10-16-2018
Quote:
Originally Posted by
javanoob
My definition of sufficient memory = no swapping + no paging to physical swap file.
Notice that, depending on which OS and which set of tuning parameters you use, there are two possible swap strategies: early swap allocation and late swap allocation. Late swap allocation means that swap is only used when the physical memory runs out. Early swap allocation means that as soon as a program is started as much swap is allocated as it might use once it is indeed swapped out. In such a case you would see paging activity and swap allocation immediately even if there is no swap really being used yet.
Late swap allocation is used predominantly these days but, for instance, in AIX prior to version 5.1 early swap allocation was the default. One regularly saw swap usage of 70%-80% even if the system had sufficient RAM installed. Only using
vmstat would then tell you if you are in trouble or not.
For a long-term monitoring you can use vmstat with a high interval but you also can configure
sar to tailor it to your needs (you may want to get some other usage statistics from it too). See the man page of
sar for details.
I hope this helps.
bakunin
This User Gave Thanks to bakunin For This Post:
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