PMDASYSTEMTAP(1)					       Performance Co-Pilot						  PMDASYSTEMTAP(1)

NAME

       pmdasystemtap - Systemtap performance metrics domain agent (PMDA)

DESCRIPTION

       pmdasystemtap is a Performance Metrics Domain Agent (PMDA) which exports metric values from the Linux Systemtap dynamic tracing toolkit.

       This implementation uses the stap(1) tool, which is a front-end to the Systemtap toolkit.

INSTALLATION

       In order to access performance data exported by Systemtap from with PCP, it is necessary to perform two configuration steps:

       1.  Configure Systemtap probes, and verify them with stap(1).  These should be produced in a format that is easily parsed, and then stored
	   in the $PCP_PMDAS_DIR/systemtap/probes.stp file.

       2.  Configure pmdasystemtap to extract the values from the text produced by stap.  Two example probes are implemented in the default
	   systemtap PMDA script - readdir and sync traces (see $PCP_PMDAS_DIR/systemtap/pmdasystemtap.pl for details).

	       # cd $PCP_PMDAS_DIR/systemtap
	       # [ edit probes.stp, test /usr/bin/stap probes.stp ]
	       # [ edit pmdasystemtap.pl ]

       Once this is setup, you can access the names and values for the systemtap performance metrics by doing the following as root:

	       # cd $PCP_PMDAS_DIR/systemtap
	       # ./Install

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

	       # cd $PCP_PMDAS_DIR/systemtap
	       # ./Remove

       pmdasystemtap 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_PMDAS_DIR/systemtap/probes.stp
	   probe configuration file for stap(1), run by pmdasystemtap

       $PCP_PMDAS_DIR/systemtap/Install
	   installation script for the pmdasystemtap agent

       $PCP_PMDAS_DIR/systemtap/Remove
	   undo installation script for the pmdasystemtap agent

       $PCP_LOG_DIR/pmcd/systemtap.log
	   default log file for error messages from pmdasystemtap

SEE ALSO

       pmcd(1) and stap(1).

3.8.10							       Performance Co-Pilot						  PMDASYSTEMTAP(1)