Try the commands recommended here:
https://www.tecmint.com/commands-to-...sage-in-linux/
I think the output of iostat is interpreting that the swap space is "special" and showing that partition at 100%.
Note also that the output you've shown also says the following, at the bottom:
Quote:
MemTotal=16325868 MemFree=9407272 Buffers=3264928 Cached=595172 SwapTotal=8388472 SwapFree=8388472
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Therefore your swap space is actually 0% used.
iostat is probably looking at partition usage and swap space is special therefore the partition information is indicating that it is 100% in use.