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Full Discussion: Monitoring Paging and Swapping
Operating Systems Solaris Monitoring Paging and Swapping Post 303027409 by javanoob on Saturday 15th of December 2018 03:15:40 AM
Old 12-15-2018
Hi Both,

Thank you for the detailed explanations.

To sumup,

- Virtual memory reservation does not take up physical space. (vmstat free still reflect as unused space, swap -l still reflect as free blocks)
- Virtual memory reservation is just a reserved amount and has nothing with the physical allocation of the ram / swap disk. In the sense that an allocated virtual memory area (non-shared) cannot be shared with another process, but the underlying physical ram could be randomly use by different processes at different time.

Please kindly let me know if my understanding thusfar is correct

===================

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 ?

Could it be at some point of time, i am running low on physical ram and swap/paging need to be done ?
When does physical space used in swapdisk be release ?

It is gradually increasing (slow.. but like 5-10MB more of swapdisk used per week) - that is the worrying part.

Regards,
Noob
 

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LEARN ABOUT HPUX

unlockable_mem

unlockable_mem(5)						     OBSOLETE							 unlockable_mem(5)

NAME

       unlockable_mem - OBSOLETE kernel tunable parameter

DESCRIPTION

       The tunable is obsolete and has been removed.

       Memory  locking	allows the privileged user to specify which pages need to remain in memory, and unaffected by the swap process.  This fea-
       ture allows you to ensure that memory access times are unaffected by delays introduced by memory paging and swapping.  For example, locking
       is  a  tool  provided  to privileged users on a system that is short on physical memory.  Instead of having these privileged processes swap
       like the rest of the processes, they can lock portions of their address space.  Once the pages are locked in for the privileged	processes,
       they will no longer have to worry about memory contention.  The unprivileged processes however, will have to compete for memory.

       provides you with a limiting factor on this privileged behavior, by setting the amount of memory which cannot be locked by user processes.

WARNINGS

       Installation  of  optional  kernel  software, from HP or other vendors, may cause changes to tunable parameter values.  After installation,
       some tunable parameters may no longer be at the default or recommended values.  For information about the effects of installation  on  tun-
       able  values,  consult  the documentation for the kernel software being installed.  For information about optional kernel software that was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

							     Tunable Kernel Parameters						 unlockable_mem(5)
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