G
gus
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here's a snippet of vmstat output: Note the "si" and "so" columns. These indicate pages read in and pages written (i.e. swapped) out. It is possible for some of the swap space to be in use but no paging going on, such as in this case. A typical system has lots of processes that are running only occasionally and those can be swapped out but nothing is wrong. These days, there is only demand paging in most systems. The idea of swapping out entire processes all at once has long been abandoned. To make things confusing, some systems use the demand pager to do file I/O. That can make it hard to distinguish paging from other I/O.
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