all.load
                 $ pmval -i '"1 minute","5 minute"' kernel.all.load
                 $ pmval -i "'1 minute' '5 minute'" kernel.all.load
                 $ pmval -i "'1 minute'" -i "'5 minute'" kernel.all.load
                 $ pmval 'localhost:kernel.all.load["1 minute","5 minute"]'

       -K spec, --spec-local=spec
            When fetching metrics from a local context (see -L), the -K
            option may be used to control the DSO PMDAs that should be made
            accessible.  The spec argument conforms to the syntax described
            in pmSpecLocalPMDA(3).  More than one -K option may be used.

       -L, --local-PMDA
            Use a local context to collect metrics from DSO PMDAs on the
            local host without PMCD.  See also -K.

       -n pmnsfile, --namespace=pmnsfile
            Load an alternative Performance Metrics Name Space (PMNS(5))
            from the file pmnsfile.

       -O origin, --origin=origin
            When reporting archived metrics, start reporting at origin
            within the time window (see -S and -T).  Refer to PCPIntro(1)
            for a complete description of the syntax for origin.

       -p port, --guiport=port
            Attach pmval to an existing pmtime(1) time control process
            instance via the IPC channel identified by the port argument.
            This option is normally only used by other tools, e.g.
            pmchart(1), when they launch pmval with synchronized time

       -r, --raw
            Print raw values for cumulative counter metrics.  Normally
            cumulative counter metrics are converted to rates.  For example,
            disk transfers are reported as number of disk transfers per
            second during the preceding sample interval, rather than the raw
            value of number of disk transfers since the machine was booted.
            If you specify this option, the raw metric values are printed.

       -s samples, --samples=samples
            The samples argument defines the number of samples to be
            retrieved and reported.  If samples is 0 or -s is not specified,
            pmval will sample and report continuously (in real time mode) or
            until the end of the set of PCP archives (in archive mode).

       -S starttime, --start=starttime
            When reporting archived metrics, the report will be restricted
            to those records logged at or after starttime.  Refer to
            PCPIntro(1) for a complete description of the syntax for

       -t interval, --interval=interval
            Set the reporting interval to something other than the default 1
            second.  The interval argument follows the syntax described in
            PCPIntro(1), and in the simplest form may be an unsigned integer
            (the implied units in this case are seconds).

       -T endtime, --finish=endtime
            When reporting archived metrics, the report will be restricted
            to those records logged before or at endtime.  Refer to
            PCPIntro(1) for a complete description of the syntax for

       -U archive, --nointerp=archive
            Performance metric values are retrieved from the Performance Co-
            Pilot (PCP) archive.  The argument is a comma-separated list of
            names, each of which may be the base name of an archive or the
            name of a directory containing one or more archives.  However,
            unlike -a every recorded value in the archive for the selected
            metric and instances is reported (so no interpolation mode, and
            the sample interval (-t option) is ignored.  See also -a.

            At most one of the options -a and -U may be specified.

       -v, --verbose
            Enable verbose mode.

       -V, --version
            Display version number and exit.

       -w width, --width=width
            Set the width of each column of output to be width columns.  If
            not specified columns are wide enough to accommodate the largest
            value of the type being printed.

       -x pattern, --filter=pattern
            The given pattern is sent to the performance metric domain agent
            for the requested metricname before any values are requested.
            This serves two purposes.  Firstly, it provides a mechanism for
            server-side event filtering that is customisable for individual
            event streams.  In addition, some performance metrics domain
            agents also use the PMCD store mechanism to provide a basic
            security model (e.g. for sensitive log files, only a client host
            with pmStore(3) access would be able to access the event

            As pattern may be processed by regcomp(3) it should be a non-
            empty string.  Use . (dot) for a “match all” pattern.

       -z, --hostzone
            Use the local timezone of the host that is the source of the
            performance metrics, as identified by either the -h or the -a or
            the -U options.  The default is to use the timezone of the local

       -Z timezone, --timezone=timezone
            Use timezone for the date and time.  Timezone is in the format
            of the environment variable TZ as described in environ(7).

       -?, --help
            Display usage message and exit.

            Specify an individual container to be queried.

            Load derived metric definitions from file.

CAVEATS         top

       By default, pmval attempts to display non-integer numeric values in a
       way that does not distort the inherent precision (rarely more than 4
       significant digits), and tries to maintain a tabular format in the
       output.  These goals are sometimes in conflict.

       In the absence of the -f option (described above), the following
       table describes the formats used for different ranges of numeric
       values for any metric that is of type PM_TYPE_FLOAT or
       PM_TYPE_DOUBLE, or any metric that has the semantics of a counter
       (for which pmval reports the rate converted value):

                        │ Format   │     Value Range      │
                        │        ! │ No values available  │
                        │9.999E-99 │ < 0.1                │
                        │   0.0    │ 0                    │
                        │   9.9999 │ > 0 and <= 0.9999    │
                        │   9.999  │ > 0.9999 and < 9.999 │
                        │  99.99   │ > 9.999 and < 99.99  │
                        │ 999.9    │ > 99.99 and < 999.9  │
                        │9999.     │ > 999.9 and < 9999   │
                        │9.999E+99 │ > 9999               │

DIAGNOSTICS         top

       All are generated on standard error and are intended to be self-


       Environment variables with the prefix PCP_ are used to parameterize
       the file and directory names used by PCP.  On each installation, the
       file /etc/pcp.conf contains the local values for these variables.
       The $PCP_CONF variable may be used to specify an alternative
       configuration file, as described in pcp.conf(5).

       For environment variables affecting PCP tools, see pmGetOptions(3).

SEE ALSO         top

       PCPIntro(1), pmcd(1), pmchart(1), pmdumplog(1), pmdumptext(1),
       pminfo(1), pmlogger(1), pmrep(1), pmtime(1), PMAPI(3), pmStore(3),
       pmSpecLocalPMDA(3), pcp.conf(5), pcp.env(5) and PMNS(5).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at ⟨⟩.
       If you have a bug report for this manual page, send it to  This page was obtained from the project's upstream
       Git repository ⟨⟩ on
       2020-11-01.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-10-30.)  If you discover any
       rendering problems in this HTML version of the page, or you believe
       there is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Performance Co-Pilot                 PCP                            PMVAL(1)

Pages that refer to this page: pmdabash(1)pmdalogger(1)pmdasystemd(1)