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40 lines
1.6 KiB
Markdown
40 lines
1.6 KiB
Markdown
# `pagefile` collector
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The collector reads the multi-instance PDH object `Paging File` with
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`pdh.CounterTypeRaw`. The object exists on every Windows host with a page
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file, so no role is needed. It also uses `GetPerformanceInfo` for the page
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size. The file size comes from the `% Usage` base (size in pages), not from
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`os.Stat`; a file with a base of 0 or a usage outside `[0, base]` is skipped.
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These notes were recorded on Windows Server 2025 (build 26100) with one page
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file.
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- Instances are the page file paths, here `C:\pagefile.sys`, plus `_Total`.
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`_Total` is dropped because the collector does not request it. The
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instance name had no `\??\` prefix on this host. The `file` label is the
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instance name with any `\??\` prefix removed.
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- `% Usage` and `% Usage Peak` are `PERF_RAW_FRACTION`. Despite the `%`, the
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raw value is the number of pages in use (a gauge) and the base
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(`,secondvalue`) is the page file size in pages. With 4096-byte pages, the
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base 622592 matched the file size of 2550136832 bytes on disk and
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the 2432 MB `AllocatedBaseSize` of `Win32_PageFileUsage`.
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- `% Usage` was 128462 pages in the dump and 0 in a later live sample.
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## Counter reference
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Recorded on Windows Server 2025 (build 26100). `Raw` and `Base` are the first and second
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values that `pdh.CounterTypeRaw` returns for the sample instance.
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### `Paging File`
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Multi-instance. Instances: `_Total`, `C:\pagefile.sys`. Sample instance: `C:\pagefile.sys`.
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Counters the collector reads:
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| Counter | Type | Raw | Base |
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|---|---|---|---|
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| `% Usage` | `PERF_RAW_FRACTION` | 128462 | 622592 |
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Not read by the collector:
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- `PERF_RAW_FRACTION`: `% Usage Peak`
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