xinyiZzz opened a new pull request, #12960:
URL: https://github.com/apache/doris/pull/12960

   # Proposed changes
   
   Issue Number: close #xxx
   
   ## Problem summary
   
   1. When the physical memory of the process reaches 90% of the mem limit, 
trigger the load channel mgr to brush down
   2. The default value of be.conf `mem_limit` is changed from 90% to 80%, and 
stability is the priority.
   
   ## Checklist(Required)
   
   1. Does it affect the original behavior: 
       - [ ] Yes
       - [ ] No
       - [ ] I don't know
   2. Has unit tests been added:
       - [ ] Yes
       - [ ] No
       - [ ] No Need
   3. Has document been added or modified:
       - [ ] Yes
       - [ ] No
       - [ ] No Need
   4. Does it need to update dependencies:
       - [ ] Yes
       - [ ] No
   5. Are there any changes that cannot be rolled back:
       - [ ] Yes (If Yes, please explain WHY)
       - [ ] No
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   
   


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