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add random two and remove myclock (it has renamed to sieve now)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,204 @@ | ||
| // | ||
| // RandomTwo.c | ||
| // libCacheSim | ||
| // | ||
| // Picks two objects at random and evicts the one that is the least recently | ||
| // used RandomTwo eviction | ||
| // | ||
| // Created by Juncheng on 8/2/16. | ||
| // Copyright © 2016 Juncheng. All rights reserved. | ||
| // | ||
|
|
||
| #include "../../dataStructure/hashtable/hashtable.h" | ||
| #include "../../include/libCacheSim/evictionAlgo.h" | ||
| #include "../../include/libCacheSim/macro.h" | ||
|
|
||
| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
|
|
||
| // *********************************************************************** | ||
| // **** **** | ||
| // **** function declarations **** | ||
| // **** **** | ||
| // *********************************************************************** | ||
|
|
||
| static void RandomTwo_free(cache_t *cache); | ||
| static bool RandomTwo_get(cache_t *cache, const request_t *req); | ||
| static cache_obj_t *RandomTwo_find(cache_t *cache, const request_t *req, | ||
| const bool update_cache); | ||
| static cache_obj_t *RandomTwo_insert(cache_t *cache, const request_t *req); | ||
| static cache_obj_t *RandomTwo_to_evict(cache_t *cache, const request_t *req); | ||
| static void RandomTwo_evict(cache_t *cache, const request_t *req); | ||
| static bool RandomTwo_remove(cache_t *cache, const obj_id_t obj_id); | ||
|
|
||
| // *********************************************************************** | ||
| // **** **** | ||
| // **** end user facing functions **** | ||
| // **** **** | ||
| // **** init, free, get **** | ||
| // *********************************************************************** | ||
| /** | ||
| * @brief initialize a RandomTwo cache | ||
| * | ||
| * @param ccache_params some common cache parameters | ||
| * @param cache_specific_params RandomTwo specific parameters, should be NULL | ||
| */ | ||
| cache_t *RandomTwo_init(const common_cache_params_t ccache_params, | ||
| const char *cache_specific_params) { | ||
| common_cache_params_t ccache_params_copy = ccache_params; | ||
| ccache_params_copy.hashpower = MAX(12, ccache_params_copy.hashpower - 8); | ||
|
|
||
| cache_t *cache = | ||
| cache_struct_init("RandomTwo", ccache_params, cache_specific_params); | ||
| cache->cache_init = RandomTwo_init; | ||
| cache->cache_free = RandomTwo_free; | ||
| cache->get = RandomTwo_get; | ||
| cache->find = RandomTwo_find; | ||
| cache->insert = RandomTwo_insert; | ||
| cache->to_evict = RandomTwo_to_evict; | ||
| cache->evict = RandomTwo_evict; | ||
| cache->remove = RandomTwo_remove; | ||
|
|
||
| return cache; | ||
| } | ||
|
|
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| /** | ||
| * free resources used by this cache | ||
| * | ||
| * @param cache | ||
| */ | ||
| static void RandomTwo_free(cache_t *cache) { cache_struct_free(cache); } | ||
|
|
||
| /** | ||
| * @brief this function is the user facing API | ||
| * it performs the following logic | ||
| * | ||
| * ``` | ||
| * if obj in cache: | ||
| * update_metadata | ||
| * return true | ||
| * else: | ||
| * if cache does not have enough space: | ||
| * evict until it has space to insert | ||
| * insert the object | ||
| * return false | ||
| * ``` | ||
| * | ||
| * @param cache | ||
| * @param req | ||
| * @return true if cache hit, false if cache miss | ||
| */ | ||
| static bool RandomTwo_get(cache_t *cache, const request_t *req) { | ||
| return cache_get_base(cache, req); | ||
| } | ||
|
|
||
| // *********************************************************************** | ||
| // **** **** | ||
| // **** developer facing APIs (used by cache developer) **** | ||
| // **** **** | ||
| // *********************************************************************** | ||
