Cache garbage collection

Cache garbage collection for the proxy server discards expired files from the cache, freeing space to cache files for new requests. Garbage collection is triggered automatically when the amount of used space in the cache reaches an administrator-specified limit called the high water mark and continues until the amount of used space reaches a low water mark.

Because the garbage collection routine uses minimal CPU resources and does not affect the availability of unexpired cached material, configuring garbage collection to run at specific times is not necessary.

To improve the performance of garbage collection, you can set the high water mark and low water mark. You can also configure the type of algorithm used for garbage collection. See Garbage collection for more information on modifying garbage collection.