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NAME | C SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | COLOPHON |
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PMDERIVEDCONTROL(3) Library Functions Manual PMDERIVEDCONTROL(3)
pmGetDerivedControl, pmSetDerivedControl - get and set controls
for derived metrics
#include <pcp/pmapi.h>
int pmGetDerivedControl(int what, int *valuep);
int pmSetDerivedControl(int what, int value);
cc ... -lpcp
These routines may be used to influence the behaviour of the de‐
rived metric services that are activated for global derived met‐
rics using pmRegisterDerived(3), pmRegisterDerivedMetric(3) and
pmLoadDerivedConfig(3), or per-context derived metrics using
pmAddDerived(3) and pmAddDerivedMetric(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:
PCP_DERIVED_GLOBAL_LIMIT
The maximum number of global derived metrics that may be
defined. The value -1 indicates no limit.
PCP_DERIVED_CONTEXT_LIMIT
The maximum number of per-context derived metrics that may
be defined. The value -1 indicates no limit.
PCP_DERIVED_DEBUG_SYNTAX
Debug diagnostics during parsing of derived metric expres‐
sion. The value 1 enables the diagnostics, the value 0
disables them.
PCP_DERIVED_DEBUG_SEMANTICS
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.
PCP_DERIVED_DEBUG_EVAL
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).
Both routines return 0 on success, else a value less than 0 that
can be decoded using pmErrStr(3).
PCPIntro(1), pmAddDerived(3), pmAddDerivedMetric(3), PMAPI(3),
pmErrStr(3), pmLoadDerivedConfig(3), pmRegisterDerived(3),
pmRegisterDerivedMetric(3) and PMNS(5).
This page is part of the PCP (Performance Co-Pilot) project. In‐
formation 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
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-08-11.) 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 PMDERIVEDCONTROL(3)
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HTML rendering created 2025-09-06 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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