Re: [OpenIndiana-discuss] Question about System Monitor
From vmstat, the sr (scan rate) is better indicator - if you see sr column > 0, it means the kernel is spending time searching for usable memory pages, and if this does happen often, it is time to review the memory consumers/add more RAM. Toomas > On 8. Jul 2021, at 17:55, Richard L. Hamilton wrote: > > 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 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 wswap free re mfpi 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 66891 0 99 >> 0 0 0 49794916 48173452 1 431 344 0 0 00 49 23 25 0 18812 119079 >> 53181 9 3 88 >> 0 0 0 49782568 48159484 2 725 300 0 0 00 32 16 17 0 16908 121531 >> 53655 10 3 87 >> 0 0 0 49762892 48139892 0 754 218 0 0 00 33 17 17 0 20269 118644 >> 52612 10 3 87 >> 0 0 0 49735940 48112244 3 595 407 0 0 00 54 28 27 0 19599 119165 >> 53390 10 3 87 >> 0 0 0 49712360 48086132 2 476 244 0 0 00 37 19 19 0 19248 119117 >> 53090 10 3 87 >> 0 0 0 49692084 48064828 17 444 435 0 0 00 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 ___ openindiana-discuss mailing list openindiana-discuss@openindiana.org https://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] Question about System Monitor
On Thu, 8 Jul 2021, russell wrote: 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. Solaris likes to make reservations in advance to make sure that the promised allocation is available when it is used. This is different than Linux, which happily promises the same resources to any application which asks for them with the hope that they won't be used. Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer,http://www.GraphicsMagick.org/ Public Key, http://www.simplesystems.org/users/bfriesen/public-key.txt ___ openindiana-discuss mailing list openindiana-discuss@openindiana.org https://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] Question about System Monitor
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 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 wswap free re mfpi 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 66891 0 99 > 0 0 0 49794916 48173452 1 431 344 0 0 00 49 23 25 0 18812 119079 > 53181 9 3 88 > 0 0 0 49782568 48159484 2 725 300 0 0 00 32 16 17 0 16908 121531 > 53655 10 3 87 > 0 0 0 49762892 48139892 0 754 218 0 0 00 33 17 17 0 20269 118644 > 52612 10 3 87 > 0 0 0 49735940 48112244 3 595 407 0 0 00 54 28 27 0 19599 119165 > 53390 10 3 87 > 0 0 0 49712360 48086132 2 476 244 0 0 00 37 19 19 0 19248 119117 > 53090 10 3 87 > 0 0 0 49692084 48064828 17 444 435 0 0 00 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
