Errors in reported memory

[dormant]

I have just started using sysstat/sar/ksar, so might be doing something stupid. But my plots of memory usage are nothing like reality.

This is what sar reports:

$ sar -r -f /var/log/sysstat/sa10
Linux 5.18.0-2-amd64 (opsproc3) 10/08/22 x86_64 (12 CPU)

00:00:02 kbmemfree kbavail kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty
00:10:01 2751536 20160848 11453448 35.25 1807816 13886772 17495276 52.24 5863556 20914168 5264
00:20:01 2722236 20133256 11479196 35.33 1810128 13886860 17628556 52.64 5866120 20957396 4776
00:30:01 2725008 20157920 11456356 35.26 1812612 13905736 17495656 52.24 5869744 20953420 3980

And this is from ksar:

[PeterPitterling]

ksar 5.0.6 is ancient. This is a fork from an even later version 5.1.beta-* and further developed in the past years.
We don't give support for this old version. I would strongly recommend to use a newer build https://github.com/vlsi/ksar/releases/tag/v5.2.4-snapshot.10-gf068072 or even better take the last source and build yourself.