An application using the Performance Metrics Application Programming
Interface (PMAPI) may manipulate several concurrent contexts, each
associated with a source of performance metrics, e.g. pmcd(1) on some
host, or an archive log of performance metrics as created by
pmWhichContext returns a handle for the current PMAPI context, that
may be used in the associated PMAPI routines that require a handle to
identify a PMAPI context.
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Performance Co-Pilot PCP PMWHICHCONTEXT(3)