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pmtrimnamespace(3) [centos man page]

PMTRIMNAMESPACE(3)					     Library Functions Manual						PMTRIMNAMESPACE(3)

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)

Check Out this Related Man Page

PMNSDEL(1)						      General Commands Manual							PMNSDEL(1)

pmnsdel - delete a subtree of names from the Performance Co-Pilot PMNS SYNOPSIS
$PCP_BINADM_DIR/pmnsdel [-d] [-n namespace] metricpath [ ... ] DESCRIPTION
pmnsdel removes subtrees of names from a Performance Metrics Name Space (PMNS), as used by the components of the Performance Co-Pilot (PCP). Normally pmnsdel operates on the default Performance Metrics Namespace (PMNS), however if the -n option is specified an alternative names- pace is used from the file namespace. The default 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 PMNS. The metric names to be deleted are all those for which one of the metricpath arguments is a prefix in the PMNS, see pmns(5). All of the files defining the PMNS must be located within the directory that contains the root of the PMNS, and this would typically be $PCP_VAR_DIR/pmns for the default PMNS, and this would typically imply running pmnsdel as root. Provided some initial integrity checks are satisfied, pmnsdel will update the necessary PMNS files. Should an error be encountered the original namespace is restored. Note that any PMNS files that are no longer referenced by the modified namespace will not be removed, even though their contents are not part of the new namespace. The -d option allows the resultant PMNS to optionally contain duplicate PMIDs with different names in the PMNS. By default this condition is considered an error. CAVEAT
Once the writing of the new namespace file has begun, the signals SIGINT, SIGHUP and SIGTERM will be ignored to protect the integrity of the new files. FILES
$PCP_VAR_DIR/pmns/root the default PMNS, when then 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 configura- tion file, as described in pcp.conf(5). SEE ALSO
pmnsadd(1), pmnsmerge(1), pcp.conf(5), pcp.env(5) and pmns(5). Performance Co-Pilot PCP PMNSDEL(1)
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