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 Met
rics Name Space (PMNS), however if the -n option is speci
fied 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 dec
imal digits or ``0x'' and some hexadecimal digits.
``0X'' is also acceptable in lieu of ``0x''. See str
tol(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 scien
tific notation. See strtod(3C).
3. If the metric has a string type, then value is inter
preted 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,
gate, ``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), pmchart(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_...)
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