backing store

Writes are done to the backing store all the time.

That image has to get into the backing store somehow.

However, the entry must be written to the backing store at some point in time.

The client is not the application that changes data in the backing store.

Something actually has to draw the contents of each window into the backing store.

When a dirty bit is used, at all times some pages will exist in both physical memory and the backing store.

Backing stores are slow or expensive to access, compared to the cache.

The datum needs to be fetched from the backing store.

The cache can evict the data without writing it to the backing store.

Here, subsequent writes have no advantage, since they still need to be written directly to the backing store.

Caches usually use what is called a backing store.

These memory buffers are also called "backing stores," and they exist for every window on the system.

The other option is to only write to cache, and write to the backing store later.

Therefore, clients cannot assume that backing store is maintained.

The frame buffer is essentially the backing store for the single "image" that makes up the entire screen.

The backing store in RAM is no longer needed at all.

These coherency states are maintained through communication between the caches and the backing store.

Each window was treated like a 2D surface, with the backing store as its texture map.

A disk cache uses a hard disk as a backing store, for example.

Before the entries are deleted from the cache, they are written to the backing store.

Write-through - Write is done synchronously both to the cache and to the backing store.

If the data changed in the backing store, the copy in the cache will be out of date, or stale.

This strategy requires that the backing store retain a copy of the page after it is paged in to memory.

This was complemented by an additional 8192 words of backing store on magnetic drum (3000 rpm).

Usually, it is copied into the cache, so that the next time, it no longer needs to be fetched from the backing store.