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Operating Systems Solaris Monitoring Paging and Swapping Post 303027429 by jlliagre on Saturday 15th of December 2018 10:31:14 AM
Old 12-15-2018
Quote:
Originally Posted by javanoob
Back to the reason on the post

- I have 3GB of swap disk used (in swap -l)
- I have 10GB+ of free physical RAM
- I have 0 scanrate and vmstat available swap = 37GB

Since i am 10G of physical ram and 0 SR - i am not short on ram
Since i have 37GB of virtual swap available - i am not short on virtual swap

What could have contributed to the 3GB swap disk ?
Three gigabytes of memory were used (i.e. read/written) sometime in the past by some process(es). They have not been accessed for a while so the kernel decided to put the data on disk, to keep the free RAM high.
Quote:
Could it be at some point of time, i am running low on physical ram and swap/paging need to be done ?
You need not to starve on RAM for paging to occur.
Quote:
When does physical space used in swapdisk be release ?
When the processes owning it will die.
Quote:
It is gradually increasing (slow.. but like 5-10MB more of swapdisk used per week) - that is the worrying part.
That might be just some optimization done by the kernel.
There might be a memory leak in a process, 10 MB per week is not among the fiercest ones.
There might be a growing file in /tmp or any tmpfs based file system. The storage area of tmpfs is virtual memory (not any process virtual memory but the OS virtual memory, i.e. RAM + SWAP as Bakunin wrote).

Note also the free memory might be actually used by the kernel, which isn't constrained by process virtual memory rules.

Solaris uses free memory as UFS and NFS cache, so this free memory contains actual data, but it is nevertheless reported as free by vmstat and similar commands, because it is immediately available for processes allocations.

Last edited by jlliagre; 12-15-2018 at 06:36 PM..
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FREE(1) 							Linux User's Manual							   FREE(1)

NAME
free - display information about free and used memory on the system SYNOPSIS
free [-b|-k|-m|-g] [-l] [-o] [-t] [-s delay ] [-c count ] DESCRIPTION
free(1) displays the total amount of free and used physical memory and swap space in the system, as well as the buffers and cache consumed by the kernel. OPTIONS
Normal invocation of free(1) does not require any options. The output, however, can be fine-tuned by specifying one or more of the follow- ing flags: -b, --bytes Display output in bytes. -k, --kb Display output in kilobytes (KB). This is the default. -m, --mb Display output in megabytes (MB). -g, --gb Display output in gigabytes (GB). -l, --lowhigh Display detailed information about low vs. high memory usage. -o, --old Use old format. Specifically, do not display -/+ buffers/cache. -t, --total Display total summary for physical memory + swap space. -c n, --count=n Display statistics n times, then exit. Used in conjunction with the -s flag. Default is to display only once, unless -s was speci- fied, in which case default is to repeat until interrupted. -s n, --repeat=n Repeat, pausing every n seconds in-between. -V, --version Display version information and exit. --help Display usage information and exit FILES
/proc/meminfo -- memory information SEE ALSO
ps(1), top(1), vmstat(1) AUTHORS
Written by Robert Love. The procps package is maintained by Rik van Riel and Robert Love and was created by Michael Johnson. Send bug reports to <procps-list@redhat.com>. Linux 18 Nov 2002 FREE(1)
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