Differences
This shows you the differences between two versions of the page.
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litespeed_wiki:cache:cache-storage [2018/05/01 15:40] Lisa Clarke created |
litespeed_wiki:cache:cache-storage [2018/05/01 20:42] Lisa Clarke Fixed some inaccuracies & typos |
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| To answer that question, it's helpful to first define some terms: | To answer that question, it's helpful to first define some terms: | ||
| - | * **Cached Object**: A cache entry stored in LSCache. A cached object maps to a URL plus an optional variation. For example, if one URL has a desktop view and a mobile view, there will be two cached objects for that URL: one for each view. It can be a full page content or an ESI block content. | + | * **Cached Object**: A cache entry stored in LSCache. A cached object maps to a URL plus an optional variation. For example, if one URL has a desktop view and a mobile view, there will be two cached objects for that URL: one for each of those views. It can be full page content or ESI block content. |
| * **Cache Manager SHM**: Shared memory that cache manager uses to store all of the information about the cache entries. It is a memory-mapped file persistent to disk. You can point it to a RAM disk for faster access. Just keep in mind that the data on a RAM disk will be lost if your physical server reboots. (LSWS restart will not affect this.) | * **Cache Manager SHM**: Shared memory that cache manager uses to store all of the information about the cache entries. It is a memory-mapped file persistent to disk. You can point it to a RAM disk for faster access. Just keep in mind that the data on a RAM disk will be lost if your physical server reboots. (LSWS restart will not affect this.) | ||
| - | * **LRU**: Leased Recently Used cache replacement. | + | * **LRU**: Least Recently Used cache replacement. |
| Each cached object has a corresponding entry in the cache manager SHM. LSWS will check periodically (triggered by a timer) for expired cache entries based on the entries' defined TTLs. LSWS will select a list of entries based on LRU, and delete the related cache files on disk. Each time this happens, the batch size is small enough that it will not affect the whole server performance. The clean-up process is based on TTL only, it does not check for purge events. | Each cached object has a corresponding entry in the cache manager SHM. LSWS will check periodically (triggered by a timer) for expired cache entries based on the entries' defined TTLs. LSWS will select a list of entries based on LRU, and delete the related cache files on disk. Each time this happens, the batch size is small enough that it will not affect the whole server performance. The clean-up process is based on TTL only, it does not check for purge events. | ||
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| However, if you //do// want to remove the files yourself, you can delete your cache storage folder, or use our utility commands ''cleancache.sh'' and ''cleanlitemage.sh'', which can be found under ''lsws/admin/misc/''. | However, if you //do// want to remove the files yourself, you can delete your cache storage folder, or use our utility commands ''cleancache.sh'' and ''cleanlitemage.sh'', which can be found under ''lsws/admin/misc/''. | ||
| - | Never try to create the cache storage folder manually. If it's missing, LSWS will create it for you, in the path you have defined, assuming it has proper permission. | + | Never try to create the cache storage folder manually. If it's missing, LSWS will create it for you, in the path you have defined, assigning the proper permissions. |
| **NOTE**: If you delete the cache manager SHM file, you will have to restart LSWS. | **NOTE**: If you delete the cache manager SHM file, you will have to restart LSWS. | ||
| Learn more about [[litespeed_wiki:cache:no-plugin-setup-guidline#deleting_outdated_cache_files_through_cleancachesh_script|cleancache.sh]] and [[litespeed_wiki:cache:litemage:troubleshooting:clean-up|cleanlitemage.sh]]. | Learn more about [[litespeed_wiki:cache:no-plugin-setup-guidline#deleting_outdated_cache_files_through_cleancachesh_script|cleancache.sh]] and [[litespeed_wiki:cache:litemage:troubleshooting:clean-up|cleanlitemage.sh]]. | ||