From e8ec7aa8e38a93f5b034ac74cebce5de23710317 Mon Sep 17 00:00:00 2001 From: hongbotian Date: Mon, 30 Nov 2015 01:45:08 -0500 Subject: upload http JIRA: BOTTLENECK-10 Change-Id: I7598427ff904df438ce77c2819ee48ac75ffa8da Signed-off-by: hongbotian --- .../docs/manual/mod/mod_mem_cache.html.en | 241 +++++++++++++++++++++ 1 file changed, 241 insertions(+) create mode 100644 rubbos/app/httpd-2.0.64/docs/manual/mod/mod_mem_cache.html.en (limited to 'rubbos/app/httpd-2.0.64/docs/manual/mod/mod_mem_cache.html.en') diff --git a/rubbos/app/httpd-2.0.64/docs/manual/mod/mod_mem_cache.html.en b/rubbos/app/httpd-2.0.64/docs/manual/mod/mod_mem_cache.html.en new file mode 100644 index 00000000..6cf684d6 --- /dev/null +++ b/rubbos/app/httpd-2.0.64/docs/manual/mod/mod_mem_cache.html.en @@ -0,0 +1,241 @@ + + + +mod_mem_cache - Apache HTTP Server + + + + + +
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Modules | Directives | FAQ | Glossary | Sitemap

+

Apache HTTP Server Version 2.0

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Apache Module mod_mem_cache

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Available Languages:  en  | + ja  | + ko 

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+ + + +
Description:Content cache keyed to URIs
Status:Experimental
Module Identifier:mem_cache_module
Source File:mod_mem_cache.c
+

Summary

+ +
+ This module is experimental. Documentation is still under + development... +
+ +

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.

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+

MCacheMaxObjectCount Directive

+ + + + + + + +
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.

+ +

Example

+ MCacheMaxObjectCount 13001 +

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+

MCacheMaxObjectSize Directive

+ + + + + + + +
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.

+ +

Example

+ MCacheMaxObjectSize 6400000 +

+ +

Note

+

The value of MCacheMaxObjectSize must be + greater than the value specified by the MCacheMinObjectSize directive.

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+

MCacheMaxStreamingBuffer Directive

+ + + + + + + +
Description:Maximum amount of a streamed response to buffer in memory +before declaring the response uncacheable
Syntax:MCacheMaxStreamingBuffer size_in_bytes
Default:MCacheMaxStreamingBuffer the smaller of 100000 or MCacheMaxObjectSize
Context:server config
Status:Experimental
Module:mod_mem_cache
+

The MCacheMaxStreamingBuffer directive + specifies the maximum number of bytes of a streamed response to + buffer before deciding that the response is too big to cache. + A streamed response is one in which the entire content is not + immediately available and in which the Content-Length + may not be known. Sources of streaming responses include proxied + responses and the output of CGI scripts. By default, a streamed + response will not be cached unless it has a + Content-Length header. The reason for this is to + avoid using a large amount of memory to buffer a partial response + that might end up being too large to fit in the cache. + The MCacheMaxStreamingBuffer directive allows + buffering of streamed responses that don't contain a + Content-Length up to the specified maximum amount of + space. If the maximum buffer space is reached, the buffered + content is discarded and the attempt to cache is abandoned.

+ +

Note:

+

Using a nonzero value for MCacheMaxStreamingBuffer + will not delay the transmission of the response to the client. + As soon as mod_mem_cache copies a block of streamed + content into a buffer, it sends the block on to the next output + filter for delivery to the client.

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+ +

+ # Enable caching of streamed responses up to 64KB:
+ MCacheMaxStreamingBuffer 65536 +

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+

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.

+ +

Example

+ MCacheMinObjectSize 10000 +

+ +
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+

MCacheRemovalAlgorithm Directive

+ + + + + + + +
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.
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+ +

Example

+ MCacheRemovalAlgorithm GDSF
+ MCacheRemovalAlgorithm LRU +

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+

MCacheSize Directive

+ + + + + + + +
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.

+ +

Example

+ MCacheSize 700000 +

+ +

Note

+

The MCacheSize value must be greater than + the value specified by the MCacheMaxObjectSize directive.

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Available Languages:  en  | + ja  | + ko 

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