Proxy server: Cache management

. All rights reserved. */ /* ========================================================================== */ /* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* ========================================================================== */ ]]> Describe your package here Describe your package requirements here Currently there are no FAQ items provided. squidcache none Proxy server: Cache management squid.inc General /pkg_edit.php?xml=squid.xml&id=0 Upstream Proxy /pkg_edit.php?xml=squid_upstream.xml&id=0 Cache Mgmt /pkg_edit.php?xml=squid_cache.xml&id=0 Access Control /pkg_edit.php?xml=squid_nac.xml&id=0 Traffic Mgmt /pkg_edit.php?xml=squid_traffic.xml&id=0 Auth Settings /pkg_edit.php?xml=squid_auth.xml&id=0 Local Users /pkg.php?xml=squid_users.xml Hard disk cache size harddisk_cache_size This is the amount of disk space (in megabytes) to use for cached objects. input 100 Hard disk cache system harddisk_cache_system This specifies the kind of storage system to use. ufs is the old well-known Squid storage format that has always been there. aufs uses POSIX-threads to avoid blocking the main Squid process on disk-I/O. (Formerly known as async-io.) diskd uses a separate process to avoid blocking the main Squid process on disk-I/O. null Does not use any storage. Ideal for Embedded/NanoBSD. select aufs Hard disk cache location harddisk_cache_location This is the directory where the cache will be stored. (note: do not end with a /). If you change this location, squid needs to make a new cache, this could take a while input 60 /var/squid/cache Memory cache size memory_cache_size This is the amount of physical RAM (in megabytes) to be used for negative cache and in-transit objects. This value should not exceed more than 50% of the installed RAM. The minimum value is 1MB. input 8 Minimum object size minimum_object_size Objects smaller than the size specified (in kilobytes) will not be saved on disk. The default value is 0, meaning there is no minimum. input 0 Maximum object size maximum_object_size Objects larger than the size specified (in kilobytes) will not be saved on disk. If you wish to increase speed more than you want to save bandwidth, this should be set to a low value. input 4 Level 1 subdirectories level1_subdirs Each level-1 directory contains 256 subdirectories, so a value of 256 level-1 directories will use a total of 65536 directories for the hard disk cache. This will significantly slow down the startup process of the proxy service, but can speed up the caching under certain conditions. select 16 Memory replacement policy memory_replacement_policy The memory replacement policy determines which objects are purged from memory when space is needed. The default policy for memory replacement is GDSF. LRU: Last Recently Used Policy - The LRU policies keep recently referenced objects. i.e., it replaces the object that has not been accessed for the longest time. Heap GDSF: Greedy-Dual Size Frequency - The Heap GDSF policy optimizes object-hit rate by keeping smaller, popular objects in cache. It achieves a lower byte hit rate than LFUDA though, since it evicts larger (possibly popular) objects. Heap LFUDA: Least Frequently Used with Dynamic Aging - The Heap LFUDA policy keeps popular objects in cache regardless of their size and thus optimizes byte hit rate at the expense of hit rate since one large, popular object will prevent many smaller, slightly less popular objects from being cached. Heap LRU: Last Recently Used - Works like LRU, but uses a heap instead. Note: If using the LFUDA replacement policy, the value of Maximum Object Size should be increased above its default of 12KB to maximize the potential byte hit rate improvement of LFUDA. select heap GDSF Cache replacement policy cache_replacement_policy The cache replacement policy decides which objects will remain in cache and which objects are replaced to create space for the new objects. The default policy for cache replacement is LFUDA. Please see the type descriptions specified in the memory replacement policy for additional detail. select heap LFUDA Low-water-mark in % cache_swap_low Cache replacement begins when the swap usage is above the low-low-water mark and attempts to maintain utilisation near the low-water-mark. input 90 High-water-mark in % cache_swap_high As swap utilisation gets close to the high-water-mark object eviction becomes more aggressive. input 95 Do not cache donotcache Enter each domain or IP address on a new line that should never be cached. textarea 50 5 base64 Enable offline mode enable_offline Enable this option and the proxy server will never try to validate cached objects. The offline mode gives access to more cached information than the proposed feature would allow (stale cached versions, where the origin server should have been contacted). checkbox if($_POST['harddisk_cache_size'] != $config['installedpackages']['squidcache']['config'][0]['harddisk_cache_size']) { $needs_dash_z = true; } squid_validate_cache($_POST, &$input_errors); squid_resync(); if($needs_dash_z) squid_dash_z();