MCacheMaxObjectCount Directive

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.

MCacheMaxObjectSize Directive

The MCacheMaxObjectSize directive sets the maximum allowable size, in bytes, of a document for it to be considered cacheable.

MCacheMaxStreamingBuffer Directive

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.

MCacheMinObjectSize Directive

The MCacheMinObjectSize directive sets the minimum size in bytes of a document for it to be considered cacheable.

MCacheRemovalAlgorithm Directive

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.

MCacheSize Directive

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.