rmuir commented on issue #14315:
URL: https://github.com/apache/lucene/issues/14315#issuecomment-2691557207

   When I run this seed on my system I see:
   ```
   :lucene:misc:test (SUCCESS): 63 test(s), 2 skipped
   The slowest tests (exceeding 500 ms) during this run:
      4.86s TestDirectIODirectory.testRandomByte (:lucene:misc)
   The slowest suites (exceeding 1s) during this run:
      8.18s TestDirectIODirectory (:lucene:misc)
   ```
   
   If i disable my tmpfs configuration so that it uses real filesystem:
   ```properties
   # disable in ~/.gradle/gradle.properties
   # tests.workDir=/tmp/lucene_gradle
   ```
   
   Then the seed takes forever. 
   
   100% of cpu is in kernel in `rep_stos_alternative` (copying bytes?) 


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