collector.cache.md

cache collector

The cache collector exposes metrics about file system cache

Metric name prefix	cache
Data Source	Perflib
Classes	Win32_PerfFormattedData_PerfOS_Cache
Enabled by default?	No

Flags

None

Metrics

Name	Description	Type	Labels
windows_cache_async_copy_reads_total	Number of times that a filesystem, such as NTFS, maps a page of a file into the file system cache to read a page.	counter	None
windows_cache_async_data_maps_total	Number of times that a filesystem, such as NTFS, maps a page of a file into the file system cache to read the page, and wishes to wait for the page to be retrieved if it is not in main memory.	counter	None
windows_cache_async_fast_reads_total	Number of reads from the file system cache that bypass the installed file system and retrieve the data directly from the cache.	counter	None
windows_cache_async_mdl_reads_total	Number of reads from the file system cache that use a Memory Descriptor List (MDL) to access the pages.	counter	None
windows_cache_async_pin_reads_total	Number of reads from the file system cache preparatory to writing the data back to disk. Pages read in this fashion are pinned in memory at the completion of the read.	counter	None
windows_cache_copy_read_hits_total	Number of copy read requests that hit the cache, that is, they did not require a disk read in order to provide access to the page in the cache.	counter	None
windows_cache_copy_reads_total	Number of reads from pages of the file system cache that involve a memory copy of the data from the cache to the application's buffer.	counter	None
windows_cache_data_flushes_total	Number of times the file system cache has flushed its contents to disk as the result of a request to flush or to satisfy a write-through file write request.	counter	None
windows_cache_data_flush_pages_total	Number of pages the file system cache has flushed to disk as a result of a request to flush or to satisfy a write-through file write request.	counter	None
windows_cache_data_map_hits_total	Number of data maps in the file system cache that could be resolved without having to retrieve a page from the disk, because the page was already in physical memory.	counter	None
windows_cache_data_map_pins_total	Number of data maps in the file system cache that resulted in pinning a page in main memory, an action usually preparatory to writing to the file on disk.	counter	None
windows_cache_data_maps_total	Number of times that a file system such as NTFS, maps a page of a file into the file system cache to read the page.	counter	None
windows_cache_dirty_pages	Number of dirty pages on the system cache.	gauge	None
windows_cache_dirty_page_threshold	Threshold for number of dirty pages on system cache.	gauge	None
windows_cache_fast_read_not_possibles_total	Number of attempts by an Application Program Interface (API) function call to bypass the file system to get to data in the file system cache that could not be honored without invoking the file system.	counter	None
windows_cache_fast_read_resource_misses_total	Number of cache misses necessitated by the lack of available resources to satisfy the request.	counter	None
windows_cache_fast_reads_total	Number of reads from the file system cache that bypass the installed file system and retrieve the data directly from the cache.	counter	None
windows_cache_lazy_write_flushes_total	Number of Lazy Write flushes the Lazy Writer thread has written to disk. Lazy Writing is the process of updating the disk after the page has been changed in memory, so that the application that changed the file does not have to wait for the disk write to be complete before proceeding.	counter	None
windows_cache_lazy_write_pages_total	Number of Lazy Write pages the Lazy Writer thread has written to disk. Lazy Writing is the process of updating the disk after the page has been changed in memory, so that the application that changed the file does not have to wait for the disk write to be complete before proceeding.	counter	None
windows_cache_mdl_read_hits_total	Number of Memory Descriptor List (MDL) Read requests to the file system cache that hit the cache, i.e., did not require disk accesses in order to provide memory access to the page(s) in the cache.	counter	None
windows_cache_mdl_reads_total	Number of reads from the file system cache that use a Memory Descriptor List (MDL) to access the data.	counter	None
windows_cache_pin_read_hits_total	Number of pin read requests that hit the file system cache, i.e., did not require a disk read in order to provide access to the page in the file system cache. While pinned, a page's physical address in the file system cache will not be altered.	counter	None
windows_cache_pin_reads_total	Number of reads into the file system cache preparatory to writing the data back to disk. Pages read in this fashion are pinned in memory at the completion of the read. While pinned, a page's physical address in the file system cache will not be altered.	counter	None
windows_cache_read_aheads_total	Number of reads from the file system cache in which the Cache detects sequential access to a file. The read aheads permit the data to be transferred in larger blocks than those being requested by the application, reducing the overhead per access.	counter	None
windows_cache_sync_copy_reads_total	Number of reads from pages of the file system cache that involve a memory copy of the data from the cache to the application's buffer. The file system will not regain control until the copy operation is complete, even if the disk must be accessed to retrieve the page.	counter	None
windows_cache_sync_data_maps_total	Number of times that a file system such as NTFS maps a page of a file into the file system cache to read the page.	counter	None
windows_cache_sync_fast_reads_total	Number of reads from the file system cache that bypass the installed file system and retrieve the data directly from the cache. If the data is not in the cache, the request (application program call) will wait until the data has been retrieved from disk.	counter	None
windows_cache_sync_mdl_reads_total	Number of reads from the file system cache that use a Memory Descriptor List (MDL) to access the pages. If the accessed page(s) are not in main memory, the caller will wait for the pages to fault in from the disk.	counter	None
windows_cache_sync_pin_reads_total	Number of reads into the file system cache preparatory to writing the data back to disk. The file system will not regain control until the page is pinned in the file system cache, in particular if the disk must be accessed to retrieve the page.	counter	None

Example metric

Percentage of copy reads that hit the cache

windows_cache_copy_read_hits_total / windows_cache_copy_reads_total * 100

Useful queries

This collector does not yet have any useful queries added, we would appreciate your help adding them!

Alerting examples

This collector does not yet have alerting examples, we would appreciate your help adding them!