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KERNEL PMDAS(1) 								  KERNEL PMDAS(1)

NAME
       pmdaaix,  pmdadarwin, pmdafreebsd, pmdalinux, pmdanetbsd, pmdasolaris, pmdawindows - oper-
       ating system kernel performance metrics domain agents

SYNOPSIS
       $PCP_PMDAS_DIR/aix/pmdaaix [-d domain] [-l logfile] [-U username]
       $PCP_PMDAS_DIR/darwin/pmdadarwin [-d domain] [-l logfile] [-U username]
       $PCP_PMDAS_DIR/freebsd/pmdafreebsd [-d domain] [-l logfile] [-U username]
       $PCP_PMDAS_DIR/linux/pmdalinux [-d domain] [-l logfile] [-U username]
       $PCP_PMDAS_DIR/netbsd/pmdanetbsd [-d domain] [-l logfile] [-U username]
       $PCP_PMDAS_DIR/solaris/pmdasolaris [-d domain] [-l logfile] [-U username]
       $PCP_PMDAS_DIR/windows/pmdawindows [-d domain] [-l logfile] [-U username]

DESCRIPTION
       Each supported platform has  a  kernel  Performance  Metrics  Domain  Agent  (PMDA)  which
       extracts performance metrics from the kernel of that platfrom.  A variety of platform-spe-
       cific metrics are available, with an equally varied set of access mechanisms  -	typically
       this  involves  special	system calls, or reading from files in kernel virtual filesystems
       such as the Linux sysfs and procfs filesystems.

       The platform kernel PMDA is one of the most critical components of the  PCP  installation,
       and  must be as efficient and reliable as possible.  In all installations the default ker-
       nel PMDA will be installed as a shared library  and  thus  executes  directly  within  the
       pmcd(1)	process.   This  slightly reduces overheads associated with querying the metadata
       and values associated with these metrics (no message passing is required).

       Unlike many other PMDAs, the kernel PMDA exports a number of  metric  namespace	subtrees,
       such as kernel, network, swap, mem, ipc, filesys, nfs, disk and hinv (hardware inventory).

       Despite usually running as shared libraries, most installations also include a stand-alone
       executable for the kernel PMDA.	This is to aid profiling and debugging	activities,  with
       dbpmda(1) for example.  In this case (but not for shared libraries), the following command
       line options are available:

       -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.

       -l   Location of the log file.  By default, a log file named [platform].log is written  in
	    the   current   directory	of   pmcd(1)   when   pmda[platform]   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.

       -U   User  account  under  which  to run the agent.  The default is the unprivileged "pcp"
	    account in current versions of PCP, but  in  older	versions  the  superuser  account
	    ("root") was used by default.

INSTALLATION
       Access  to the names, help text and values for the kernel performance metrics is available
       by default - unlike most other agents, no action is  required  to  enable  them	and  they
       should not be removed.

FILES
       $PCP_PMDAS_DIR/[platform]/help
		 default help text file for the the kernel metrics
       $PCP_LOG_DIR/pmcd/pmcd.log
		 default log file for error messages and other information from the kernel PMDA.

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 config-
       uration file, as described in pcp.conf(5).

SEE ALSO
       PCPIntro(1), dbpmda(1) pmcd(1), pcp.conf(5) and pcp.env(5).

Performance Co-Pilot			       PCP				  KERNEL PMDAS(1)
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