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Full Discussion: Monitoring Paging and Swapping
Operating Systems Solaris Monitoring Paging and Swapping Post 303024734 by bakunin on Tuesday 16th of October 2018 04:40:26 AM
Old 10-16-2018
Quote:
Originally Posted by javanoob
My definition of sufficient memory = no swapping + no paging to physical swap file.
Notice that, depending on which OS and which set of tuning parameters you use, there are two possible swap strategies: early swap allocation and late swap allocation. Late swap allocation means that swap is only used when the physical memory runs out. Early swap allocation means that as soon as a program is started as much swap is allocated as it might use once it is indeed swapped out. In such a case you would see paging activity and swap allocation immediately even if there is no swap really being used yet.

Late swap allocation is used predominantly these days but, for instance, in AIX prior to version 5.1 early swap allocation was the default. One regularly saw swap usage of 70%-80% even if the system had sufficient RAM installed. Only using vmstat would then tell you if you are in trouble or not.

For a long-term monitoring you can use vmstat with a high interval but you also can configure sar to tailor it to your needs (you may want to get some other usage statistics from it too). See the man page of sar for details.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
javanoob
 

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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       The tunable is obsolete and has been removed.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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