No squid.conf.default, encontrei as referencias sobre policitas de cache: # TAG: cache_replacement_policy # 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. # # 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 4096 KB 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. #
Gostaria de pedir aos colegas que tentassem explicar (pode ser de forma rezumida) quais as diferenças (na prática) sobre cada uma dessas politicas de cache. Obrigado pela atenção. Uma ótima semana. --- Leonardo
