40 Polling and File Change Notification Many applications respond to file and directory changes A poorly written application will poll for changes A w
{"Image DocumentName": "Polling and File Change Notification", "Image ImageDescription": "Many applications respond to file and directory changes. A poorly written application will poll for changes. A well-written application will request notification by the system of changes. Polling for changes causes performance degradation. Context switches including TLB flush. Cache invalidation. Physical memory usage. CPU usage. Alternative: file change notification. When you run Filemon on an idle system you should only see bursty system background activity. Polling is visible as periodic accesses to the same files and directories. File change notification is visible as directory queries that have no result.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}