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pmloadnamespace(3) — Linux manual page

PMLOADNAMESPACE(3) Library Functions Manual PMLOADNAMESPACE(3)

NAME top

 pmLoadNameSpace - load a local PMNS for an application

C SYNOPSIS top

 #include <pcp/pmapi.h>
 int pmLoadNameSpace(const char *filename);
 cc ... -lpcp

DESCRIPTION top

 If the application wants to force using a local Performance Met‐
 rics 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 Program‐
 ming Interface (PMAPI) context (of any type, so PM_CONTEXT_HOST or
 PM_CONTEXT_ARCHIVE or PM_CONTEXT_LOCAL) should not need to call
 pmLoadNameSpace.
 The filename argument designates the PMNS of interest. For appli‐
 cations not requiring a tailored PMNS, the special value PM_NS_DE‐
 FAULT 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, preprocessor directives or
 macros; if this is not the case, pmLoadASCIINameSpace(3) should be
 used instead.
 As of Version 3.10.3 of PCP, by default, multiple names in the
 PMNS are allowed to be associated with a single Performance Met‐
 rics Identifier (PMID) and this is unconditionally allowed by pm‐
 LoadNameSpace. 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.

DIAGNOSTICS top

 Syntax and other errors in the parsing of the PMNS are reported on
 stderr with a message of the form ``Error Parsing ASCII PMNS:
 ...''.
 PM_ERR_DUPPMNS
 It is an error to try and load more than one PMNS, or to
 call either pmLoadNameSpace and/or pmLoadASCIINameSpace(3)
 more than once.
 PM_ERR_PMNS
 Syntax error in the PMNS file.

FILES top

 $PCP_VAR_DIR/pmns/root the default local PMNS, when the environ‐
 ment variable PMNS_DEFAULT is unset

PCP ENVIRONMENT top

 Environment variables with the prefix PCP_ are used to parameter‐
 ize the file and directory names used by PCP. On each installa‐
 tion, the file /etc/pcp.conf contains the local values for these
 variables. The $PCP_CONF variable may be used to specify an al‐
 ternative configuration file, as described in pcp.conf(5). Values
 for these variables may be obtained programmatically using the
 pmGetConfig(3) function.

SEE ALSO top

 PMAPI(3), pmGetConfig(3), pmLoadASCIINameSpace(3),
 pmTrimNameSpace(3), pcp.conf(5), pcp.env(5) and PMNS(5).

COLOPHON top

 This page is part of the PCP (Performance Co-Pilot) project. In‐
 formation about the project can be found at ⟨http://www.pcp.io/⟩.
 If you have a bug report for this manual page, send it to
 pcp@groups.io. This page was obtained from the project's upstream
 Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
 2025年08月11日. (At that time, the date of the most recent commit
 that was found in the repository was 2025年08月11日.) 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 to man-pages@man7.org
Performance Co-Pilot PCP PMLOADNAMESPACE(3)

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Pages that refer to this page: pcpintro(1), pmcpp(1), pmnscomp(1), pcpintro(3), pmapi(3), pmgetchildren(3), pmgetchildrenstatus(3), pmgetpmnslocation(3), pmloadasciinamespace(3), pmlookupname(3), pmnameall(3), pmnameid(3), pmtrimnamespace(3), pmunloadnamespace(3), pmns(5)

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