根据是write-back还是write-through来具体操作: write-back:将数据更新到cache,并不更新到内存(DRAM),待后续flush cache时存入内存; write-through:数据同时会更新到cache和内存; 如果没有(write miss): 根据是write-allocate或是write-no-allocate: write-allocate:将要写入的位置从内存读到cache,然后按照上述write ...
透写(Write Through)通常与无写分配(No Write Allocate)一起使用。因为它们仍然需要直接写入后备内存,所以在这里后续写入没有优势。 1.4. 缓存数据写入的一致性 缓存以外的实体可能会更改后备内存中的数据。在这种情况下,缓存中的副本可能会过期或过时。或者,当客户端更新缓存中的数据时,其他缓存中的这些数据的副本将...
读直达Read through:在发生读操作缺失的情况时,直接从主存中读取数据; 读分配Read allocate:先把数据从主存中读取出来,再将该数据写入cache中进行缓存。 3.2 cache写 写分配Write allocate:在发生写操作缺失的情况时,先会从主存中读取数据到cache中(相当于先进行读分配),然后会将要写入的数据写入cache 中。这种写分...
一、CPU读Cache 1. Read through,即直接从内存中读取数据; 2. Read allocate,先把数据读取到Cache中,再从Cache中读数据。 二、CPU写Cache 1. 若hit命中,有两种处理方式: Write-through:write is done synchronously both to the cache and to the backing store。Write-through(直写模式)在数据更新时,把数据...
No-write allocate方式并不将写入位置读入缓存,而是直接将数据写入存储。这种方式下,只有读操作会被缓存。 无论是Write-through还是Write-back都可以使用写缺失的两种方式之一。只是通常Write-back采用Write allocate方式,而Write-through采用No-write allocate方式;因为多次写入同一缓存时,Write allocate配合Write-back可以提...
No-write allocate方式并不将写入位置读入缓存，而是直接将数据写入存储。这种方式下，只有读操作会被缓存。无论是Write-through还是Write-back都可以使用写缺失的两种方式之一。只是通常Write-back采用Write allocate方式，而Write-through采用No-write allocate方式;因为多次写入同一缓存时，Write allocate配合...
无论是Write-through 还是Write-back都可以使用写缺失的两种方式之一。只是通常Write-back采用Writeallocate方式,而 Write-through 采用No-write allocate方式;因为多次写入同一缓存时,Write allocate配合Write-back可以提升性能;而对于 Write-through 则没有帮助。处理流程图Write-through模式处理流程:2 脚本之寂A Write-...
The method further includes after completion of the cache clean operation, changing a size of the cache memory and changing the mode of operation of the cache to a mode other than the write through/no allocate mode.Pyla, ManojkumarCodrescu, Lucian...
A write-through cache uses no-write allocate. Here, subsequent writes have no advantage, since they still need to be written directly to the bacing store. Entities other than the cache may change the data in the backing store, in which case the copy in the cache may become out-of-date...
write-allocate no-fetch cache using a write-back write buffer is shown to have a better performance than both write-through and write-back caches. This... YC Chen,AV Veidenbaum - Supercomputing 被引量: 24发表: 1992年 - ASSOCIATIVE AND ATOMIC WRITE-BACK CACHING SYSTEM AND METHOD FOR STORAGE...