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Using the PDH Functions to Consume Counter Data

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Use the PDH functions to collect performance data. The PDH functions are easier to use than the registry functions and can be used to access counter data both V1 and V2 providers. PDH has APIs for collecting current performance data, saving performance data to log files, and reading data from log files.

Note

You cannot use the Performance Data Helper abstraction-layer functions if you are writing Windows OneCore apps. Instead, use PerfLib V2 Consumer functions.

PDH is a high-level API that simplifies collecting performance counter data. It helps with query parsing, metadata caching, matching up instances between samples, computing formatted values from raw values, reading data from log files, and saving data to log files. PDH automatically uses the registry functions when collecting data from V1 providers and it uses the V2 Consumer functions when collecting data from V2 providers.

To collect performance data using the PDH functions, perform the following steps.

  1. Create a query
  2. Add counters to the query
  3. Collect the performance data
  4. Display the performance data
  5. Close the query

You can collect performance data from either real-time sources or log files. For more information on how to write performance data to log files, see Working with Log Files.

See also