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Full Discussion: Monitoring Paging and Swapping
Operating Systems Solaris Monitoring Paging and Swapping Post 303024742 by jlliagre on Tuesday 16th of October 2018 05:55:25 AM
Old 10-16-2018
Quote:
Originally Posted by javanoob
My definition of sufficient memory = no swapping + no paging to physical swap file.
Solaris never swap (i.e. swap out a whole process memory) unless there is a severe shortage of RAM.

I agree significant pagination can strongly degrade performance but paginating once no more used pages (e.g. from some unused files written in /tmp or any tmpfs based file system) improves performance compared to keeping them in RAM.

The fact some of the swap area is used is not necessarily a symptom of RAM shortage.
This User Gave Thanks to jlliagre For This Post:
javanoob
 

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LEARN ABOUT BSD

swapon

SWAPON(8)						      System Manager's Manual							 SWAPON(8)

NAME

       swapon - specify additional device for paging and swapping

SYNOPSIS

       swapon -a
       swapon name ...

DESCRIPTION

       Swapon  is  used to specify additional devices on which paging and swapping are to take place.  The system begins by swapping and paging on
       only a single device so that only one disk is required at bootstrap time.  Calls to swapon normally occur in the system multi-user initial-
       ization file /etc/rc making all swap devices available, so that the paging and swapping activity is interleaved across several devices.

       Normally, the -a argument is given, causing all devices marked as ``sw'' swap devices in /etc/fstab to be made available.

       The  second  form gives individual block devices as given in the system swap configuration table.  The call makes only this space available
       to the system for swap allocation.

SEE ALSO

       swapon(2), init(8)

FILES

       /dev/[ru][pk]?b	   normal paging devices

BUGS

       There is no way to stop paging and swapping on a device.  It is therefore not possible to make use of devices which may be dismounted  dur-
       ing system operation.

       swapon is not implemented in 2.11BSD.

4th Berkeley Distribution					 November 17, 1996							 SWAPON(8)
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