Cache BY THANH NGUYEN What is cache Cache

Cache BY: THANH NGUYEN

What is cache? Cache is a high speed storage mechanism that speed up your data processing speed.

Cache - example A librarian without cache

Cache - example A librarian with some cache 5

Cache - example Even more cache. . 5

Terms Hit/ miss L 1 L 2

Idea Overall, the idea of cache technology is the use of a faster but smaller memory type to accelerate a slower but larger memory type

Normal caching system L 1 cache – Memory accesses at full microprocessor speed L 2 cache – Memory access of type SRAM (around 60 seconds, 32 megabytes to 128 megabytes in size) Hard disk – Mechanical, slow (around 20 to 30 nanoseconds, 128 kilobytes to 512 kilobytes in size) Main memory – Memory access of type RAM (10 nanoseconds, 4 kilobytes to 16 kilobytes in size) (around 12 milliseconds, 1 gigabyte to 10 gigabytes in size) Internet – Incredibly slow (between 1 second and 3 days, unlimited size)

Common question “If L 1 is so fast, why not make all of the computer’s memory run at the same speed as L 1 cache, so no caching would be required? ”

Answer Yes, we could but the general idea is: Build something small but fast Build something large but slow Build something large but fast

Cache in everything. . Types of cache Browser cache Memory cache Disk cache Processor cache

Source http: //goo. gl/Jo. Of 14 Librarian image http: //goo. gl/NKjcg 3 Shopping cart image http: //goo. gl/h. IEUUY Backpack image http: //computer. howstuffworks. com/cache. htm http: //www. techterms. com/definition/cache