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@jsarenik jsarenik/memstat-new.sh
Last active Jun 18, 2017

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Memstat script rewritten for POSIX shell and busybox tools. Heavily optimized compared to the original one.
#!/bin/sh
#Source : http://www.linoxide.com/linux-shell-script/linux-memory-usage-program/
#Parent : http://www.linoxide.com/guide/scripts-pdf.html
tabw=8
mark=40
test $(id -u) -eq 0 || {
echo "This script must be run as root" 1>&2
exit 1
}
get_process_mem ()
{
PID=$1
test -f /proc/$PID/status -a -f /proc/$PID/smaps || return 1
# count memory usage, Pss, Private and Shared = Pss-Private
both=$(busybox awk '/^Pss:/{pss+=$2} /^Private/{priv+=$2} \
END {print pss*1024 ":" priv*1024}' /proc/$PID/smaps \
)
test "$both" = "0:0" && return 0
Pss=${both%:*}
Private=${both#*:}
# count Pss and Private memory, to avoid errors
if test x"$Rss" != "x" -o x"$Private" != "x"
then
Shared=$((${Pss}-${Private}))
Name=$(busybox grep -e "^Name:" /proc/$PID/status | cut -d: -f2)
# keep all results in bytes
Sum=$((${Shared}+${Private}))
printf "$Name $Sum\n"
fi
}
E1=1024
E2=$(($E1*1024))
E3=$(($E2*1024))
#this function make conversion from bytes to Kb or Mb or Gb
convert()
{
value=$1
power=1
# convert while value is bigger than 1024
test $value -ge $E3 && { power=3; E=$E3; } || {
test $value -ge $E2 && { power=2; E=$E2; } || {
test $value -ge $E1 && { power=1; E=$E1; }; }; }
test -n "$E" \
&& value=$(echo $value | busybox awk "{printf \"%.2f\", \$1/$E}")
# this part get b,kb,mb or gb according to number of divisions
case $power in
0) unit=B;;
1) unit=KiB;;
2) unit=MiB;;
3) unit=GiB;;
esac
printf "${value} ${unit}"
}
TMPRES=$(busybox mktemp)
touch $TMPRES-1
touch $TMPRES-2
touch $TMPRES-3
trap "rm -rf ${TMPRES}*" INT QUIT EXIT
test $# -eq 0 && pids=$(cd /proc; busybox ls -1 | busybox grep "^[0-9]\+") || {
npids=""
pids=$*
for pid in $pids
do
if
test $pid -gt 0 2>/dev/null
then
npids="$pid $npids"
else
npids="$(busybox pgrep $pid) $npids"
fi
done
pids="$npids"
}
# sort result by memory usage
for i in $pids
do
get_process_mem $i
done | sort -gr -k 2 > ${TMPRES}-2
total=0
for Name in $(busybox cat ${TMPRES}-2 | awk '{print $1}' | sort -u)
do count=$(busybox grep -c "$Name" ${TMPRES}-2)
test $count -eq 1 && count="" || count="($count)"
Sum=$(busybox awk -v src=$Name '{if ($1==src) {sum+=$2}} END {print sum}' \
${TMPRES}-2)
total=$(($total+$Sum))
printf "${Name}${count} ${Sum}\n" >>${TMPRES}-3
done
cat ${TMPRES}-3 | sort -gr -k 2 | uniq > ${TMPRES}-1
#printf "Private \t + \t Shared \t = \t RAM used \t Program\n"
while read a b
do
charz=$(echo $a | busybox wc -c)
tabz=$((($mark-$charz)/$tabw))
printf "$a"
for i in $(busybox seq $tabz); do printf "\t"; done
echo $(convert $b)
done < ${TMPRES}-1
echo --------------------------------------------------------
echo total: $(convert $total)
echo ========================================================
@jsarenik

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jsarenik commented Jun 13, 2017

These were the comments in the original file which was basis of this version:

#Source : http://www.linoxide.com/linux-shell-script/linux-memory-usage-program/
#Parent : http://www.linoxide.com/guide/scripts-pdf.html
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