pmstore - modify performance metric values
pmstore [-h host] [-i instances] [-n pmnsfile] metricname value
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 Perfor-
mance 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.
3. If the metric has a string type, then value is interpreted as a literal string of
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
default PMNS specification files
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 config-
uration file, as described in pcp.conf(5).
pmcd(1), pminfo(1), pmval(1), strtod(3C) and strtol(3C).
Two messages indicate a mismatch between the internal data type for metricname and the
The value "???" is out of range for the data type (PM_TYPE_...)
The value "???" is incompatible with the data type (PM_TYPE_...)
Performance Co-Pilot PCP PMSTORE(1)