NAME

       pmstore - modify performance metric values

SYNOPSIS

       pmstore [-h host] [-i instances] [-n pmnsfile] metricname value

DESCRIPTION

       Under  certain  circumstances, it is useful to be able to modify the values of performance
       metrics, for example to re-initialize counters or to assign new values to metrics that act
       as control variables.

       pmstore  changes  the  current  values for the nominated instances of a single performance
       metric, as identified by metricname and the list of instance identifiers following the  -i
       argument.   instances  must  be  a single argument, with elements of the list separated by
       commas and/or white space.  By default all instances of metricname will be updated.

       Normally pmstore operates on the default Performance Metrics Name Space (PMNS), however if
       the -n option is specified an alternative namespace is loaded from the file pmnsfile.

       Unless  directed  to  another  host  by  the  -h  option,  pmstore  will interact with the
       Performance Metric Collector Daemon (PMCD) on the local host.

       The interpretation of value is dependent on the syntax used in its specification  and  the
       underlying data type of metricname, as follows.

       1.  If  the  metric  has an integer type, then value should be an optional leading hyphen,
           followed either by decimal digits or ``0x'' and some hexadecimal  digits.   ``0X''  is
           also acceptable in lieu of ``0x''.  See strtol(3C) and the related routines.

       2.  If the metric has a floating point type, then value should be either in the form of an
           integer described above, or a fixed point number, or a number in scientific  notation.
           See strtod(3C).

       3.  If  the  metric  has  a  string type, then value is interpreted as a literal string of
           ASCII characters.

       4.  If the metric has any other type (i.e.  PM_TYPE_EVENT or  PM_TYPE_AGGREGATE)  then  no
           encoding  of  value from the command line makes sense, and the values of these metrics
           cannot be modified with pmstore.

       The output reports the old value and the new  value  for  each  updated  instance  of  the
       requested metric.

FILES

       $PCP_VAR_DIR/pmns/*
                 default PMNS specification files

PCP ENVIRONMENT

       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).

SEE ALSO

       pmcd(1), pminfo(1), pmval(1), strtod(3C) and strtol(3C).

DIAGNOSTICS

       Two messages indicate a mismatch between the internal data type  for  metricname  and  the
       value provided.

       The value "???" is out of range for the data type (PM_TYPE_...)

       The value "???" is incompatible with the data type (PM_TYPE_...)