PMDERIVEDCONTROL - Online Linux Manual PageSection : 3
Updated :
Source : Performance Co-Pilot

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NAMEpmGetDerivedControl, pmSetDerivedControl − get and set controls for derived metrics

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C SYNOPSIS#include <pcp/pmapi.h> int pmGetDerivedControl(int what, int *valuep);
int pmSetDerivedControl(int what, int value); cc ... −lpcp

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DESCRIPTIONThese 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: 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 expression. 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).

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RETURN VALUESBoth routines return 0 on success, else a value less than 0 that can be decoded using pmErrStr(3).

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SEE ALSOPCPIntro(1), pmAddDerived(3), pmAddDerivedMetric(3), PMAPI(3), pmErrStr(3), pmLoadDerivedConfig(3), pmRegisterDerived(3), pmRegisterDerivedMetric(3) and PMNS(5). 0

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