[GitHub] [spark] zhengruifeng commented on pull request #30468: [SPARK-33518][ML][WIP] Improve performance of ML ALS recommendForAll by GEMV

Mon, 23 Nov 2020 03:18:02 -0800 


zhengruifeng commented on pull request #30468:
URL: https://github.com/apache/spark/pull/30468#issuecomment-732096836


   Finally, I found that `Guava.Ordering` seems much more efficient than 
`BoundedPriorityQueue`. (see [Selecting top k items from a list efficiently in 
Java / 
Groovy](https://www.michaelpollmeier.com/selecting-top-k-items-from-a-list-efficiently-in-java-groovy))
   
   
![als_gemv_array_jobs_2020_11_23_16_44_39](https://user-images.githubusercontent.com/7322292/99956156-81d32000-2dc0-11eb-9684-43685ef3a7b0.png)
   
   
![als_gemv_array_exe_2020_11_23_16_44_15](https://user-images.githubusercontent.com/7322292/99956172-8a2b5b00-2dc0-11eb-8d13-21a81d8b3f4d.png)
   


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