pmnsmerge(1)
NAME
pmnsmerge - merge multiple versions of a Performance Co-Pilot PMNS
SYNOPSIS
$PCP_BINADM_DIR/pmnsmerge [-adfxv] infile [...] outfile
DESCRIPTION
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 #define
_DATESTAMP YYYYMMDD
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
yawn
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
foo
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.
CAVEAT
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.
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).
SEE ALSO
pmnsadd(1), pmnsdel(1), pmLoadASCIINameSpace(3), pcp.conf(5), pcp.env(5) and pmns(5).
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