pmistart(3) — Linux manual page

PMISTART(3)              Library Functions Manual             PMISTART(3)

NAME         top

       pmiStart - establish a new LOGIMPORT context

C SYNOPSIS         top

       #include <pcp/pmapi.h>
       #include <pcp/import.h>

       int pmiStart(const char *archive, int inherit);

       cc ... -lpcp_import -lpcp

Perl SYNOPSIS         top

       use PCP::LogImport;

       pmiStart($archive, $inherit);

DESCRIPTION         top

       As part of the Performance Co-Pilot Log Import API (see
       LOGIMPORT(3)), pmiStart creates a new context.  Each context
       maintains the following state and metadata:

       •  The base name (archive) for the physical  files that constitute
          the output PCP archive.

       •  The source hostname for the data that will be written to the
          PCP archive.  Defaults to the hostname of the localhost, but
          can be set using pmiSetHostname(3).

       •  The source timezone for the PCP archive.  Defaults to the
          timezone of the localhost, but can be set using
          pmiSetTimezone(3).

       •  The output archive version number for the PCP archive.
          Defaults to the traditional version 2 format, but can be set
          using pmiSetVersion(3).

       •  Metrics and instance domains, as defined by pmiAddMetric(3).

       •  Instances for each instance domain, as defined by
          pmiAddInstance(3).

       •  Handles as defined by pmiGetHandle(3).  Each handle is a
          metric-instance pair, and each metric-instance pair may have an
          associated value in each record written to the output PCP
          archive.

       •  An optional set of data values for one or more metric-instance
          pairs (ready for the next record to be written to the output
          PCP archive) as defined by calls to pmiPutValue(3) or
          pmiPutValueHandle(3).

       If inherit is true, then the new context will inherit any and all
       metadata (metrics, instance domains, instances and handles) from
       the current context, otherwise the new context is created with no
       metadata.  The basename for the output PCP archive, the source
       hostname, the source timezone and any data values from the current
       context are not inherited.  If this is the first call to pmiStart
       the metadata will be empty independent of the value of inherit.

       Since no physical files for the output PCP archive will be created
       until the first call to pmiWrite(3) or pmiPutResult(3), archive
       could be NULL to create a convenience context that is populated
       with metadata to be inherited by subsequent contexts.

       The return value is a context identifier that could be used in a
       subsequent call to pmUseContext(3) and the new context becomes the
       current context which persists for all subsequent calls up to
       either another pmiStart call or a call to pmiUseContext(3) or a
       call to pmiEnd(3).

DIAGNOSTICS         top

       It is an error if the physical files archive.0 and/or
       archive.index and/or archive.meta already exist, but this is not
       discovered until the first attempt is made to output some data by
       calling pmiWrite(3) or pmiPutResult(3), so pmiStart always returns
       a positive context identifier.

SEE ALSO         top

       LOGIMPORT(3), PMAPI(3), pmiAddInstance(3), pmiAddMetric(3),
       pmiEnd(3), pmiErrStr(3), pmiGetHandle(3), pmiPutLabel(3),
       pmiPutResult(3), pmiPutText(3), pmiPutValue(3),
       pmiPutValueHandle(3), pmiSetHostname(3), pmiSetTimezone(3),
       pmiSetVersion(3), pmiUseContext(3) and pmiWrite(3).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
       ⟨http://www.pcp.io/⟩.  If you have a bug report for this manual
       page, send it to pcp@groups.io.  This page was obtained from the
       project's upstream Git repository
       ⟨https://github.com/performancecopilot/pcp.git⟩ on 2025-02-02.
       (At that time, the date of the most recent commit that was found
       in the repository was 2025-01-30.)  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
       man-pages@man7.org

Performance Co-Pilot                                          PMISTART(3)

Pages that refer to this page: logimport(3),  pmiend(3),  pmisethostname(3),  pmisettimezone(3),  pmisetversion(3),  pmiusecontext(3)

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