Путеводитель по Руководству Linux

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   pmHighResFetch    ( 3 )

получить значения показателей производительности (get performance metric values)

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Окружение (Environment)

Many of the performance metrics exported from PCP agents have the semantics of counter meaning they are expected to be monotonically increasing. Under some circumstances, one value of these metrics may be smaller than the previously fetched value. This can happen when a counter of finite precision overflows, or when the PCP agent has been reset or restarted, or when the PCP agent is exporting values from some underlying instrumentation that is subject to some asynchronous discontinuity. The environment variable PCP_COUNTER_WRAP may be set to indicate that all such cases of a decreasing ``counter'' should be treated as a counter overflow, and hence the values are assumed to have wrapped once in the interval between consecutive samples. This ``wrapping'' behavior was the default in earlier PCP versions, but by default has been disabled in PCP version 1.3 and later.