Sniper中cache实现

最新推荐文章于 2024-03-23 09:31:10 发布

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最新推荐文章于 2024-03-23 09:31:10 发布 · 1.2k 阅读

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#sniper #cache

本文详细介绍了Sniper模拟器中Cache的相关文件及其功能。从gainestown.cfg和nehalem.cfg配置文件到内存子系统的实现，包括CacheCntlr、Cache、CacheBase、CacheSet、CacheBlockInfo和LRU替换算法的详细解析。文章通过实例展示了不同组件之间的关系，如32KB、8-way set-associative、64B blocks的Cache结构。

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Sniper中cache相关的文件

config文件夹
- gainestown.cfg包含L3 cache的配置情况。嵌套包含了nehalem.cfg文件
- nehalem.cfg包含L2 cache和L1 cache的配置情况。
- sniper默认参数为gainestown.cfg文件

    ############  nehalem.cfg
    [perf_model/l1_icache]
    perfect = false
    cache_size = 32
    associativity = 4
    address_hash = mask
    replacement_policy = lru
    data_access_time = 4
    tags_access_time = 1
    perf_model_type = parallel
    writethrough = 0
    shared_cores = 1

    [perf_model/l1_dcache]
    perfect = false
    cache_size = 32
    associativity = 8
    address_hash = mask
    replacement_policy = lru
    data_access_time = 4
    tags_access_time = 1
    perf_model_type = parallel
    writethrough = 0
    shared_cores = 1

    [perf_model/l2_cache]
    perfect = false
    cache_size = 256
    associativity = 8
    address_hash = mask
    replacement_policy = lru
    data_access_time = 8 
    # 8.something according to membench, -1 cycle L1 tag access time
    tags_access_time = 3
    # Total neighbor L1/L2 access time is around 40/70 cycles (60-70 when it's coming out of L1)
    writeback_time = 50 # L3 hit time will be added
    perf_model_type = parallel
    writethrough = 0
    shared_cores = 1
    [perf_model/l2_cache/srrip]
    bits[] = 3,3,3,3,3 
    #srrip算法需要额外增加这些信息，指明每个cacheline的额外需要的位数


    ############  gainestown.cfg
    [perf_model/l3_cache]
    perfect = false
    cache_block_size = 64
    cache_size = 8192
    associativity = 16
    address_hash = mask
    replacement_policy =lru 
    data_access_time = 30 
    # 35 cycles total according to membench, +L1+L2 tag times
    tags_access_time = 10
    perf_model_type = parallel
    wri