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#!/bin/bash
#
# vschedcalc - Calculate token buckets
# Copyright (C) 2005 Benedikt Boehm <hollow@gentoo.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
trap "exit 1" INT
echo ">> Welcome to the token bucket calculator"
echo ">> You need to enter some configuration options"
echo " Default values are shown in brackets"
echo
# get config values
echo -n "Kernel HZ value (1000): "
read hz
[ -z "${hz}" ] && hz=1000
while true; do
echo -n "Fill rate: "
read fillrate
[ -n "${fillrate}" ] && break
echo "!! Please enter a valid fill rate"
done
while true; do
echo -n "Avg. CPU usage in %: "
read avgcpu
[ -n "${avgcpu}" ] && break
echo "!! Please enter a valid CPU usage"
done
while true; do
echo -n "Max. burst time in sec: "
read maxburst
[ -n "${maxburst}" ] && break
echo "!! Please enter a valid burst time"
done
echo -n "Hold processes after burst in sec (0): "
read bursthold
[ -z "${bursthold}" ] && bursthold=0
# calculate token bucket
let interval=100*${fillrate}/${avgcpu}
let tokensmin=${hz}*${bursthold}*${fillrate}/${interval}
let tokensmax=${hz}*${maxburst}-${hz}*${maxburst}*${fillrate}/${interval}
echo
echo ">> Voila. Your token bucket looks like:"
echo "FillRate: ${fillrate}"
echo "Interval: ${interval}"
echo "TokensMin: ${tokensmin}"
echo "TokensMax: ${tokensmax}"
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