How to find user memory usage in linux - linux

Question

How i can see memory usage by user in linux centos 6
For example:
USER USAGE
root 40370
admin 247372
user2 30570
user3 967373

Answer 1

This one-liner worked for me on at least four different Linux systems with different distros and versions. It also worked on FreeBSD 10.
ps hax -o rss,user | awk '{a[$2]+=$1;}END{for(i in a)print i" "int(a[i]/1024+0.5);}' | sort -rnk2
About the implementation, there are no shell loop constructs here; this uses an associative array in awk to do the grouping & summation.
Here's sample output from one of my servers that is running a decent sized MySQL, Tomcat, and Apache. Figures are in MB.
mysql 1566
joshua 1186
tomcat 353
root 28
wwwrun 12
vbox 1
messagebus 1
avahi 1
statd 0
nagios 0
Caveat: like most similar solutions, this is only considering the resident set (RSS), so it doesn't count any shared memory segments.
EDIT: A more human-readable version.
echo "USER RSS PROCS" ; echo "-------------------- -------- -----" ; ps hax -o rss,user | awk '{rss[$2]+=$1;procs[$2]+=1;}END{for(user in rss) printf "%-20s %8.0f %5.0f\n", user, rss[user]/1024, procs[user];}' | sort -rnk2
And the output:
USER RSS PROCS
-------------------- -------- -----
mysql 1521 1
joshua 1120 28
tomcat 379 1
root 19 107
wwwrun 10 10
vbox 1 3
statd 1 1
nagios 1 1
messagebus 1 1
avahi 1 1

Answer 2

Per-user memory usage in percent using standard tools:
for _user in $(ps haux | awk '{print $1}' | sort -u)
do
ps haux | awk -v user=${_user} '$1 ~ user { sum += $4} END { print user, sum; }'
done
or for more precision:
TOTAL=$(free | awk '/Mem:/ { print $2 }')
for _user in $(ps haux | awk '{print $1}' | sort -u)
do
ps hux -U ${_user} | awk -v user=${_user} -v total=$TOTAL '{ sum += $6 } END { printf "%s %.2f\n", user, sum / total * 100; }'
done
The first version just sums up the memory percentage for each process as reported by ps. The second version sums up the memory in bytes instead and calculates the total percentage afterwards, thus leading to a higher precision.

Answer 3

If your system supports, try to install and use smem:
smem -u
User Count Swap USS PSS RSS
gdm 1 0 308 323 820
nobody 1 0 912 932 2240
root 76 0 969016 1010829 1347768
or
smem -u -t -k
User Count Swap USS PSS RSS
gdm 1 0 308.0K 323.0K 820.0K
nobody 1 0 892.0K 912.0K 2.2M
root 76 0 937.6M 978.5M 1.3G
ameskaas 46 0 1.2G 1.2G 1.5G
124 0 2.1G 2.2G 2.8G
In Ubuntu, smem can be installed by typing
sudo apt install smem

Answer 4

This will return the total ram usage by users in GBs, reverse sorted
sudo ps --no-headers -eo user,rss | awk '{arr[$1]+=$2}; END {for (i in arr) {print i,arr[i]/1024/1024}}' | sort -nk2 -r

Answer 5

You can use the following Python script to find per-user memory usage using only sys and os module.
import sys
import os
# Get list of all users present in the system
allUsers = os.popen('cut -d: -f1 /etc/passwd').read().split('\n')[:-1]
for users in allUsers:
# Check if the home directory exists for the user
if os.path.exists('/home/' + str(users)):
# Print the current usage of the user
print(os.system('du -sh /home/' + str(users)))