On Thu, 2003-02-27 at 09:03, Tru64 User wrote: > Mem: 2063808K av, 2048376K used, OR > Mem: 900940K av, 820660K used > > I am a bit confused with the output of "top" and > asking for further explanation. Reading its manpage > did not clear this out for me. > Without any users but me, logged in, doing nothing, > Mandy 9.0 (2.4-19mdk)& Mandy 8.2 (2.4-18mdk)resp. > shows mem used as above, which suggests all mem. used > pretty much. > However, no single processes added up, total this used > memory. > How else can i explain this to myself? > How else can i find out actual memory used/free? > > Interestingly, if and when i reboot, it starts out > with about 90% of that memory showing as free, as days > go by, it goes up, until "almost" mem_avail==mem_used, > then it stays constant until next reboot. >
Linux is using the free memory as buffers and file cache. If an application needs memory in use by these buffers/cache it will be freed. This means that your memory is not sitting around idle when it could be used to improve performance.
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