1.8 - multi level storage

Catalog

One 、 Multi level storage related test sites

1、 Multilevel storage architecture ;

2、 Virtual storage ;

Two 、 Multilevel storage architecture

1、 External storage

2、 Main memory

3、 Cache

4、 register

3、 ... and 、 The reason why computers design multi-level storage

Four 、 Virtual storage

1、 The main role

2、 understand

5、 ... and 、 Test method 1： Reasons for tiered storage systems

6、 ... and 、 Test method 2： Virtual memory

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One 、 Multi level storage related test sites

1、 Multilevel storage architecture ;

2、 Virtual storage ;

Two 、 Multilevel storage architecture

1、 External storage

• For example, commonly used mobile hard disks belong to external memory ;

2、 Main memory

• It is often referred to as computer memory ;

3、 Cache

• for example CPU The cache inside is the cache ;

4、 register

• Is the fastest of the four storage , But the cost is high , Very small capacity ;

3、 ... and 、 The reason why computers design multi-level storage

• The computer adopts multi-level storage , Mainly based on Capacity 、 Speed 、 cost These three factors are considered . Multilevel storage structure From top to bottom , More and more capacity , Slower and slower , The cost is getting lower ; At the same time, this multi-level storage mode is beneficial to the computer CPU Give full play to its performance , It also solves the problem of data storage ;
• Because the cost of external storage is low , But it's slower ; Its operating frequency 、 Working frequency , Data transmission is slow ; Registers are very fast , But the cost is high , Small capacity ;

Four 、 Virtual storage

1、 The main role

• Used to expand the location space of main memory ;

2、 understand

• When the computer is running , Often run programs that have more memory than the computer ;
• The program needs to load data into memory to run ;
• At this time, through the virtual storage , On the external memory , That is, on the hard disk （ On disk ） Open up a storage space as virtual storage , This increases the location space of the main memory , This allows you to successfully run programs that are larger than memory ;

5、 ... and 、 Test method 1： Reasons for tiered storage systems

6、 ... and 、 Test method 2： Virtual memory