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Operating Systems
AIX
AIX: PID 0 Process
Post 302335176 by zxmaus on Friday 17th of July 2009 12:56:16 PM
07-17-2009
Moderator
Hi,
what do you mean with 'if the system supports paging'? We tend to try avoid paging as good as we can
AIX uses paging space as virtual memory ... usually hdisk6 but you can define further paging areas.
lsps -a shows you details about your paging areas, eg number, location, size, usage and anything else.
AIX cannot run without a paging area - it will not start at all, so you need to have at least a small one small paging area in your rootvg - further paging areas can be defined as you like.
You can tune the virtual memory manager how to use this paging area - eg to page out only noncomputational memory in case of need but whenever you are drastically exhaust the amount of real memory in your box, the system will use the paging area for everything - fighting for survival. And once the paging space is full, the box will either start forking and killing processes randomly - or restart itself.
Hope that helps
kind regards
zxmaus
what do you mean with 'if the system supports paging'? We tend to try avoid paging as good as we can
AIX uses paging space as virtual memory ... usually hdisk6 but you can define further paging areas.
lsps -a shows you details about your paging areas, eg number, location, size, usage and anything else.
AIX cannot run without a paging area - it will not start at all, so you need to have at least a small one small paging area in your rootvg - further paging areas can be defined as you like.
You can tune the virtual memory manager how to use this paging area - eg to page out only noncomputational memory in case of need but whenever you are drastically exhaust the amount of real memory in your box, the system will use the paging area for everything - fighting for survival. And once the paging space is full, the box will either start forking and killing processes randomly - or restart itself.
Hope that helps
kind regards
zxmaus
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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)