pmasameindom(3) — Linux manual page


PMASAMEINDOM(3)         Library Functions Manual         PMASAMEINDOM(3)

NAME         top

       pmaSameInDom - check if two observations of an instance domain
       are the same`

C SYNOPSIS         top

       #include <pcp/pmapi.h>
       #include <pcp/libpcp.h>
       #include <pcp/archive.h>

       int pmaSameInDom(__pmLogInDom *old, __pmLogInDom *new);

       cc ... -lpcp_archive -lpcp

CAVEAT         top

       This documentation is intended for internal Performance Co-Pilot
       (PCP) developer use.

       These interfaces are not part of the PCP APIs that are guaranteed
       to remain fixed across releases, and they may not work, or may
       provide different semantics at some point in the future.

DESCRIPTION         top

       Checks two observations of the same instance domain are
       identical.  The code assumes (a) old->indom == new->indom and (b)
       both the instance domains are sorted in ascending internal
       instance identifier sequence; see pmaSortInDom(3) to see how to
       make the second condition true.

       pmaSameInDom returns 1 if they are the same, returns 0 otherwise.

       The instance domains are considered different if any of the
       following hold:

       1.  old->numinst != new->numinst

       2.  For some i, old->instlist[i] != new->instlist[i]

       3.  For some i, the strings pointed to by old->namelist[i] and
           new->instlist[i] are not identical

       For Version 3 archives with "delta indom" support, it is more
       likely that pmaDeltaInDom(3) is more useful than pmaSameInDom, as
       the former combines the check for two observations of an instance
       domain being the same with the optional creation of the "delta
       indom" format if that is the most efficient encoding.

SEE ALSO         top

       pmaDeltaInDom(3), PMAPI(3) and pmaSortInDom(3).

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 2023-12-22.
       (At that time, the date of the most recent commit that was found
       in the repository was 2023-12-16.)  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                   PMASAMEINDOM(3)

Pages that refer to this page: pmadeltaindom(3)