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flush and free file cache in linux--a command?

Cerb

Cerb

Elite Member
I'd like to find what my real idle RAM needs are. Is there a command to flush and free the file buffers that Linux uses, so that file cache will become free space, at least for some seconds? Sync frees a few MB, but that's it (and I know it doesn't need 450MB sitting at a blank KDE desktop 😉).
 
free -m, just count everything under cached as free too.

With recent kernels you can mess with /proc/sys/vm/drop_caches if you want (docs on what to do with it are in <kernel-source>/Documentation/proc.txt) but all you'll end up doing is causing a lot of disk activity as things are paged back in.
 
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