REASY commented on issue #4973:
URL: https://github.com/apache/arrow-rs/issues/4973#issuecomment-1774918348

   If I run [collectl](https://collectl.sourceforge.net/) as `collectl -sB 
--verbose -oT` in parallel with different modes, here is what I see (OS level 
memory fragmentation), it looks quite similar to me, probably jemalloc is 
better in recycling previously allocated memory.
   
   ## page with default allocator
   ![MEMORY FRAGMENTATION SUMMARY (4K pages)_ Default allocator 
(1)](https://github.com/apache/arrow-rs/assets/5107562/1a966f5a-7cb1-4e91-93f4-21deae971cbd)
   
   ## page with jemalloc 
   ![MEMORY FRAGMENTATION SUMMARY (4K pages)_ jemalloc 
(1)](https://github.com/apache/arrow-rs/assets/5107562/d18fd00e-bf26-4cb6-9c2a-8d5428d93723)
   


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