pmnameid(3) [centos man page]

PMNAMEID(3)						     Library Functions Manual						       PMNAMEID(3)

NAME

       pmNameID - translate a PMID to a performance metric name

C SYNOPSIS

       #include <pcp/pmapi.h>

       int pmNameID(pmID pmid, char **name);

       cc ... -lpcp

DESCRIPTION

       Given  a  Performance  Metric ID (PMID) via pmid, pmNameID will determine the corresponding metric name, if any, in the Performance Metrics
       Name Space (PMNS), and return this via name.

       If the PMNS contains multiple names associated with the requested PMID, one of these will be returned via name, but  there  is  no  way	to
       determine which of the duplicate names this will be.  See pmNameAll(3) if all of the corresponding names are required.

       name  is  a  null-byte  terminated string, allocated by pmNameID using malloc(3C) and it is the caller's responsibility to call free(3C) to
       release the storage when the value is no longer required.

       In the absence of errors, pmNameID returns zero.

SEE ALSO

       PMAPI(3),  pmGetChildren(3),  pmGetChildrenStatus(3),   pmGetConfig(3),	 pmLoadASCIINameSpace(3),   pmLoadNameSpace(3),   pmLookupName(3),
       pmNameAll(3), pmNewContext(3), pcp.conf(5), pcp.env(5) and pmns(5).

DIAGNOSTICS

       PM_ERR_NOPMNS
	      Failed  to access a PMNS for operation.  Note that if the application hasn't a priori called pmLoadNameSpace(3) and wants to use the
	      distributed PMNS, then a call to pmNameId must be made after the creation of a context (see pmNewContext(3)).

       PM_ERR_PMID
	      pmid does not correspond to a defined PMID in the PMNS.

       PM_ERR_*
	      Other diagnostics are for protocol failures when accessing the distributed PMNS.

Performance Co-Pilot							PCP							       PMNAMEID(3)

PMTRIMNAMESPACE(3)					     Library Functions Manual						PMTRIMNAMESPACE(3)

NAME

       pmTrimNameSpace - prune a performance metrics name space

C SYNOPSIS

       #include <pcp/pmapi.h>

       int pmTrimNameSpace(void);

       cc ... -lpcp

DESCRIPTION

       If  the current Performance Metrics Application Programming Interface (PMAPI) context corresponds to a version 1 archive log of Performance
       Co-Pilot (PCP) performance metrics (as collected by pmlogger(1) -V1), then the currently loaded Performance Metrics Name Space  (PMNS),	is
       trimmed to exclude metrics for which no description can be found in the archive.  The PMNS is further trimmed to remove empty subtrees that
       do not contain any performance metric.

       Since PCP archives usually contain some subset of all metrics named in the default PMNS, pmTrimNameSpace  effectively  trims  the  applica-
       tion's PMNS to contain only the names of the metrics in the archive.

       Since PCP 2.0, pmTrimNameSpace is only needed for dealing with version 1 archives.  Version 2 archives actually store the "trimmed" PMNS.

       Prior to any trimming, the PMNS is restored to the state as of the completion of the last pmLoadASCIINameSpace(3) or pmLoadNameSpace(3), so
       the effects of consecutive calls to pmTrimNameSpace with archive contexts are not additive.

       If the current PMAPI context corresponds to a host and a pmLoadASCIINameSpace(3) or pmLoadNameSpace(3) call was made, then the PMNS reverts
       to all names loaded into the PMNS at the completion of the last pmLoadASCIINameSpace(3) or pmLoadNameSpace(3), i.e. any trimming is undone.

       On success, pmTrimNameSpace returns zero.

SEE ALSO

       pmlogger(1), PMAPI(3), pmLoadASCIINameSpace(3), pmLoadNameSpace(3), pmNewContext(3) and pmns(5).

DIAGNOSTICS

       PM_ERR_NOPMNS
	      you must have loaded a PMNS using pmLoadASCIINameSpace(3) or pmLoadNameSpace(3) before calling pmTrimNameSpace

       PM_ERR_NOCONTEXT
	      the current PMAPI context is invalid

Performance Co-Pilot							PCP							PMTRIMNAMESPACE(3)