I haven't verified if this actually fixes the problem but it seems to
make a huge difference in 'free' memory as shown by 'free'.
I had already closed my VMs by the time I tried this so haven't verified
if it stops the long freezes yet.
total used free shared buff/cache available
Mem: 31030 5331 2790 5347 22907 19900
Swap: 32767 3130 29637
echo 3 > /proc/sys/vm/drop_caches
total used free shared buff/cache available
Mem: 31030 5349 17122 5312 8557 19915
Swap: 32767 3130 29637
Notice the 2790 -> 17122 change above in 'free', and 22907 -> 8557 for
buff/cache.
It appears the kernel doesn't get rid of cache in a reasonable timeframe
at the expense of swapping programs out to disk while i/o is happening,
which causes gui freezes.
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https://bugs.launchpad.net/bugs/1852001
Title:
KDE GUI freeze on high disk IO
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