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 an aggregate type, then an attempt is made to
interpret value as an integer, else a floating point number, else a
string. In the first two cases, the minimal word length encoding
is used, e.g. ‘‘123’’ would be interpreted as a 4-byte aggregate,
‘‘0x100000000’’ would be interpreted as an 8-byte aggregate.
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(4).
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_...)