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43 lines
1.8 KiB
Markdown
43 lines
1.8 KiB
Markdown
---
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title: WindowsMemoryPagingHigh
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---
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## Meaning
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The rate of pages read from or written to disk to resolve hard page faults,
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`windows:memory_swap_page_operations:rate`, exceeds the configured threshold
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for 15 minutes. The default is 1000 pages per second. The counter counts
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pagefile traffic and memory-mapped file I/O alike.
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## Impact
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The host is short of physical memory and uses the disk as backing store, so
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every affected process slows down to disk speed. Sustained paging also
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competes with application I/O on the system disk.
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## Diagnosis
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1. Inspect the paging rate together with `windows:memory_usage:ratio`,
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`windows_memory_available_bytes` and `windows:memory_committed:ratio`. Low
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available memory confirms memory pressure; a high rate with ample memory
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points at a process reading a large memory-mapped file, such as a backup or
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an index rebuild.
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2. Split the rate into reads and writes with
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`windows_memory_swap_page_reads_total` and
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`windows_memory_swap_page_writes_total`. Reads dominate when the working
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sets of processes do not fit; writes dominate when the system trims and
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writes modified pages.
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3. Find the processes with the largest working sets and page fault rates in
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Resource Monitor or, with the `process` collector enabled, with
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`windows_process_working_set_private_bytes` and
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`windows_process_page_faults_total`.
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4. Check `windows_memory_standby_cache_lifetime_seconds`; a low lifetime means
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cached pages are repurposed quickly, another sign of memory pressure.
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## Mitigation
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Stop or move the process that uses the memory, fix a memory leak, or add
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physical memory. Move large sequential file jobs off peak hours when they cause
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the paging. Confirm the paging rate drops and available memory recovers. Raise
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the threshold on hosts whose workload maps large files by design.
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