| Soren Harward on 16 Apr 2015 09:51:54 -0700 |
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| Re: [PLUG] swappiness and ssd |
On Thu, Apr 16, 2015 at 10:24 AM, Anthony Martin <anthony.j.martin142@gmail.com> wrote: > We had a discussion about this on the G+ page. There really isn't a need for > a large amount of swap in most cases nowadays since we have so much physical > ram. Also as both Rich and Rich said the small performance increase you > would get isn't really worth the damage to you SSD. > > Anthony Martin > > Jr Linux System Administrator > > (M) 609-410-1168 > anthony.j.martin142@gmail.com > > > On Thu, Apr 16, 2015 at 10:21 AM, Rich Mingin (PLUG) <plug@frags.us> wrote: >> >> Rich Prime beat me to it. >> >> Increase swappiness for a small increase in performance and a variable to >> large amount of write wear on the SSD. >> >> Reduce swappiness to minimum for a small potential decrease in performance >> (depends on available memory), but minimizes wear on the SSD. >> >> On Thu, Apr 16, 2015 at 10:19 AM, Rich Freeman <r-plug@thefreemanclan.net> >> wrote: >>> >>> On Thu, Apr 16, 2015 at 10:01 AM, K.S. Bhaskar <bhaskar@bhaskars.com> >>> wrote: >>> > The default swappiness on Ubuntu systems is 60, and presumably takes >>> > into >>> > consideration the relative performance of writes to and reads from the >>> > swap >>> > file / partition. The ratio of write performance to read performance >>> > would >>> > be higher for SSDs than rotating media, since SSD reads are truly >>> > random >>> > whereas writes are in pages (in rotating media, seek and latency times >>> > would >>> > tend to apply to both). Therefore, it seems to me that if swap is >>> > located >>> > on SSD, we should increase swappiness, to encourage less frequently >>> > used >>> > pages to be written out, since they can be brought back in very fast >>> > when >>> > needed. Does that seem reasonable or am I missing something? Thanks. >>> >>> That completely makes sense, though keep in mind that swap on SSD is >>> likely to increase wear. >>> >>> -- >>> Rich >>> >>> ___________________________________________________________________________ >>> Philadelphia Linux Users Group -- >>> http://www.phillylinux.org >>> Announcements - >>> http://lists.phillylinux.org/mailman/listinfo/plug-announce >>> General Discussion -- >>> http://lists.phillylinux.org/mailman/listinfo/plug >> >> >> >> >> ___________________________________________________________________________ >> Philadelphia Linux Users Group -- >> http://www.phillylinux.org >> Announcements - >> http://lists.phillylinux.org/mailman/listinfo/plug-announce >> General Discussion -- >> http://lists.phillylinux.org/mailman/listinfo/plug >> > > > ___________________________________________________________________________ > Philadelphia Linux Users Group -- http://www.phillylinux.org > Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce > General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug > -- Soren Harward ___________________________________________________________________________ Philadelphia Linux Users Group -- http://www.phillylinux.org Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug