Apache HTTP Server Version 2.1
Apache HTTP Server Version 2.1
| Description: | Content cache keyed to URIs |
|---|---|
| Status: | Experimental |
| Module Identifier: | mem_cache_module |
| Source File: | mod_mem_cache.c |
This module requires the service of mod_cache. It acts as a support module for mod_cache and provides a 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 is stored in and retrieved from the cache using URI based keys. Content with access protection is not cached.
| 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 |
The MCacheMaxObjectCount directive sets the
maximum number of objects to be cached. The value is used to create the
open hash table. If a new object needs to be inserted in the cache and
the maximum number of objects has been reached, an object will be
removed to allow the new object to be cached. The object to be removed
is selected using the algorithm specified by MCacheRemovalAlgorithm.
MCacheMaxObjectCount 13001
| Description: | The maximum size (in bytes) of a document allowed in the cache |
|---|---|
| Syntax: | MCacheMaxObjectSize bytes |
| Default: | MCacheMaxObjectSize 10000 |
| Context: | server config |
| Status: | Experimental |
| Module: | mod_mem_cache |
The MCacheMaxObjectSize directive sets the
maximum allowable size, in bytes, of a document for it to be considered
cacheable.
MCacheMaxObjectSize 6400000
The value of MCacheMaxObjectSize must be
greater than the value specified by the MCacheMinObjectSize directive.
| Description: | The minimum size (in bytes) of a document to be allowed in the cache |
|---|---|
| Syntax: | MCacheMinObjectSize bytes |
| Default: | MCacheMinObjectSize 0 |
| Context: | server config |
| Status: | Experimental |
| Module: | mod_mem_cache |
The MCacheMinObjectSize directive sets the
minimum size in bytes of a document for it to be considered
cacheable.
MCacheMinObjectSize 10000
| Description: | The algorithm used to select documents for removal from the cache |
|---|---|
| Syntax: | MCacheRemovalAlgorithm LRU|GDSF |
| Default: | MCacheRemovalAlgorithm GDSF |
| Context: | server config |
| Status: | Experimental |
| Module: | mod_mem_cache |
The MCacheRemovalAlgorithm directive specifies
the algorithm used to select documents for removal from the cache.
Two choices are available:
LRU (Least Recently Used)LRU removes the documents that have not been accessed
for the longest time.GDSF (GreadyDual-Size)GDSF assigns a priority to cached documents based
on the cost of a cache miss and the size of the document. Documents
with the lowest priority are removed first.
MCacheRemovalAlgorithm GDSF
MCacheRemovalAlgorithm LRU
| Description: | The maximum amount of memory used by the cache in KBytes |
|---|---|
| Syntax: | MCacheSize KBytes |
| Default: | MCacheSize 100 |
| Context: | server config |
| Status: | Experimental |
| Module: | mod_mem_cache |
The MCacheSize directive sets the maximum
amount of memory to be used by the cache, in KBytes (1024-byte units).
If a new object needs to be inserted in the cache and the size of the
object is greater than the remaining memory, objects will be removed
until the new object can be cached. The object to be removed is
selected using the algorithm specified by MCacheRemovalAlgorithm.
MCacheSize 700000
The MCacheSize value must be greater than
the value specified by the MCacheMaxObjectSize directive.