1. Compiler optimization used manual tuning technique in the past several decades.

2. Aimed at the problems of parameter manual tuning method of PID controller in DCS of power plant, puts forward the auto-tuning method based on the step identification.

3. It is pleasant that besides the wide selection of topical programs, to user are accessible all necessary manual tuning of the parameters of exposure.

4. Why should you ever find it necessary to intervene and do some manual tuning?

5. The experimental results show that, automatic compiler tuning can get better performance than the manual tuning in the training cases and in the new cases, they get close performance.