If the application wants to force using a local Performance Metrics
Name Space (PMNS) instead of a distributed PMNS then it must load the
PMNS using pmLoadNameSpace or pmLoadASCIINameSpace(3). If the
application is to use a distributed PMNS, then it should NOT make a
call to load the PMNS explicitly.
Most applications using a Performance Metrics Application Programming
Interface (PMAPI) context (of any type, so PM_CONTEXT_HOST or
PM_CONTEXT_ARCHIVE or PM_CONTEXT_LOCAL) should not need to call
The filename argument designates the PMNS of interest. For
applications not requiring a tailored PMNS, the special value
PM_NS_DEFAULT may be used for filename, to force the default local
PMNS to be loaded.
The default local PMNS is found in the file $PCP_VAR_DIR/pmns/root
unless the environment variable PMNS_DEFAULT is set, in which case
the value is assumed to be the pathname to the file containing the
default local PMNS.
Externally a PMNS is stored in an ASCII format as described in
pmns(5). However, note that pmLoadNameSpace assumes filename does
not contain any C-style comments, pre-processor directives or macros;
if this is not the case, pmLoadASCIINameSpace(3) should be used
As of Version 3.10.3 of PCP, by default, multiple names in the PMNS
are allowed to be associated with a single Performance Metrics
Identifier (PMID) and this is unconditionally allowed by
pmLoadNameSpace. pmLoadASCIINameSpace(3) provides an alternative
interface with user-defined control over the handling of duplicate
names for the same PMID in the PMNS.
pmLoadNameSpace returns zero on success.
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(5). Values for these
variables may be obtained programmatically using the pmGetConfig(3)
Syntax and other errors in the parsing of the PMNS are reported on
stderr with a message of the form ``Error Parsing ASCII PMNS: ...''.
It is an error to try and load more than one PMNS, or to call
either pmLoadNameSpace and/or pmLoadASCIINameSpace(3) more
Syntax error in the PMNS file.
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at ⟨http://www.pcp.io/⟩.
If you have a bug report for this manual page, send it to
firstname.lastname@example.org. This page was obtained from the project's upstream
Git repository ⟨git://git.pcp.io/pcp⟩ on 2017-03-13. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
Performance Co-Pilot PCP PMLOADNAMESPACE(3)