thisisnic commented on PR #48974:
URL: https://github.com/apache/arrow/pull/48974#issuecomment-3807314987

   I compared with the log from run 305, and got the below.
   
   ___________________________________
   
   | Step                       | Old    | New    | Diff   |                    
                                                                             
     |----------------------------|--------|--------|--------|                  
                                                                               
     | build_arrow_cpp            | 6m     | 5m     | -0m    |                  
                                                                               
     | build_arrow_python         | 4m     | 4m     | -0m    |                  
                                                                               
     | cpp-micro                  | 70m    | 105m   | +35m   |                  
                                                                               
     | csv-read                   | 16m    | 36m    | +19m   |                  
                                                                               
     | dataframe-to-table (Py)    | 3m     | 4m     | +2m    |                  
                                                                               
     | dataset-filter             | 0m     | 1m     | +1m    |                  
                                                                               
     | dataset-read               | 2m     | 7m     | +4m    |                  
                                                                               
     | dataset-select             | 0m     | 0m     | +0m    |                  
                                                                               
     | dataset-selectivity        | 11m    | 11m    | +1m    |                  
                                                                               
     | dataset-serialize          | 34m    | 45m    | +11m   |                  
                                                                               
     | file-read (Py)             | 10m    | 12m    | +2m    |                  
                                                                               
     | file-write (Py)            | 15m    | 16m    | +1m    |                  
                                                                               
     | recursive-get-file-info    | 0m     | 5m     | +5m    |                  
                                                                               
     | wide-dataframe             | 0m     | 0m     | +0m    |                  
                                                                               
     | build_arrow_r              | 45m    | 45m    | +0m    |                  
                                                                               
     | dataframe-to-table (R)     | 4m     | 5m     | +2m    |                  
                                                                               
     | file-read (R)              | 6m     | 12m    | +6m    |                  
                                                                               
     | file-write (R)             | 26m    | 36m    | +10m   |                  
                                                                               
     | partitioned-dataset-filter | 7m     | 11m    | +4m    |                  
                                                                               
     | tpch                       | 135m   | 48m*   | -87m   |                  
                                                                               
     | **TOTAL**                  | **394m** | **420m** | **+26m** |            
                                                                               
                                                                                
                                                                               
     *killed before completion                                                  
                                                                               
                                                                                
                    
   Old job: 394m (~6.5h), completed                                             
                                                                             
   New job: 420m (7h), timed out                                                
                                                                             
   
   Almost everything got slower. The cumulative slowdown (~1h extra before tpch 
starts) means tpch doesn't have enough time to finish within the timeout.


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