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I am able to see the list of all the processes and the memory via 

ps aux

and going through the VSZ and RSS

Is there a way to sort down the output of this command by the descending order on RSS value?

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9 Answers 9

Reset to default
297

Use the following command:

ps aux --sort -rss

Check here for more Linux process memory usage

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  • 19
    note - if you want to see the top results it's helpful to pipe it into head like ps aux --sort -rss | head -n15 Commented Mar 26, 2015 at 15:38
  • 3
    I get error ps: illegal option -- - Commented May 19, 2016 at 18:27
  • @MiguelMota What if like this: ps aux --sort=rss ? Commented May 19, 2016 at 18:32
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    @coffeMug didn't work but this did ps aux | sort -rn -k 6 Commented May 19, 2016 at 18:41
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    @coffeMug not sure how to find the version but I'm on Mac OSX so maybe that's why Commented May 19, 2016 at 18:58
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A quick and dirty method is to just pipe the output of ps aux to the sort command:

$ ps aux | sort -rn -k 5,6

Example

$ ps aux | sort -rn -k 5,6 ... root 1584 0.0 0.0 22540 1236 ? S 07:04 0:01 hald-addon-storage: polling /dev/sr0 (every 2 sec) root 1575 0.0 0.0 22536 872 ? S 07:04 0:00 /usr/libexec/hald-addon-generic-backlight root 1574 0.0 0.0 22536 880 ? S 07:04 0:00 /usr/libexec/hald-addon-leds root 1565 0.0 0.0 22536 876 ? S 07:04 0:00 /usr/libexec/hald-addon-rfkill-killswitch saml 2507 0.0 0.0 22232 500 ? S 07:05 0:00 dbus-launch --sh-syntax --exit-with-session root 1671 0.0 0.0 22156 936 ? Ss 07:04 0:00 xinetd -stayalive -pidfile /var/run/xinetd.pid ...

This doesn't handle for the column headers which get mixed in with the output, but it's easy to remember on the command line, and is an acceptable way to do what you want when manually viewing this type of output.

Example

root 1791 0.0 0.0 4140 536 tty2 Ss+ 07:04 0:00 /sbin/mingetty /dev/tty2 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 996 0.0 0.0 0 0 ? S 07:04 0:01 [kdmflush] root 982 0.0 0.0 0 0 ? S 07:04 0:00 [kvm-irqfd-clean]

More tips

An additional tip would be to pipe the entire output to another command such as less. This allows you to look at the information a page at a time and also use the arrow keys and page up/down keys to scroll back and forth through the output.

$ ps aux | sort -rn -k 5,6 | less

If your output is wrapping a lot you can also utilize the -S switch to less, which will force all the output to stay on a single line instead. You can then use your arrow keys to move left/right/up/down to see all of it.

$ ps aux | sort -rn -k 5,6 | less -S

Sorting within ps

Certain versions of ps provide the ability to use --sort. This switch can then take keys that are either prefixed with a + or a - to denote the sort order...least to greatest or greatest to least.

Examples

vsz,-rss

$ ps aux --sort=vsz,-rss | head -5 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 2 0.0 0.0 0 0 ? S 07:03 0:00 [kthreadd] root 3 0.0 0.0 0 0 ? S 07:03 0:00 [ksoftirqd/0] root 4 0.0 0.0 0 0 ? S 07:03 0:01 [migration/0] root 5 0.0 0.0 0 0 ? S 07:03 0:00 [watchdog/0]

+vsz,+rss

$ ps aux --sort=+vsz,+rss | head -5 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 2 0.0 0.0 0 0 ? S 07:03 0:00 [kthreadd] root 3 0.0 0.0 0 0 ? S 07:03 0:00 [ksoftirqd/0] root 4 0.0 0.0 0 0 ? S 07:03 0:01 [migration/0] root 5 0.0 0.0 0 0 ? S 07:03 0:00 [watchdog/0]

-vsz,-rss

$ ps aux --sort=-vsz,-rss | head -5 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1832 0.0 0.0 2088924 3312 ? Sl 07:04 0:00 /usr/sbin/console-kit-daemon --no-daemon saml 3517 0.2 1.2 2073196 100492 ? Sl 07:06 0:34 /home/saml/.dropbox-dist/dropbox saml 3516 0.0 0.8 2071032 67388 ? Sl 07:06 0:07 /home/saml/.dropbox-dist/dropbox saml 2657 0.1 0.7 1580936 57788 ? Sl 07:05 0:27 nautilus
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  • 1
    will ps always output the columns in the way you expect sort to see/process them? Commented Aug 13, 2015 at 2:34
  • Depends on which version of ps Commented Aug 13, 2015 at 4:04
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    A ... | less is a good advice but sometimes your process has a huge command line and it clutters the output. In such cases ... | less -S works better. Commented Nov 17, 2016 at 23:54
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    @waste - good tip, just remember that -S truncates and so you may lose some of what you want to see, but otherwise good advice if you're only interested the left most columns. Commented Nov 18, 2016 at 2:54
  • @slm I am not sure that is the case for less -S. When you close less view everything disappears, but as long as you are in the view, you can scroll vertically but also horizontally. Copying might be difficult, though. Commented Nov 18, 2016 at 3:03
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Even if ps do not reflect the actual memory used, this command is pretty helpful.

ps -eo size,pid,user,command --sort -size | awk '{ hr=$1/1024 ; printf("%13.2f Mb ",hr) } { for ( x=4 ; x<=NF ; x++ ) { printf("%s ",$x) } print "" }'
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ps aux --sort -rss is nice:

