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In computing, the MSI protocol - a basic cache-coherence protocol - operates in multiprocessor systems. As with other cache coherency protocols, the letters of the protocol name identify the possible states in which a cache line can be.
The MOSI protocol is an extension of the basic MSI cache coherency protocol. It adds the O wned state, which indicates that the current processor owns this block, and will service requests from other processors for the block.
– The cache that is responsible to supply the request data instead of a MM (Intervention) – Depending on the protocol, cache who must make the intervention can be S-E-M in MESI Illinois, or R/F-E-M in R-MESI type / MESIF or M (D) or O (SD) or also E (R) (*) in MOESI-type protocols, (e.g. AMD64, [16] Bull HN ISI [20] – see "Read Miss ...
This cache does not have permission to modify the copy. Unlike the MESI protocol, a shared cache line may be dirty with respect to memory; if it is, one cache has a copy in the Owned state, and that cache is responsible for eventually updating main memory. If no cache holds the line in the Owned state, the memory copy is up to date.
Bus snooping or bus sniffing is a scheme by which a coherency controller (snooper) in a cache (a snoopy cache) monitors or snoops the bus transactions, and its goal is to maintain a cache coherency in distributed shared memory systems. This scheme was introduced by Ravishankar and Goodman in 1983, under the name "write-once" cache coherency. [1]
A browser's cache stores temporary website files which allows the site to load faster in future sessions. This data will be recreated every time you visit the webpage, though at times it can become corrupted. Clearing the cache deletes these files and fixes problems like outdated pages, websites freezing, and pages not loading or being ...
The MESI protocol is an invalidate-based cache coherence protocol, and is one of the most common protocols that support write-back caches. It is also known as the Illinois protocol due to its development at the University of Illinois at Urbana-Champaign. [1] Write back caches can save considerable bandwidth generally wasted on a write through ...
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