The set of instances for performance metrics returned from a
pmFetch(3) call may be filtered or restricted using an instance
profile. There is one instance profile for each context the
application creates at the Performance Metrics Application
Programming Interface (PMAPI), and each instance profile may include
instances from one or more instance domains (see pmLookupDesc(3)).
pmDelProfile may be used to delete instance specifications from the
instance profile of the current PMAPI context.
In the simplest variant, the list of instances identified by the
instlist argument for the indom instance domain are removed from the
instance profile. The list of instance identifiers contains numinst
The indom value would normally be extracted from a call to
pmLookupDesc(3) for a particular performance metric, and the
instances in instlist would typically be determined by calls to
pmGetInDom(3) or pmLookupInDom(3).
If indom equals PM_INDOM_NULL or numinst is zero, then all instance
domains are selected for deletion. If instlist is NULL, then all
instances in the selected domain(s) are removed from the profile.
To disable all available instances in all domains, use
pmDelProfile(PM_INDOM_NULL, 0, NULL). This is the only situation in
which indom may be PM_INDOM_NULL.
It is possible to delete non-existent instance domains and non-
existent instances from an instance profile. None of the routines
that use the instance profile will ever issue an error if you do
this. The cost of checking, when checking is possible, outweighs any
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Performance Co-Pilot PCP PMDELPROFILE(3)