#!/bin/sh -e
#
# disk_io: calculate the disk io rate
#
# Copyright (C) 2010 Canonical Ltd.
# Copyright (C) 2011-2014 Dustin Kirkland
#
# Authors: Dustin Kirkland <kirkland@byobu.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, version 3 of the License.
#
# 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, see <http://www.gnu.org/licenses/>.
__disk_io_detail() {
if eval $BYOBU_TEST iostat >/dev/null; then
iostat -d -m -h
else
printf "%s\n" "Please install iostat if you want detailed information on your disk throughput"
fi
}
getdisk() {
local t=""
if [ -L "${1}" ]; then
t=$($BYOBU_READLINK -f "$1")
else
t="$1"
fi
t="${t##*/}";
[ -h "/sys/block/$t" ] && _RET="$t" || rtrim "$t" "0-9"
}
__disk_io() {
local part= i=
# Default to disk providing /, but let users override with MONITORED_DISK
[ -z "$MONITORED_DISK" ] && mount_point="/" || mount_point="$MONITORED_DISK"
# By default, we won't bug the user with the display of network traffic
# below DISK_IO_THRESHOLD in kB/s; override in $BYOBU_CONFIG_DIR/status
[ -n "$DISK_IO_THRESHOLD" ] || DISK_IO_THRESHOLD=50
case "$mount_point" in
/dev/*) part="${mount_point}";;
*) part=$(awk '$2 == mp { print $1 ; exit(0); }' "mp=$mount_point" /etc/mtab);;
esac
[ -e "$part" ] || return
getdisk "$part"
local disk=${_RET}
local t2=$(date +%s) t1=
for i in "read" "write"; do
local cache="$BYOBU_RUN_DIR/cache.$BYOBU_BACKEND/disk.$i"
t1=$(stat -c %Y "$cache") 2>/dev/null || t1=0
local unit="kB/s"
local rate=0 x1=0 x2=0 symbol= unit=
if [ $t2 -le $t1 ]; then
rate=0
else
[ -r "$cache" ] && read x1 < "$cache" || x1=0
local a1= a2= a3= a4= a5= a6= a7= a8= a9= a10=
read a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 other < "/sys/block/$disk/stat"
if [ "$i" = "read" ]; then
symbol="$ICON_RD"
[ -n "$a3" ] && x2="$a3" || x2=0
else
symbol="$ICON_WR"
[ -n "$a7" ] && x2="$a7" || x2=0
fi
printf "%s" "$x2" > "$cache"
rate=$((($x2 - $x1) / ($t2 - $t1) * 512 / 1024))
if [ $rate -lt $DISK_IO_THRESHOLD ]; then
# Below threshold, don't print
continue
elif [ "$rate" -lt 0 ]; then
rate=0
elif [ "$rate" -gt 1048576 ]; then
unit="GB/s"
fpdiv "$rate" 1048576 0
rate=${_RET}
elif [ "$rate" -gt 1024 ]; then
unit="MB/s"
fpdiv "$rate" 1024 0
rate=${_RET}
else
unit="kB/s"
fi
fi
if [ -z "$rate" ] || [ "$rate" = "0" ]; then
rm -f "$BYOBU_RUN_DIR/status.$BYOBU_BACKEND/disk_io"*
else
color b M W; printf "%s%s" "$symbol" "$rate"; color -; color M W; printf "%s" "$unit"; color --
fi
done
}
# vi: syntax=sh ts=4 noexpandtab
Mini Shell