pmloadnamespace(3) — Linux manual page

PMLOADNAMESPACE(3)      Library Functions Manual      PMLOADNAMESPACE(3)

NAME

       pmLoadNameSpace - load a local PMNS for an application

C SYNOPSIS

       #include <pcp/pmapi.h>

       int pmLoadNameSpace(const char *filename);

       cc ... -lpcp

DESCRIPTION

       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 pmLoadNameSpace.

       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, 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
       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.

DIAGNOSTICS

       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

       $PCP_VAR_DIR/pmns/root   the default local PMNS, when the
                                environment variable PMNS_DEFAULT is
                                unset

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(5).  Values for these variables may be obtained
       programmatically using the pmGetConfig(3) function.

SEE ALSO

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

COLOPHON

       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 pcp@groups.io.  This page was obtained from the
       project's upstream Git repository
       ⟨https://github.com/performancecopilot/pcp.git⟩ on 2024-06-14.
       (At that time, the date of the most recent commit that was found
       in the repository was 2024-06-14.)  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)

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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