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PMNSMERGE(1) General Commands Manual PMNSMERGE(1)


pmnsmerge - merge multiple versions of a Performance Co-Pilot PMNS


$PCP_BINADM_DIR/pmnsmerge [-adfxv] infile [...] outfile


pmnsmerge merges multiple instances of a Performance Metrics Name Space (PMNS), as used by the components of the Performance Co-Pilot (PCP).

Each infile argument names a file that includes the root of a PMNS, of the form

root {

/* arbitrary stuff */ }

The order in which the infile files are processed is determined by the presence or absence of embedded control lines of the form


Files without a control line are processed first and in the order they appear on the command line. The other files are then processed in order of ascending _DATESTAMP.

The -a option suppresses the argument re-ordering and processes all files in the order they appear on the command line.

The merging proceeds by matching names in PMNS, only those new names in each PMNS are considered, and these are added after any existing metrics with the longest possible matching prefix in their names. For example, merging these two input PMNS

root {                    root {

surprise 1:1:3
mine 1:1:1 mine 1:1:1
foo foo
yours 1:1:2 } } foo { foo {
fumble 1:2:1
mumble 1:2:3
stumble 1:2:2 stumble 1:2:2 } }
yawn {
sleepy 1:3:1

Produces the resulting PMNS in out.

root {

mine 1:1:1
yours 1:1:2
surprise 1:1:3
yawn } foo {
fumble 1:2:1
stumble 1:2:2
mumble 1:2:3 } yawn {
sleepy 1:3:1 }

To avoid accidental over-writing of PMNS files, outfile is expected to not exist when pmnsmerge starts. The -f option allows an existing outfile to be unlinked (if possible) and truncated before writing starts.

Normally duplicate names for the same Performance Metric Identifier (PMID) in a PMNS are allowed. The -d option is the default option and is included for backwards compatibility. The -x option reverses the default and pmnsmerge will report an error and exit with a non-zero status if a duplicate name is found for a PMID in any of the input PMNS files or in the merged output PMNS.

The -v option produces one line of diagnostic output as each infile is processed.

Once all of the merging has been completed, pmnsmerge will attempt to load the resultant namespace using pmLoadASCIINameSpace(3) - if this fails for any reason, outfile will still be created, but pmnsmerge will report the problem and exit with non-zero status.

Using pmnsmerge with a single input argument allows that PMNS file to be checked. In addition to syntactic checking, specifying -x will also enable a check for duplicate names for all PMIDs.


The available command line options are:

Process files in command line order.
Allow duplicate metric names per PMID. This is the default.
Overwrite output file if it already exists.
Verbose input processing.
Do not allow duplicate metric names per PMID.
-?, --help
Display usage message and exit.


Once the writing of the new outfile file has begun, the signals SIGINT, SIGHUP and SIGTERM will be ignored to protect the integrity of the new file.


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).


pmnsadd(1), pmnsdel(1), pmLoadASCIINameSpace(3), pcp.conf(5), pcp.env(5) and PMNS(5).

PCP Performance Co-Pilot