I am trying to monitor the swapping activity in a Linux Server in the last, say, 1, 5 or 15 minutes.
One way is to run vmstat and keep watching si and so counters during these intervals.
However how can I check as a "one-shot" action (e.g. through a Nagios plugin) for a value showing the swapping activity during the aforementioned intervals?
In other words I need a way to instantly check whether my Server is actively swapping.
Believe you could use /proc/vmstat output, say with
cat /proc/vmstat | grep pswp command.
This will show you swap in and swap out counters.
Or:
only si:
vmstat 1 1 | awk 'NR == 1 {next} NR == 2 {for (i = 1; i <= NF; i++) fields[$i] = i; next} {split($0, data); item = data[fields["si"]]; print item; totals[fields["si"]] += item} NR >= 6 + 2 {exit}' only so:
vmstat 1 1 | awk 'NR == 1 {next} NR == 2 {for (i = 1; i <= NF; i++) fields[$i] = i; next} {split($0, data); item = data[fields["si"]]; print item; totals[fields["so"]] += item} NR >= 6 + 2 {exit}' 