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pmfetcharchive(3)

NAME

   pmFetchArchive - get performance metrics directly from a set if archive
   logs

C SYNOPSIS

   #include <pcp/pmapi.h>

   int pmFetchArchive(pmResult **result);

   cc ... -lpcp

DESCRIPTION

   pmFetchArchive is a variant of pmFetch(3) that may only  be  used  when
   the  current  Performance  Metrics  Application  Programming  Interface
   (PMAPI) context is associated with a set of archive logs.

   The result is instantiated with all of the metrics (and instances) from
   the  next  archive record, consequently there is no notion of a list of
   desired metrics, and the instance  profile  of  the  PMAPI  context  is
   ignored.

   pmFetchArchive may return a result in which numpmid is zero.  This is a
   <mark> record that indicates  a  temporal  discontinuity  in  the  time
   series of performance metrics.  This can happen at the boundary between
   archive logs in a set or if the archive log associated with the current
   PMAPI  context  was created using pmlogextract(1) to concatenate two or
   more PCP archive logs, and the <mark> record  marks  a  point  in  time
   between  the  end  of one input archive and the start of the next input
   archive.

   It is expected that pmFetchArchive would be used  to  create  utilities
   that  scan  sets  of  archive logs, while the more common access to the
   archives would be via the pmFetch(3) interface.

   To skip records within the set of archive  logs,  use  pmSetMode(3)  to
   change  the collection time within the current PMAPI context, then call
   pmFetchArchive.

   Note  that  the  result  returned  by  pmFetchArchive  is   dynamically
   allocated,  and  must  be  released using pmFreeResult(3), not free(3).
   See pmFetch(3) and pmFreeResult(3) for further details.

   pmFetchArchive returns zero on success.

SEE ALSO

   PMAPI(3), pmFetch(3),  pmFreeResult(3),  pmNewContext(3),  pmSetMode(3)
   and pmTrimNameSpace(3).

DIAGNOSTICS

   PM_ERR_NOTARCHIVE
          the  current  PMAPI  context  is  not  associated  with a set of
          archive logs



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