[CentOS] swap being used?
Stephen Harris
lists at spuddy.orgSat Nov 1 16:15:02 UTC 2008
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> I have a machine with 64GB of memory in our lab. We have memory > demanding processes and natually swap gets used. However when these > processes are gone and the system is idle, we still see swap being > used. Is this normal behavior? Perfectly normal. If the pages that have been swapped out are not used then the system won't bother paging them back in again; keeps even more memory free for other uses. For example, my small 360Mb machine: % free total used free shared buffers cached Mem: 368844 330740 38104 0 14928 248348 -/+ buffers/cache: 67464 301380 Swap: 263160 560 262600 560K of swap in use even though there's 300Mb of free space; that 560K is just not in active use, so is better off on disk than in RAM. If you _really_ cared you could swapoff to force the pages back to RAM and then swapon again. But it's not worth it. -- rgds Stephen
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