These routines may be used to influence the behaviour of the
derived metric services that are activated for global derived
metrics using pmRegisterDerived(3), pmRegisterDerivedMetric(3)
and pmLoadDerivedConfig(3), or per-context derived metrics using
pmAddDerived(3) and pmAddDerivedDerived(3).
The what argument selects a control, the value argument provides
a value for pmSetDerivedControl and the valuep argument is used
to return the value for pmGetDerivedControl.
The what argument has one of the following values:
The maximum number of global derived metrics that may be
defined. The value -1 indicates no limit.
The maximum number of per-context derived metrics that may
be defined. The value -1 indicates no limit.
Debug diagnostics during parsing of derived metric
expression. The value 1 enables the diagnostics, the
value 0 disables them.
Debug diagnostics for semantic checks during the binding
of metrics in the derived metric expression to the
available metrics in a new PMAPI context. The value 1
enables the diagnostics, the value 0 disables them.
Debug diagnostics when derived metrics are used in PMAPI
operations like pmFetch(3), pmGetChildren(3),
pmGetChildrenStatus(3), pmLookupDesc(3), pmLookupName(3),
pmNameAll(3), pmNameID(3) and pmTraversePMNS(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 firstname.lastname@example.org. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2021-08-27.
(At that time, the date of the most recent commit that was found
in the repository was 2021-08-27.) 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 PMDERIVEDCONTROL(3)