Revision Tool

Revision Tool

1. PURPOSES OF CACHE

   • It's a temporary storage device that's used by websites and apps to store some data.
   • Stores data so that future requests for data can be run faster.
   • Contains references (thumbnails, settings etc...)

2. VIRTUAL MEMORY

   • Selection of volatile memory that's created temporarily on the storage drive. Created when lots of processes are running at once and RAM is running slowly.
     • VOLATILE MEMORY = memory used to store program data while it's being executed.
   • Much slower than the main memory because processing power is being taken up by data moving around ,rather than just executing instructions.

3. RAM

   • RAM = Random Access Memory
   • Volatile memory that's used to store important instructions such as the load operating system which are operating systems that are copied from disk to Ram.

4. CPU

   • CPU = Central Processing Unit
   • The brain of the computer that controls the computer
   • CPU CORES
     • A dual core processor (a CPU with 2 cores) can fetch and execute 2 instructions in the same amount of time that it takes a single core processor to fetch and execute 1 instruction
     • Cores can only do 1 thing at a time but they do it so quickly that it seems instantaneous.

5. CLOCK SPEED

   • Hertz (Hz) are used to measure a computer's clock speed.
   • One hertz is equivalent to one tick per second.
   • Clock speed is the speed at which a microprocessor processes instructions.