ClockType enumeration (pla.h)

Defines the clock resolution to use when tracing events.

Syntax

typedef enum __MIDL___MIDL_itf_pla_0001_0043_0005 {
  plaTimeStamp = 0,
  plaPerformance = 1,
  plaSystem = 2,
  plaCycle = 3
} ClockType;

Constants

plaTimeStamp Value: 0 Use the raw (unconverted) time stamp.
plaPerformance Value: 1 Query performance counter. This counter provides a high-resolution (100 nanoseconds) time stamp but is more resource-intensive to retrieve than system time.
plaSystem Value: 2 System time. The system time provides a low-resolution (10 milliseconds) time stamp but is less resource-intensive to retrieve than the query performance counter.
plaCycle Value: 3 CPU cycle counter. The CPU counter provides the highest resolution time stamp and is the least resource-intensive to retrieve. However, the CPU counter is unreliable and should not be used in production.

Remarks

For details, see the ClientContext member of the WNODE_HEADER structure.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Header	pla.h

See also

ITraceDataCollector::ClockType