Because of the way swap is implemented on Solaris and descendants (on SVR4 in general, maybe), the vmstat "swap" column is very misleading; check output of swap -l (lower-case L option) instead, and if the free column is the same as the blocks column, no real swap is actually being used.
Likewise, all block disk I/O (including filesystem) goes though the paging mechanism, so the vmstat "pi" column just reflects reads or access via mmap. Given that the "po" column is zero, I doubt that you're actually paging out just to make room, although that's not a great indication, as file or block disk writes or pages written due to msync() would also probably count there. I suspect some of the misleading "swap" column change may also be due to files being created and written, or deleted, in tmpfs filesystems like /tmp and /var/run. > On Jul 8, 2021, at 10:40, russell <str...@willows7.myzen.co.uk> wrote: > > Hi, > > I am running Hipster 2021.04 with illumos-3f770aab81 and running System > Monitor 1.24.2. > System monitor is reporting Memory utilisation of 17.5GiB (27.5%) of 63.9GiB, > however it is reporting 115.7MiB (0.7%) of 15.9GiB of swap it being used. > I have always thought that swapping occurred when there is insufficient > memory for an application so another application or pages of an application > could be swapped to disk to free RAM. > Given that there at least 32GB of RAM free, surely it would not need to page. > > $ vmstat 30 > kthr memory page disk > faults cpu > r b w swap free re mf pi po fr de sr ro s0 s1 s2 > in sy cs us sy id > 0 0 0 68532576 60872200 33 244 41 0 0 0 55 8 4 4 -0 4516 > 11765 6689 1 0 99 > 0 0 0 49794916 48173452 1 431 344 0 0 0 0 49 23 25 0 18812 119079 > 53181 9 3 88 > 0 0 0 49782568 48159484 2 725 300 0 0 0 0 32 16 17 0 16908 121531 > 53655 10 3 87 > 0 0 0 49762892 48139892 0 754 218 0 0 0 0 33 17 17 0 20269 118644 > 52612 10 3 87 > 0 0 0 49735940 48112244 3 595 407 0 0 0 0 54 28 27 0 19599 119165 > 53390 10 3 87 > 0 0 0 49712360 48086132 2 476 244 0 0 0 0 37 19 19 0 19248 119117 > 53090 10 3 87 > 0 0 0 49692084 48064828 17 444 435 0 0 0 0 43 22 21 0 19950 119938 > 53753 10 3 87 > > While it is only around 100MB can I tweak the system to avoid paging when > there is so much ram? > > TIA > > Russell > > > > > _______________________________________________ > openindiana-discuss mailing list > openindiana-discuss@openindiana.org > https://openindiana.org/mailman/listinfo/openindiana-discuss > _______________________________________________ openindiana-discuss mailing list openindiana-discuss@openindiana.org https://openindiana.org/mailman/listinfo/openindiana-discuss
