rmuir commented on PR #15312:
URL: https://github.com/apache/lucene/pull/15312#issuecomment-3383327305

   This one seems to shave a couple minutes off the workers:
   
   Main (windows): 297s
   ```
   Summary of top-20 task execution times (aggregated by unique name, possibly 
running in parallel):
    1687.82 sec.  test
    157.29 sec.  compileTestJava
    140.94 sec.  compileJava
   ```
   
   Patch (windows): 223s (-74s)
   ```
   Summary of top-20 task execution times (aggregated by unique name, possibly 
running in parallel):
    1827.28 sec.  test
    117.34 sec.  compileJava
    106.81 sec.  compileTestJava
      5.91 sec.  jar
   ```
   
   Main (ubuntu): 212s
   ```
   Summary of top-20 task execution times (aggregated by unique name, possibly 
running in parallel):
    1055.80 sec.  test
    120.90 sec.  compileTestJava
     91.67 sec.  compileJava
   ```
   
   Patch (ubuntu): 139s (-82s)
   ```
   Summary of top-20 task execution times (aggregated by unique name, possibly 
running in parallel):
    1154.43 sec.  test
     94.06 sec.  compileTestJava
     45.29 sec.  compileJava
   ```
   
   Main (mac): 132s
   ```
   Summary of top-20 task execution times (aggregated by unique name, possibly 
running in parallel):
    2808.08 sec.  test
     69.64 sec.  compileTestJava
     62.36 sec.  compileJava
   ```
   
   Patch (mac): 72s (-60s)
   ```
   Summary of top-20 task execution times (aggregated by unique name, possibly 
running in parallel):
    1131.64 sec.  test
     38.52 sec.  compileJava
     33.52 sec.  compileTestJava
   ```
   
   Numbers are very noisy and sample size is tiny. But I have previously seen 
builds spending 13 minutes in the compilation phase, which makes me want to 
reduce the overhead:
   ```
   Summary of top-20 task execution times (aggregated by unique name, possibly 
running in parallel):
    1344.83 sec.  test
    553.56 sec.  compileTestJava
    233.73 sec.  compileJava
   ```


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