On 08/10/16 07:43, Grant wrote:
>>>>>> Swap usage on Linux always seems a little tricky to me. Should my
>>>>>> goal on a web server be zero swap usage, meaning the attached graph
>>>>>> should show no green lines at all if I'm doing it right?
> ...
Have you tuned swappiness?
e.g.:
vm.swappiness=1
vm.vfs_cache_pressure=50
You can force minimal use of swap as well as turn it off. I have tried
to go swap-less a few times and have come to the conclusion you are
trading occasional slow downs for the certainty of a crash and burn when
you hit an unexpected memory requirement. I have swap (2xram - mostly
for hibernation), but tune it as above.
rattus ~ # free
total used free shared buff/cache
available
Mem: 4041520 1605108 147588 19500 2288824
2083800
Swap: 4194300 356 4193944
rattus ~ #
BillK
