репортер показателей производительности (performance metrics reporter)
Описание (Description)
pmrep is a customizable performance metrics reporting tool. Any
available performance metric, live or archived, system and/or
application, can be selected for reporting using one of the
output alternatives listed below together with applicable
formatting options.
pmrep collects selected metric values through the facilities of
the Performance Co-Pilot (PCP), see PCPIntro(1). The metrics to
be reported are specified on the command line, in a configuration
file, or both. Metrics can be automatically converted and scaled
using the PCP facilities, either by default or by per-metric
scaling specifications. In addition to the existing metrics,
derived metrics can be defined using the arithmetic expressions
described in pmRegisterDerived(3).
A wide range of metricsets (see below) is included by default,
providing reports on per-process details, NUMA performance,
mimicking other tools like sar(1) and more, see the pmrep
configuration files under $PCP_SYSCONF_DIR/pmrep (typically
/etc/pcp/pmrep) for details. Tab completion for options,
metrics, and metricsets is available for bash and zsh.
Unless directed to another host by the -h option, pmrep will
contact the Performance Metrics Collector Daemon (PMCD, see
pmcd(1)) on the local host.
The -a option causes pmrep to use the specified set of archive
logs rather than connecting to a PMCD. The -a and -h options are
mutually exclusive.
The -L option causes pmrep to use a local context to collect
metrics from DSO PMDAs (Performance Metrics Domain Agents,
``plugins'') on the local host without PMCD. Only some metrics
are available in this mode. The -a, -h, and -L options are
mutually exclusive.
The metrics of interest are named in the metricspec argument(s).
If a metricspec specifies a non-leaf node in the Performance
Metrics Name Space (PMNS), then pmrep will recursively descend
the PMNS and report on all leaf nodes (i.e., metrics) for that
metricspec. Use pminfo(1) to list all the metrics (PMNS lead
nodes) and their descriptions.
A metricspec has three different forms. First, on the command
line it can start with a colon (``:'') to indicate a metricset to
be read from a pmrep configuration file (see pmrep.conf(5)),
which can then consist of any number of metrics. Second, a
metricspec starting with non-colon specifies a PMNS node as
described above, optionally followed by metric output formatting
definitions. This so-called compact form of a metricspec is
defined as follows:
metric[,label[,instances[,unit/scale[,type[,width[,precision[,limit]]]]]]]
A valid PMNS node (metric) is mandatory. It can be followed by a
text label used with stdout output. The optional instances
definition restricts csv and stdout reporting to the specified
instances of the metric so non-matching instances will be
filtered out (see -i). An optional unit/scale is applicable for
dimension-compatible, non-string metrics. See below for
supported unit/scale specifications. By default, cumulative
counter metrics are converted to rates, an optional type can be
set to raw to disable this rate conversion. For stdout output a
numeric width can be used to set the width of the output column
for this metric. Too wide strings in the output will be
truncated to fit the column. A metric-specific precision can be
provided for numeric non-integer output values. Lastly, a
metric-specific limit can be set for filtering out numeric values
per the limit.
As a special case for metrics that are counters with time units
(nanoseconds to hours), the unit/scale can be used to change the
default reporting (for example, milliseconds / second) to
normalize to the range zero to one by setting this to sec (see
also -y and -Y).
The following metricspec requests the metric kernel.all.sysfork
to be reported under the text label forks, converting to the
metric default rate count/s in an 8 wide column. Although the
definitions in this compact form are optional, they must always
be provided in the order specified above, thus the commas.
kernel.all.sysfork,forks,,,,8
The third form of a metricspec, verbose form, is described and
valid only in pmrep.conf(5).
Derived metrics are specified like regular PMNS leaf node
metrics.
Options via environment values (see pmGetOptions(3)) override the
corresponding built-in default values (if any). Configuration
file options override the corresponding environment variables (if
any). Command line options override the corresponding
configuration file options (if any).
