How to find user memory usage in linux
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
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