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND user 5984 0.8 7.4 1632488 296056 ? Sl 06:30 6:18 /usr/lib/chromium-browser/chromium-browser --type=ren user 23934 21.7 6.0 1565600 241228 ? Sl 15:45 40:10 /opt/atom/atom --type=renderer --enable-experimental- user 5533 0.9 5.1 3154096 206376 ? SLl 06:30 6:47 /usr/lib/chromium-browser/chromium-browser --enable-p user 17306 1.7 4.9 1360648 196124 ? Sl 18:14 0:36 /usr/lib/chromium-browser/chromium-browser --type=ren user 22272 30.1 4.6 1347784 185032 ? Sl 18:43 1:54 /usr/lib/chromium-browser/chromium-browser --type=ren user 19318 0.6 3.3 1304324 133452 ? Sl 18:27 0:09 /usr/lib/chromium-browser/chromium-browser --type=ren user 22098 1.0 3.3 1298500 133216 ? Sl 18:43 0:04 /usr/lib/chromium-browser/chromium-browser --type=ren

but if you want to see memory and cpu usages by application (grouped by commands):

python3.6 sum_process_resources.py ==== CPU% ==== 0. /opt/atom/atom | 27.8 1. /usr/lib/chromium-browser/chromium-browser | 11.2 2. python3.6 | 11.0 3. /opt/google/chrome/chrome | 1.6 4. /usr/lib/xorg/Xorg | 1.4 5. /opt/Franz/franz | 0.7 ==== MEM% ==== 0. /usr/lib/chromium-browser/chromium-browser | 37.2 1. /opt/google/chrome/chrome | 11.3 2. /opt/Franz/franz | 10.6 3. /opt/atom/atom | 10.1 4. /usr/lib/xorg/Xorg | 2.0 5. com.google.android.gms.persistent | 1.4 ==== RSS MB ==== 0. /usr/lib/chromium-browser/chromium-browser | 1475.07 MB 1. /opt/google/chrome/chrome | 461.35 MB 2. /opt/Franz/franz | 429.04 MB 3. /opt/atom/atom | 402.18 MB 4. /usr/lib/xorg/Xorg | 78.53 MB 5. com.google.android.gms.persistent | 58.02 MB

code:

#sum_process_resources.py from collections import OrderedDict import subprocess def run_cmd(cmd_string): """Runs commands and saves output to variable""" cmd_list = cmd_string.split(" ") popen_obj = subprocess.Popen(cmd_list, stdout=subprocess.PIPE) output = popen_obj.stdout.read() output = output.decode("utf8") return output def sum_process_resources(): """Sums top X cpu and memory usages grouped by processes""" ps_memory, ps_cpu, ps_rss = {}, {}, {} top = 6 output = run_cmd('ps aux').split("\n") for i, line in enumerate(output): cleaned_list = " ".join(line.split()) line_list = cleaned_list.split(" ") if i > 0 and len(line_list) > 10: cpu = float(line_list[2]) memory = float(line_list[3]) rss = float(line_list[5]) command = line_list[10] ps_cpu[command] = round(ps_cpu.get(command, 0) + cpu, 2) ps_memory[command] = round(ps_memory.get(command, 0) + memory, 2) ps_rss[command] = round(ps_rss.get(command, 0) + rss, 2) sorted_cpu = OrderedDict(sorted(ps_cpu.items(), key=lambda x: x[1], reverse=True)) sorted_memory = OrderedDict(sorted(ps_memory.items(), key=lambda x: x[1], reverse=True)) sorted_rss = OrderedDict(sorted(ps_rss.items(), key=lambda x: x[1], reverse=True)) print("==== CPU% ====") for i, k in enumerate(sorted_cpu.items()): if i < top: print("{}. {} | {}".format(i, k[0], k[1])) print("==== MEM% ====") for i, k in enumerate(sorted_memory.items()): if i < top: print("{}. {} | {}".format(i, k[0], k[1])) print("==== RSS MB ====") for i, k in enumerate(sorted_rss.items()): if i < top: print("{}. {} | {} MB".format(i, k[0], round((k[1]/1024), 2))) if __name__ == '__main__': sum_process_resources()
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simple way is to install htop

in that you can sort process based on PID,Percentage CPU,MEM

more sophisticated

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As an alternative to the BSD style arguments shown in the other answers, one can use (at least using procps, shipped by Debian and Ubuntu):

ps -eF --sort=-rss
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  1. Run top command
  2. Shift + F to sort based on field (see the full menu below)
  3. Select n to sort based on memory usage

n: %MEM = Memory usage (RES)

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How to total up used memory by process name:

Sometimes even looking at the biggest single processes there is still a lot of used memory unaccounted for. To check if there are a lot of the same smaller processes using the memory you can use a command like the following which uses awk to sum up the total memory used by processes of the same name:

ps -e -orss=,args= |awk '{print $1 " " $2 }'| awk '{tot[$2]+=$1;count[$2]++} END {for (i in tot) {print tot[i],i,count[i]}}' | sort -n

e.g. output

9344 docker 1 9948 nginx: 4 22500 /usr/sbin/NetworkManager 1 24704 sleep 69 26436 /usr/sbin/sshd 15 34828 -bash 19 39268 sshd: 10 58384 /bin/su 28 59876 /bin/ksh 29 73408 /usr/bin/python 2 78176 /usr/bin/dockerd 1 134396 /bin/sh 84 5407132 bin/naughty_small_proc 1432 28061916 /usr/local/jdk/bin/java 7
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ps aux --sort -%mem

man ps will show you many usages.

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