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Full Discussion: AIX: PID 0 Process
Operating Systems AIX AIX: PID 0 Process Post 302335176 by zxmaus on Friday 17th of July 2009 12:56:16 PM
Old 07-17-2009
Hi,

what do you mean with 'if the system supports paging'? We tend to try avoid paging as good as we can Smilie

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 X11R4

chrt

CHRT(1) 							   User Commands							   CHRT(1)

NAME

       chrt - manipulate the real-time attributes of a process

SYNOPSIS

       chrt [options] priority command [argument...]
       chrt [options] -p [priority] pid

DESCRIPTION

       chrt sets or retrieves the real-time scheduling attributes of an existing pid, or runs command with the given attributes.

POLICIES

       -o, --other
	      Set scheduling policy to SCHED_OTHER.  This is the default Linux scheduling policy.

       -f, --fifo
	      Set scheduling policy to SCHED_FIFO.

       -r, --rr
	      Set scheduling policy to SCHED_RR.  When no policy is defined, the SCHED_RR is used as the default.

       -b, --batch
	      Set scheduling policy to SCHED_BATCH (Linux-specific, supported since 2.6.16).  The priority argument has to be set to zero.

       -i, --idle
	      Set scheduling policy to SCHED_IDLE (Linux-specific, supported since 2.6.23).  The priority argument has to be set to zero.

       -d, --deadline
	      Set  scheduling  policy to SCHED_DEADLINE (Linux-specific, supported since 3.14).  The priority argument has to be set to zero.  See
	      also --sched-runtime, --sched-deadline and --sched-period.  The relation between the options required by the kernel  is  runtime	<=
	      deadline	<= period.  chrt copies period to deadline if --sched-deadline is not specified and deadline to runtime if --sched-runtime
	      is not specified.  It means that at least --sched-period has to be specified.  See sched(7) for more details.

SCHEDULING OPTIONS

       -T, --sched-runtime nanoseconds
	      Specifies runtime parameter for SCHED_DEADLINE policy (Linux-specific).

       -P, --sched-period nanoseconds
	      Specifies period parameter for SCHED_DEADLINE policy (Linux-specific).

       -D, --sched-deadline nanoseconds
	      Specifies deadline parameter for SCHED_DEADLINE policy (Linux-specific).

       -R, --reset-on-fork
	      Add SCHED_RESET_ON_FORK flag to the SCHED_FIFO or SCHED_RR scheduling policy (Linux-specific, supported since 2.6.31).

OPTIONS

       -a, --all-tasks
	      Set or retrieve the scheduling attributes of all the tasks (threads) for a given PID.

       -m, --max
	      Show minimum and maximum valid priorities, then exit.

       -p, --pid
	      Operate on an existing PID and do not launch a new task.

       -v, --verbose
	      Show status information.

       -V, --version
	      Display version information and exit.

       -h, --help
	      Display help text and exit.

USAGE

       The default behavior is to run a new command:
	      chrt priority command [arguments]

       You can also retrieve the real-time attributes of an existing task:
	      chrt -p pid

       Or set them:
	      chrt -r -p priority pid

PERMISSIONS

       A user must possess CAP_SYS_NICE to change the scheduling attributes of a process.  Any user can retrieve the scheduling information.

NOTES

       Only SCHED_FIFO, SCHED_OTHER and SCHED_RR are part of POSIX 1003.1b Process Scheduling.	The other scheduling attributes may be ignored	on
       some systems.

       Linux' default scheduling policy is SCHED_OTHER.

SEE ALSO

       nice(1), renice(1), taskset(1), sched(7)

       See sched_setscheduler(2) for a description of the Linux scheduling scheme.

AUTHORS

       Robert Love <rml@tech9.net>
       Karel Zak <kzak@redhat.com>

AVAILABILITY

       The chrt command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux							   January 2016 							   CHRT(1)
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