steveloughran commented on PR #7814:
URL: https://github.com/apache/hadoop/pull/7814#issuecomment-3085060479

   comparison execution time
   ```
   [INFO] Running org.apache.hadoop.fs.s3a.performance.ITestCreateFileCost
   [INFO] Tests run: 22, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
25.591 s - in org.apache.hadoop.fs.s3a.performance.ITestCreateFileCost
   ```
   
   note that both test runs were in a single process, so even if the log showed 
three test suites running at the same time, only one process is running
   ```
   37302 surefirebooter-20250717193759647_3.jar -Xmx4096m -Xss2m 
-XX:+HeapDumpOnOutOfMemoryError -XX:+IgnoreUnrecognizedVMOptions 
--add-opens=java.base/java.io=ALL-UNNAMED 
--add-opens=java.base/java.lang=ALL-UNNAMED 
--add-opens=java.base/java.lang.reflect=ALL-UNNAMED 
--add-opens=java.base/java.math=ALL-UNNAMED 
--add-opens=java.base/java.net=ALL-UNNAMED 
--add-opens=java.base/java.text=ALL-UNNAMED 
--add-opens=java.base/java.util=ALL-UNNAMED 
--add-opens=java.base/java.util.concurrent=ALL-UNNAMED 
--add-opens=java.base/java.util.zip=ALL-UNNAMED 
--add-opens=java.base/sun.security.util=ALL-UNNAMED 
--add-opens=java.base/sun.security.x509=ALL-UNNAMED 
--enable-native-access=ALL-UNNAMED
   ```
   
   I don't think that is good, because we do have shared state (filesystem 
cache etc) which will interfere with each other


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