On 08/10/16 08:26, Bill Kenworthy wrote: > 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 > >
Also, this is a read that may help: http://www.linuxjournal.com/article/10678 BillK
