XiangpengHao commented on PR #8745:
URL: https://github.com/apache/arrow-rs/pull/8745#issuecomment-3475788578

   I'm pretty sure this has to do with things not under our control, and I 
wouldn't call it a regression, but system benchmark artifact.
   
   
   <img width="1050" height="570" alt="image" 
src="https://github.com/user-attachments/assets/1be2638b-cfc4-4b6a-99af-beb410fdab3e";
 />
   
   
   ⬆️ Both binary are the same, as evidenced by the same hash. But their 
performance is very very different. and it seems to has something to do with 
the filename length...
   
   
   ===========
   
   One more thing about page-faults:
   
   slow one:
   ```
    5,290,025      page-faults                      #  323.566 K/sec
   ```
   
   fast one:
   ```
   33,683      page-faults                      #    2.473 K/sec
   ```
   
   
   =====
   
   I have disabled ASLR, so it must come from some weird things in the glibc 
allocator...


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