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Some % of RAM filled message when running Fluent

- June 6, 2023 at 9:13 am
  
  Mark O
  Ansys Employee
  
  When running Fluent you may see a message that some % of the RAM is filled. A typical message may look like
  WARNING: Rank:0 Machine ######## has 11 % of RAM filled with file buffer caches.This can cause potential performance issues. Please use -cflush flag to flush the cache.
  Such messages are quite common on linux machines. The advice to use -cflush on the fluent command line rarely makes any difference. It is an MPI issue in which MPI makes use of the /dev/shm file system for its shared memory mode implementation and it doesn't always clear out the memory leaving files that can only be deleted by root. It is not normally a problem unless the RAM gets very full. In which case the simplest thing is to reboot the machines since a reboot always clears out /dev/shm

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