pmstore(3) — Linux manual page


PMSTORE(3)              Library Functions Manual              PMSTORE(3)

NAME         top

       pmStore - modify values of performance metrics

C SYNOPSIS         top

       #include <pcp/pmapi.h>

       int pmStore(const pmResult *result);

       cc ... -lpcp

DESCRIPTION         top

       In some special cases it may be helpful to modify the current
       values of performance metrics, e.g. to reset a counter to zero,
       or to modify a ``metric'' which is a control variable for some
       agent collecting performance metrics.

       The routine pmStore is a lightweight inverse of pmFetch(3).

       The caller must build the pmResult data structure (of course,
       this could have been returned from an earlier pmFetch(3) call)
       and then call pmStore.

       It is an error to pass a request to pmStore in which the numval
       field within any of the pmValueSet structure has a value less
       than one.

       The current Performance Metrics Application Programming Interface
       (PMAPI) context must be one with a host as the source of metrics,
       and the current value of the nominated metrics will be changed,
       i.e.  pmStore cannot be used to make retrospective changes to
       information in either the archive logs, or in the recent past for
       real-time sources of metrics.

       The return code from pmStore is zero for success.

DIAGNOSTICS         top

              At least one of the modifications was rejected.  No other
              status is available from below the PMAPI (this is the
              lightweight part of the functionality!).  In cases where
              the outcome of pmStore for individual metrics is
              important, the caller should make one call to pmStore for
              each metric. On the other hand, a bulk modification can be
              performed in a single pmStore call for situations in which
              the outcome is not critical.

              The current PMAPI context is an archive rather than a
              host, or it is a host that is not set to the current time,
              i.e. has been ``rewound'' to the recent past using

              The number of metrics specified in result is less than

              One or more of the pmValueSets in result has a numval
              field with a value less than one.

SEE ALSO         top

       PMAPI(3), pmFetch(3) and pmSetMode(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 2021-08-27.
       (At that time, the date of the most recent commit that was found
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       (which is not part of the original manual page), send a mail to

Performance Co-Pilot               PCP                        PMSTORE(3)

Pages that refer to this page: pmdagfs2(1)pmdaoracle(1)pmdapipe(1)pmdaproc(1)pmstore(1)pmval(1)pcpintro(3)pmdastore(3)pmwebapi(3)