Squid configuration directive cache_replacement_policy
Available in: v7 v6 v5 v4 3.5 3.4 3.3 3.2 2.7 3.1 3.0 2.6
For older versions than v4 see the linked pages above
Configuration Details:
Option Name: | cache_replacement_policy |
---|---|
Replaces: | |
Requires: | |
Default Value: | cache_replacement_policy lru |
Suggested Config: |
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The cache replacement policy parameter determines which objects are evicted (replaced) when disk space is needed. lru : Squid's original list based LRU policy heap GDSF : Greedy-Dual Size Frequency heap LFUDA: Least Frequently Used with Dynamic Aging heap LRU : LRU policy implemented using a heap Applies to any cache_dir lines listed below this directive. The LRU policies keeps recently referenced objects. The heap GDSF policy optimizes object hit rate by keeping smaller popular objects in cache so it has a better chance of getting a hit. It achieves a lower byte hit rate than LFUDA though since it evicts larger (possibly popular) objects. 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. Both policies utilize a dynamic aging mechanism that prevents cache pollution that can otherwise occur with frequency-based replacement policies. NOTE: if using the LFUDA replacement policy you should increase the value of maximum_object_size above its default of 4 MB to to maximize the potential byte hit rate improvement of LFUDA. For more information about the GDSF and LFUDA cache replacement policies see http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html and http://fog.hpl.external.hp.com/techreports/98/HPL-98-173.html. |
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