yiguolei commented on PR #19389:
URL: https://github.com/apache/doris/pull/19389#issuecomment-1541867171

   This may have a large performance decrease. In this case, it means the block 
is allocated by scanner thread and used by fragment thread or released by 
fragment thread. In jemalloc, it will track the arena the memory is allocated 
from and it has to return the memory to the arena again when release. Every 
thread is bond to an arena. There will be lock or condition competition。


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