Table of contents
overview
Performance
Reference: [soft test - system architecture designer] knowledge points - 8 - know almost
Response time:
- 0.1 second: the user does not feel any delay;
- 1.0 seconds: The time limit that the user is willing to accept the immediate response of the system; that is, when the effective feedback time for executing a task is within 0.1 to 1 second, the user is willing to accept; exceeding this data value means that the user will feel There is a delay, but as long as it does not exceed 10 seconds, the user is still acceptable;
- 10 seconds: The limit for the user to keep his attention to perform this task. If no effective feedback is obtained beyond this value, the customer will turn to other tasks while waiting for the computer to complete the current operation.
performance tuning
Amdar
Amdahl's law quantitatively defines the degree to which the overall performance of the system can be improved by improving the performance of a certain component in the system.
ps:
Example: Assuming that the processing time of a certain function is 60% of the running time of the entire system, if the processing speed of this function is increased to 5 times of the original, then according to Amdahl's law, the processing speed of the entire system can be increased to the original ( ) times.
A. 1.333 B. 1.923 C. 1.5 D. 1.829
performance evaluation
