What is involved in fetching metrics from PMCD?
The following high-level description follows the interactions between a monitoring client and PMCD to fetch metrics periodically. • The monitoring client connects to PMCD and explores the Performance Metrics Name Space using pmGetChildren(3) or pmTraversePMNS(3) for either one-level at a time expansion or recursive expansion. • Once the client has the name(s) of the metrics of interest, pmLookupName(3) returns PMIDs and then pmLookupDesc(3) will return the descriptor for a metric. • For set-valued metrics, use the instance domain number from the metric descriptor, and the routines pmLookupInDom(3), pmGetInDom(3) and pmNameInDom(3) to browse the instance domain. Alternatively, ignore the instance domain and all instances will be returned. • See also pmLookupText(3) and pmLookupInDomText(3) for help text about metrics and instances (better suited for human consumption than interpretation by monitoring clients). • Repeat until bored: pmFetch(3); report; sleep; To see all of the gory detai
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