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Apache HTTP Server Version 2.0
Apache Module mod_mem_cache
Summary
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This module is experimental. Documentation is still under development...
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mod_mem_cache implements an in-memory based storage manager.
mod_mem_cache can be configured to operate in two modes: caching open file
descriptors or caching objects in heap storage. mod_mem_cache
is most useful when used to cache locally generated content or to cache
backend server content for mod_proxy configured for ProxyPass
(aka reverse proxy)
Content stored and retrived keyed to the URL. Content with
access protections is not cached.
Directives
| Description:
| The maximum number of objects allowed to be placed in the cache | | Syntax:
| MCacheMaxObjectCount value | | Default:
| MCacheMaxObjectCount 1009 | | Context:
| server config | | Status:
| Experimental | | Module:
| mod_mem_cache |
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The MCacheMaxObjectCount directive sets the maximum
number of objects to be cached. If a new entry needs to be
inserted in the cache and the maximum number of objects is reached, an entry
will be removed to allow the new entry be cached.
The size must be greater than MCacheMinObjectSize.
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The value of MCacheMaxObjectCount is used to create
the open hash table.
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MCacheMaxObjectCount 13001
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| Description:
| The maximum size (in bytes) of an object to be placed in the cache | | Syntax:
| MCacheMaxObjectSize bytes | | Default:
| MCacheMaxObjectSize 10000 | | Context:
| server config | | Status:
| Experimental | | Module:
| mod_mem_cache |
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The MCacheMaxObjectSize directive sets the maximum
size of an object to be cached.
MCacheMaxObjectSize 6400000
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| Description:
| The minimum size (in bytes) of an object to be placed in the cache | | Syntax:
| MCacheMinObjectSize bytes | | Default:
| MCacheMinObjectSize 0 | | Context:
| server config | | Status:
| Experimental | | Module:
| mod_mem_cache |
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The MCacheMinObjectSize directive sets the minimum
size in bytes of an object to be cached.
MCacheMinObjectSize 10000
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| Description:
| The algorithm used to remove entries from the cache | | Syntax:
| MCacheRemovalAlgorithm algorithm | | Default:
| MCacheRemovalAlgorithm GDSF | | Context:
| server config | | Status:
| Experimental | | Module:
| mod_mem_cache |
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The MCacheRemovalAlgorithm directive sets the algorithm
used to remove entries from the cache.
Two choices are available:
LRU (Least Recently Used): LRU removes the objects that have not been
accessed for the longest time.
GDSF (GreadyDual-Size): This algorithm assigns priority to cached objects
based on the coast of a cache miss and the size of the object. Objects with
smallest priority are removed first.
MCacheRemovalAlgorithm GDSF
MCacheRemovalAlgorithm LRU
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The MCacheSize directive sets the desired space
usage of the cache, in KBytes (1024-byte units). If a new entry needs to be
inserted in the cache and the size of the entry is greather than the
remaining size, entries will be removed until the new entry could be cached.
The removed entry is decided base on the MCacheRemovalAlgorithm algorithm
The size must be greater than MCacheMaxObjectSize.
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