[TOOL] Init Script to automagically renice processes at boot

[FonderiaDigitale]

Hi.
I was involved in creating a metod to renice some processes which do not respond interactively (without using a scheduler).
So i created this script to perform this at boot time.
The script takes processes to be reniced from a convenient configuration file located at the standard gentoo conf dir /etc/conf.d; its syntax is pretty straight-foward.

Just edit these and then place it in your rc startup tree:

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chmod u+x /etc/init.d/renice
rc-update add renice default

/etc/init.d/renice

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#!/sbin/runscript
# renice
# license: GPL-2
# Author: Giovanni Ferri <giovanni@fonderiadigitale.it>
# This init script takes care of renicing programs specified in a
# table in /etc/conf.d/nice
# Refer to that file for help.

depend() {
	need local
	after xdm
}

start() {
	local processlist active pid processname pli
	local process=""
	local value=""
	local i=0
	local c=0
	local pids=0
	let pli=${#processlist[*]}-1
	conf=$(cat /etc/conf.d/nice 2>/dev/null|grep -v \#)
	[ -z "${conf}" ] && exit 1
	ebegin "Renicing programs"
	for item in ${conf}
	do
		if ((c==0))
		then
			process=${item}
			c=1
		elif ((c==1))
		then
			value=${item}
			case ${value} in
				-[0-9]|-[0-9][0-9]) 	;;
				+[0-9]|+[0-9][0-9]) 	;;
				[0-9]|[0-9][0-9])	value="-${value}" ;;
				*)			unset value 	;;
			esac
			let i=${i}+1
			if [ -z "${process}" ] || [ -z "${value}" ]
			then
				ewarn "Error at line ${i} in /etc/conf.d/nice: ${item}"
			else
				active="$(pgrep -l -d, ${process})"
				while [ -n "${active}" ]
				do
					string=${active%%,*}
					#active=${active##${string},}
					pid=${string%% *}
					let pids=${pids}+1
					processname=${string##* }
					renice ${value} -p ${pid} >/dev/null
					if [ ${pli} -eq 0 ] || ([ ${pli} -gt 0 ] && [ -n "${processlist[*]//*${processname}*}" ])
					then
						einfo " Reniced:\t[${value}]\t${processname}"
						eend $?
						processlist[${pli}]=${processname}
						let pli=${pli}+1
					fi
					[ "${active}" == "${string}" ] && unset active || active=${active//${string},}
				done
			fi
			c=0
		fi
	done
}

/etc/conf.d/nice

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# renicer configuration file
#
# Usage: a pair of values, the first for the exact
# name of a process, or a coherent pattern;
# the second one is the new unix nice value number,
# in the range -20/+19, where minor numbers mean
# faster system response;
# values without -/+ are considered to be meant -.

# Please consider that some programs, eg. OpenVPN
# have their own internal renicing mechanisms.
# Normally, filesystems and X11 should be reniced
# for a desktop machine.


# process	value(-29 to +19)

kcryptd		-18
xfslogd		-15
xfsdatad	-15
X		-19

I hope these will be useful to someone.

[ExZombie]

Hm, might be good, but I, for one, am already using this:

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      *  app-admin/verynice
      Latest version available: 1.1
      Latest version installed: 1.1
      Size of downloaded files: 36 kB
      Homepage:    http://www.tam.cornell.edu/~sdh4/verynice/
      Description: A tool for dynamically adjusting the nice-level of processes
      License:     GPL-2

It can also kill runaway processes, if they are listed as such and start eating the CPU for no reason.

[FonderiaDigitale]

didnt know that, thanks for pointing it out
mine is almost strcuted to be one-way for non-threading processes, i think.