Win32_Perf class

The base class for the performance counter classes Win32_PerfRawData and Win32_PerfFormattedData.

Win32_Perf defines the required timestamp and frequency properties used in the CounterType algorithms for the performance counter classes.

The following syntax is simplified from Managed Object Format (MOF) code and includes all of the inherited properties. Properties and methods are in alphabetic order, not MOF order.

Syntax

[abstract, AMENDMENT]
class Win32_Perf : CIM_StatisticalInformation
{
  string Caption;
  string Description;
  string Name;
  uint64 Frequency_Object;
  uint64 Frequency_PerfTime;
  uint64 Frequency_Sys100NS;
  uint64 Timestamp_Object;
  uint64 Timestamp_PerfTime;
  uint64 Timestamp_Sys100NS;
};

Members

The Win32_Perf class has these types of members:

• Properties

Properties

The Win32_Perf class has these properties.

Caption

Data type: string

Access type: Read-only

Qualifiers: MaxLen (64)

Short textual description for the statistic or metric.

This property is inherited from CIM_StatisticalInformation.

Description

Data type: string

Access type: Read-only

Textual description of the statistic or metric.

This property is inherited from CIM_StatisticalInformation.

Frequency_Object

Data type: uint64

Access type: Read-only

Frequency in ticks per second of the Timestamp_Object property. When sub-classed, the provider defines this property.

For more information about using uint64 values in scripts, see Scripting in WMI.

Frequency_PerfTime

Data type: uint64

Access type: Read-only

Frequency in ticks per second of the Frequency_PerfTime property. A value can be obtained by calling the Windows function QueryPerformanceCounter.

For more information about using uint64 values in scripts, see Scripting in WMI.

Frequency_Sys100NS

Data type: uint64

Access type: Read-only

Frequency in ticks per second of the Timestamp_Sys100NS property (10000000).

For more information about using uint64 values in scripts, see Scripting in WMI.

Name

Data type: string

Access type: Read-only

Qualifiers: MaxLen (256)

Label by which the statistic or metric is known. When subclassed, this property can be overridden to be a key property.

This property is inherited from CIM_StatisticalInformation.

Timestamp_Object

Data type: uint64

Access type: Read-only

Object-defined timestamp. The provider defines his property.

For more information about using uint64 values in scripts, see Scripting in WMI.

Timestamp_PerfTime

Data type: uint64

Access type: Read-only

High Performance counter timestamp. A value can be obtained by calling the Windows function QueryPerformanceCounter.

For more information about using uint64 values in scripts, see Scripting in WMI.

Timestamp_Sys100NS

Data type: uint64

Access type: Read-only

Timestamp value in 100 nanosecond units.

For more information about using uint64 values in scripts, see Scripting in WMI.

Remarks

The Win32_Perf class derives from CIM_StatisticalInformation.

Requirements

Requirement	Value
Minimum supported client	Windows Vista
Minimum supported server	Windows Server 2008
Namespace	Root\CIMV2
DLL	WmiPerfInst.dll

See also

CIM_StatisticalInformation

Performance Counter Classes

Accessing WMI Preinstalled Performance Classes

WMI Tasks: Performance Monitoring

Accessing Performance Data in Script