pmnsmerge(1) — Linux manual page


PMNSMERGE(1)             General Commands Manual            PMNSMERGE(1)

NAME         top

       pmnsmerge - merge multiple versions of a Performance Co-Pilot

SYNOPSIS         top

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

DESCRIPTION         top

       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
                     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
                 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

       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.

OPTIONS         top

       The available command line options are:

       -a   Process files in command line order.

       -d, --dupok
            Allow duplicate metric names per PMID.  This is the default.

       -f, --force
            Overwrite output file if it already exists.

       -v, --verbose
            Verbose input processing.

       -x, --nodups
            Do not allow duplicate metric names per PMID.

       -?, --help
            Display usage message and exit.

CAVEATS         top

       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

SEE ALSO         top

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

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       project's upstream Git repository
       ⟨⟩ on 2024-06-14.
       (At that time, the date of the most recent commit that was found
       in the repository was 2024-06-14.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Performance Co-Pilot               PCP                      PMNSMERGE(1)

Pages that refer to this page: pmnsadd(1)pmnscomp(1)pmnsdel(1)