|
|
||
| /** | ||
| * @brief check whether an object is in the cache | ||
| * | ||
| * @param cache | ||
| * @param req | ||
| * @param update_cache whether to update the cache, | ||
| * if true, the object is promoted | ||
| * and if the object is expired, it is removed from the cache | ||
| * @return true on hit, false on miss | ||
| */ | ||
| static cache_obj_t *RandomTwo_find(cache_t *cache, const request_t *req, | ||
| const bool update_cache) { | ||
| cache_obj_t *obj = cache_find_base(cache, req, update_cache); | ||
| if (obj != NULL && update_cache) { | ||
| obj->RandomTwo.last_access_vtime = cache->n_req; | ||
| } | ||
|
|
||
| return obj; | ||
| } | ||
|
|
||
| /** | ||
| * @brief insert an object into the cache, | ||
| * update the hash table and cache metadata | ||
| * this function assumes the cache has enough space | ||
| * and eviction is not part of this function | ||
| * | ||
| * @param cache | ||
| * @param req | ||
| * @return the inserted object | ||
| */ | ||
| static cache_obj_t *RandomTwo_insert(cache_t *cache, const request_t *req) { | ||
| cache_obj_t *obj = cache_insert_base(cache, req); | ||
| obj->RandomTwo.last_access_vtime = cache->n_req; | ||
|
|
||
| return obj; | ||
| } | ||
|
|
||
| /** | ||
| * @brief find the object to be evicted | ||
| * this function does not actually evict the object or update metadata | ||
| * not all eviction algorithms support this function | ||
| * because the eviction logic cannot be decoupled from finding eviction | ||
| * candidate, so use assert(false) if you cannot support this function | ||
| * | ||
| * @param cache the cache | ||
| * @return the object to be evicted | ||
| */ | ||
| static cache_obj_t *RandomTwo_to_evict(cache_t *cache, const request_t *req) { | ||
| cache_obj_t *obj_to_evict1 = hashtable_rand_obj(cache->hashtable); | ||
| cache_obj_t *obj_to_evict2 = hashtable_rand_obj(cache->hashtable); | ||
| DEBUG_ASSERT(obj_to_evict->obj_size != 0); | ||
| if (obj_to_evict1->RandomTwo.last_access_vtime < | ||
| obj_to_evict2->RandomTwo.last_access_vtime) | ||
| return obj_to_evict1; | ||
| else | ||
| return obj_to_evict2; | ||
| } | ||
|
|
||
| /** | ||
| * @brief evict an object from the cache | ||
| * it needs to call cache_evict_base before returning | ||
| * which updates some metadata such as n_obj, occupied size, and hash table | ||
| * | ||
| * @param cache | ||
| * @param req not used | ||
| */ | ||
| static void RandomTwo_evict(cache_t *cache, const request_t *req) { | ||
| cache_obj_t *obj_to_evict1 = hashtable_rand_obj(cache->hashtable); | ||
| cache_obj_t *obj_to_evict2 = hashtable_rand_obj(cache->hashtable); | ||
| DEBUG_ASSERT(obj_to_evict->obj_size != 0); | ||
| if (obj_to_evict1->RandomTwo.last_access_vtime < | ||
| obj_to_evict2->RandomTwo.last_access_vtime) | ||
| cache_evict_base(cache, obj_to_evict1, true); | ||
| else | ||
| cache_evict_base(cache, obj_to_evict2, true); | ||
| } | ||
|
|
||
| /** | ||
| * @brief remove an object from the cache | ||
| * this is different from cache_evict because it is used to for user trigger | ||
| * remove, and eviction is used by the cache to make space for new objects | ||
| * | ||
| * it needs to call cache_remove_obj_base before returning | ||
| * which updates some metadata such as n_obj, occupied size, and hash table | ||
| * | ||
| * @param cache | ||
| * @param obj_id | ||
| * @return true if the object is removed, false if the object is not in the | ||
| * cache | ||
| */ | ||
| static bool RandomTwo_remove(cache_t *cache, const obj_id_t obj_id) { | ||
| cache_obj_t *obj = hashtable_find_obj_id(cache->hashtable, obj_id); | ||
| if (obj == NULL) { | ||
| return false; | ||
| } | ||
| cache_remove_obj_base(cache, obj, true); | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| #ifdef __cplusplus | ||
| } | ||
| #endif |
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