computer performances

computer performances

1. Clock speed

   • The clock speed is measured in GHz
     • A hertz is cycles per second
   • Clock speed is the rate at which a processor can complete a processing cycle. It is typically measured in megahertz or gigahertz. One megahertz is equal to one million cycles per second, while one gigahertz equals one billion cycles per second.
     • how
       • A faster CPU uses more energy and creates more heat. A computer will normally have a maximum clock speed set by default, but it is possible to change this speed in the computer BIOS . Some people increase a CPU clock speed to try to make their computer run faster - this is called overclocking.

2. cache

   • A cache -- pronounced CASH -- is hardware or software that is used to store something, usually data, temporarily in a computing environment. ... Cache is frequently used by cache clients, such as the CPU, applications, web browsers or operating systems (OSes).
   • it is used to acsess data from the main memory.
   • how
     • The more cache there is, the more data can be stored closer to the CPU. Cache memory is beneficial because: Cache memory holds frequently used instructions/data which the processor may require next and it is faster access memory than RAM, since it is on the same chip as the processor.

3. operate system

   • Aplications
     • file
     • OAP

4. computures

5. portability

   • Portability is a characteristic attributed to a computer program if it can be used in an operating systems other than the one in which it was created without requiring major rework. Porting is the task of doing any work necessary to make the computer program run in the new environment.
   • They have a lower specification than most desktop systems.
   • They are less ergonomic and are less suited for full-time usage in most of the cases.
   • Expansion is tough and any repair could prove costly.
   • Most of portable computers are not upgradeable.

6. durability

   • In database systems, durability is the ACID property which guarantees that transactions that have committed will survive permanently. ... Many DBMSs implement durability by writing transactions into a transaction log that can be reprocessed to recreate the system state right before any later failure.