Baunsgaard commented on PR #1709:
URL: https://github.com/apache/systemds/pull/1709#issuecomment-1288152387

   Specialized Append, and multi threading the append:
   
   
![image](https://user-images.githubusercontent.com/9947148/197404710-7de13f31-64f5-4109-a8d6-0b1a6136e304.png)
   
   Unfortunately the parallelization have increased the base time, of the 
previous already good execution time, so further tuning is needed to make 
decisions for parallelization.
   
   To break down the execution time better, i have chosen to change to only 
plot IO time, instead of end-to-end time:
   
   
![image](https://user-images.githubusercontent.com/9947148/197404668-7374515d-343f-4d14-baf6-180c94bbc20d.png)
   


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