Title : Principles of Cache Memory
link : Principles of Cache Memory
Principles of Cache Memory
It is also known as Locality of Reference .
Analysis of a large number of typical programs has shown that data and instructions which has been used recently or which are located near to each other are more often used.
NOTE :---
The Phenomenon in which the references to memory at any given interval of time tend to be confined within a few localised areas in memory is known as the property of locality of reference.
There are two type locality reference:
1. Temporal Locality Reference :----
Temporal locality states that recently accessed data and instructions are likely to be accessed in the near future. For example, look at the case of loop, when a program loop is executed, the same set of instructions are referenced and fetched repeatedly.
2. Spatial Locality Reference:---
Spatial locality reference sates that data and instructions which are close to each other are likely to be accessed in near future. For example, in a program the instructions are stored in consecutive memory locations. Also, when in a program arrays are uses, the values are stored in consecutive locations.
Hence, it can be said that a processor spend 90% of its time in 10% of memory. Now if we can place this 10% of memory in cache memory , the memory access time would be greatly reduced.
Analysis of a large number of typical programs has shown that data and instructions which has been used recently or which are located near to each other are more often used.
NOTE :---
The Phenomenon in which the references to memory at any given interval of time tend to be confined within a few localised areas in memory is known as the property of locality of reference.
There are two type locality reference:
1. Temporal Locality Reference :----
Temporal locality states that recently accessed data and instructions are likely to be accessed in the near future. For example, look at the case of loop, when a program loop is executed, the same set of instructions are referenced and fetched repeatedly.
2. Spatial Locality Reference:---
Spatial locality reference sates that data and instructions which are close to each other are likely to be accessed in near future. For example, in a program the instructions are stored in consecutive memory locations. Also, when in a program arrays are uses, the values are stored in consecutive locations.
Hence, it can be said that a processor spend 90% of its time in 10% of memory. Now if we can place this 10% of memory in cache memory , the memory access time would be greatly reduced.
thus Article Principles of Cache Memory
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