How to find user memory usage in 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.