[GitHub] [doris] Gabriel39 commented on pull request #13286: [Improvement](join) refine prefetch strategy

Tue, 11 Oct 2022 01:35:14 -0700 


Gabriel39 commented on PR #13286:
URL: https://github.com/apache/doris/pull/13286#issuecomment-1274310804

   Impact on cache miss
   
   I observed impact of different prefetch steps on cache miss for TPCH Q14.
   
   Baseline
   
![image](https://user-images.githubusercontent.com/37700562/195040228-c4df386d-d32f-481d-aed1-7dd8d8767d9c.png)
   
   step = 32
   
   
![image](https://user-images.githubusercontent.com/37700562/195040294-5b96da60-a330-4a06-88b0-43d6ede2514b.png)
   
   step = 64
   
![image](https://user-images.githubusercontent.com/37700562/195040375-88067488-5cf5-4b93-ae1d-4ef1a2342c96.png)
   
   step = 128
   
![image](https://user-images.githubusercontent.com/37700562/195040442-272c072d-33ce-4bdc-8c90-7635c3186b1e.png)
   
   


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