pmtraversepmns(3) [centos man page]

PMTRAVERSEPMNS(3)					     Library Functions Manual						 PMTRAVERSEPMNS(3)

NAME

       pmTraversePMNS, pmTraversePMNS_r - traverse the performance metrics name space

C SYNOPSIS

       #include <pcp/pmapi.h>

       int pmTraversePMNS(const char *name, void (*dometric)(const char *));
       int pmTraversePMNS_r(const char *name, void (*dometric_r)(const char *, void *), void *closure);

       cc ... -lpcp

DESCRIPTION

       The routine pmTraversePMNS may be used to perform a depth-first traversal of the Performance Metrics Name Space (PMNS).

       The  traversal  starts at the node identified by name - if name is an empty string (i.e. ""), the traversal starts at the root of the PMNS.
       Usually name would be the pathname of a non-leaf node in the PMNS.

       For each leaf node (i.e. performance metric) found in the traversal, the user-supplied routine dometric is called with the full pathname of
       that  metric  in  the PMNS as the single argument.  This argument is null-byte terminated, and is constructed from a buffer that is managed
       internally to pmTraversePMNS.  Consequently the value is only valid during the call to dometric - if the pathname needs to be retained,	it
       should be copied using strdup(3C) before returning from dometric.

       The pmTraversePMNS_r routine performs the same function, except the callback method func_r has an additional parameter that will be closure
       from the initial call to pmTraversePMNS_r.  The additional parameter to pmTraversePMNS_r and the callback method allows the caller to  pass
       context	through pmTraversePMNS_r and into the callback method func_r, making the service more useful for multi-threaded applications where
       thread-private data can be accessed in the callback method via the closure argument.

       On success pmTraversePMNS returns the number of children of name, which may be zero.

SEE ALSO

       PMAPI(3) and pmGetChildren(3).

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 pmTraversePMNS must be made inside a current context.

       PM_ERR_NAME
	      The initial pathname name is not valid in the current PMNS.

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

Performance Co-Pilot							PCP							 PMTRAVERSEPMNS(3)

Check Out this Related Man Page

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)

Linux and UNIX Man Pages

pmtraversepmns(3) [centos man page]

Check Out this Related Man Page