Squid configuration directive cache_mem

Available in: 4   3.5   3.4   3.3   3.2   2.7   3.1   3.0   2.6  

For older versions than 3.3 see the linked pages above

Configuration Details:

Option Name:cache_mem
Replaces:
Requires:
Default Value:cache_mem 256 MB
Suggested Config:

	NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS SIZE.
	IT ONLY PLACES A LIMIT ON HOW MUCH ADDITIONAL MEMORY SQUID WILL
	USE AS A MEMORY CACHE OF OBJECTS. SQUID USES MEMORY FOR OTHER
	THINGS AS WELL. SEE THE SQUID FAQ SECTION 8 FOR DETAILS.

	'cache_mem' specifies the ideal amount of memory to be used
	for:
		* In-Transit objects
		* Hot Objects
		* Negative-Cached objects

	Data for these objects are stored in 4 KB blocks.  This
	parameter specifies the ideal upper limit on the total size of
	4 KB blocks allocated.  In-Transit objects take the highest
	priority.

	In-transit objects have priority over the others.  When
	additional space is needed for incoming data, negative-cached
	and hot objects will be released.  In other words, the
	negative-cached and hot objects will fill up any unused space
	not needed for in-transit objects.

	If circumstances require, this limit will be exceeded.
	Specifically, if your incoming request rate requires more than
	'cache_mem' of memory to hold in-transit objects, Squid will
	exceed this limit to satisfy the new requests.  When the load
	decreases, blocks will be freed until the high-water mark is
	reached.  Thereafter, blocks will be used to store hot
	objects.

	If shared memory caching is enabled, Squid does not use the shared
	cache space for in-transit objects, but they still consume as much
	local memory as they need. For more details about the shared memory
	cache, see memory_cache_shared.

 

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