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NAME | C SYNOPSIS | CAVEAT | DESCRIPTION | CONFIGURATION FILE | DIAGNOSTICS AND RETURN VALUES | SEE ALSO | COLOPHON |
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PMEQUIVINDOM(3) Library Functions Manual PMEQUIVINDOM(3)
__pmEquivInDom - check if two instance domains are equivalent
#include <pcp/pmapi.h>
#include <pcp/libpcp.h>
int __pmEquivInDom(pmInDom a, pmInDom b)
cc ... -lpcp
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 at some point in the future
they may not work or may provide different semantics.
Within the Performance Co-Pilot (PCP) each instance domain is
assigned a unique Instance Domain Identifier (pmInDom).
Internally a pmInDom is constructed from 2 fields: the domain
number (of the associated Performance Metrics Domain Agent, or
PMDA) and the serial number (assigned by the PMDA).
In some unusual circumstances different PMDAs may support
independent Instance Domains that are semantically equivalent,
e.g. per CPU or per process identifier. __pmEquivInDom provides
a mechanism to determine if Instance Domain a is equivalent to
Instance Domain b.
The ``equivalence'' of Instance Domains is defined by an external
configuration file, identified by the environment variable
$PCP_INDOM_CONFIG or $PCP_ETC_DIR/pcp/indom.config by default.
The format for the configuration file is defined in the
CONFIGURATION FILE section below.
If $PCP_INDOM_CONFIG is an empty string, no equivalence mapping
is loaded.
An Instance Domain equivalence mapping file conforms to the
folowing syntax:
1. Lines beginning with optional white space, followied by ``#''
are considered comments.
2. Blank lines are ignored.
3. Each remaining line defines one `equivalence map'' with a
list of white-space separated instance domains, each
consisting of a number (the domain number), a period ``.''
and a number (the serial number). As a special case to
``match all serial numbers'', the serial number part can be
``*''.
The format of a pmInDom demands that a domain number is in the
range 0 to 511, and a numeric serial number is in the range 0 to
4194303.
The return value is 1 if the Instance Domains are equivalent,
else 0 if they are not. In rare cases a return value of -1 is
used to indicate some problem (reported on standard error) in
opening or parsing the configuration file.
pmLookupInDom(3) and PMAPI(3).
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 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
man-pages@man7.org
Performance Co-Pilot PCP PMEQUIVINDOM(3)
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HTML rendering created 2023-12-22 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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