On Thu, 1 Mar 2018 17:27:43 +0000 (UTC), bob prohaska  wrote:

> Is there a program equivalent to swapinfo for Rasbian? I'm
> using a Pi3 with the latest version of Rasbian. The machine
> is configured to use dphys-swapfile, I've added a USB flash
> swap drive and I'd like to see the effect of adding a second
> USB flash drive. It's hard to understand what's going on without
> some utility to compare usage.
>
> I've tried using apt-get install swapinfo, but it's not found.
> Is there something lurking under a different name?
>
> Thanks for reading,
>
> bob prohaska

The htop utility can show swap usage in text or a bar graph.
apt-get install htop # I think

Active swap I/O can be observed with vmstat, si=swap in, so=swap out.

 $ vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system--
------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
st
 2  0  78356  35572   7312 828852    0    0     3     1    5    2  1  1 94  4 
0
 0  0  78356  35548   7312 828868    0    0     0     0  585  310  2  0 98  0 
0
 0  0  78356  35516   7312 828868    0    0     0     0  603  304  4  0 96  0 
0
^C

 $ vmstat -s
       949580 K total memory
        77908 K used memory
       416096 K active memory
       439448 K inactive memory
        31540 K free memory
         7304 K buffer memory
       832828 K swap cache
      1048572 K total swap
        78356 K used swap
       970216 K free swap
     11641959 non-nice user cpu ticks
      1224944 nice user cpu ticks
      5878433 system cpu ticks
    850078619 idle cpu ticks
     36563871 IO-wait cpu ticks
            0 IRQ cpu ticks
      1979324 softirq cpu ticks
            0 stolen cpu ticks
   1019055220 pages paged in
    784013486 pages paged out
        33886 pages swapped in
       100472 pages swapped out
   2317299646 interrupts
   1395971095 CPU context switches
   1517672408 boot time
      1935316 forks

Hope this helps,
--
Regards,
Kees Nuyt

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