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# System prepended metadata

title: Computer Architecture

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# Computer Architecture



![](https://i.imgur.com/Uq2ymhw.png)

### Computer Performance
1. Response Time: When can i get the output(clock)
2. Through Put: What many things can a computer do in a time(clock)
3. CPI: clock-cycle per instruction
4. Clock-cycles: instruction-count * cycles per instruciton
5. CPU Time: (Instruction-count*CPI)/Clock-rate
### Organization

Performance Dependency
X means Depends
|          | Instruction<br>count | CPI  | Clock<br>Rate |
| -------- | ----------------- | ---- | ---------- |
| Program  |            X       |  X    |            |
|  Instruction-Set        |     X              |  X    |            |
|    Organization      |                   |   X   | X           |
|     Technology     |                   |      |          X  |
| Compiler | X             | X |       |

### Power
1. Dynamic Power
2. Static Power
#### Multi-Things
1. Multi-core: better throughput
2. Multi-programming: better response time

### Instructions ~ (C=A+B)
1. Stack
    * Push A
    * Push B
    * Add 
    * Pop C
2. Accumulator
    * Load A
    * Add B 
    * Store C
3. Register(register-memory)
    * Load R1 A
    * Add R1 B
    * Store C R1
4. Register(Load-Store)
    * Load R1 A
    * Load R2 B
    * Add R3 R1 R2
    * Store C R3
### General Purpose Register 
##### ADV
1. hold variables
2. memory traffic reduce-speed up
3. Code Density Improved-Registers have shorter name
### Key Usage
1. hold variables
2. parameter passing
3. expression evaluation
4. 