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pmdasummary

NAME

pmdasummary - summary performance metrics domain agent (PMDA)

SYNOPSIS

$PCP_PMDAS_DIR/summary/pmdasummary [-c configfile] [-d domain] [-h helpfile] [-l logfile] pmie-command-line

DESCRIPTION

pmdasummary is a Performance Metrics Domain Agent (PMDA) which derives performance metrics values from values made available by other PMDAs. pmdasummary consists of two processes:

pmie process

The inference engine for performance values pmie(1) is used to periodically sample values for the base metrics and compute the derived values. This process is launched with the given pmie-command-line arguments by the main process, described below.

main process

The main process reads and buffers the values computed by pmie(1) and makes them available to the performance metrics collector daemon pmcd(1).

A brief description of the pmdasummary command line options follows:

-c

When used to summarize metrics from multiple hosts, pmdasummary reads host information from configfile. This is a binary file produced by $PCP_PMDAS_DIR/array/mkconfig, and so this option may only be used if the add-on PCP for Arrays product is also installed.

-d

It is absolutely crucial that the performance metrics domain number specified here is unique and consistent. That is, domain should be different for every PMDA on the one host, and the same domain number should be used for the same PMDA on all hosts.

-h

This option specifies an alternative help text file helpfile for describing the metrics that pmdasummary represents.

-l

Location of the log file. By default, a log file named summary.log is written in the current directory of pmcd(1) when pmdasummary is started, i.e. $PCP_LOG_DIR/pmcd. If the log file cannot be created or is not writable, output is written to the standard error instead.

INSTALLATION

If you want access to the names, help text and values for the summary performance metrics, do the following as root:

 # cd $PCP_PMDAS_DIR/summary
 # ./Install
 

If you want to undo the installation, do the following as root:

 # cd $PCP_PMDAS_DIR/summary
 # ./Remove
 

pmdasummary is launched by pmcd(1) and should never be executed directly. The Install and Remove scripts notify pmcd(1) when the agent is installed or removed.

FILES

$PCP_PMCDCONF_PATH

command line options used to launch pmdasummary

$PCP_PMDAS_DIR/summary/expr.pmie

default pmie(1) expressions defining the summary metrics

$PCP_PMDAS_DIR/summary/help

default help text for the summary metrics

$PCP_PMDAS_DIR/summary/Install

installation script for the pmdasummary agent

$PCP_PMDAS_DIR/summary/Remove

undo installation script for the pmdasummary agent

$PCP_LOG_DIR/pmcd/summary.log

default log file for error messages and other information from pmdasummary

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) and pmie(1).