16

I have a process that I would like to see how much memory it consumes while it is running.

Right now I do this:

ps faux | grep casper

But that just gives me the information of that moment. It would be nice to see that value changing as the script proceeds.

Any way I can do this?

14

Method 1

Run:

top

Check for the program's PID (first column), then run:

top -p PID

Method 2

Either paste this into the terminal or save it as a mem_usage.sh and run it from terminal.

#! /bin/bash
while :
do
    clear
    ps faux | grep casper
    sleep 1s
done
  • 1
    How can you change it from showing %? Out of interest :-) – Wilf Dec 17 '13 at 20:58
  • I get this when running the script: bash: ./memory_usage.sh: bin/bash: bad interpreter: No such file or directory – Hommer Smith Dec 17 '13 at 21:12
  • Bah! I have edited it! Should have checked it properly before posting. The first line should say where to run it from /bin/bash (I had bin/bash so it was checking locally in a folder called bin for bash) – Julian Stirling Dec 17 '13 at 21:31
  • 1
    @ wilf ps faux | grep casper | awk '{print $11} {print $6}' That should give you on one line the program name and the next the real memory size in kB. – Julian Stirling Dec 17 '13 at 21:34
6

To monitor only your process you can check /proc/PID/status or /proc/PID/statm.

About /proc/PID/statm :

After doing cat /proc/PID/statm you should see this :

611450 185001 883 18 0 593431 0

Explanation :

  1. size :- total program size (611450 X 4096/1024 = 2445800kB = 2388M)
  2. resident :- resident set size (185001 X 4096/1024 = 740004kB = 722M)
  3. share :- shared pages (883 X 4096 = 3532)
  4. trs :- text (code) (18 X 4096/1024 = 72kB = VmExe )
  5. drs :- data/stack
  6. lrs :- library (593431 X 4096/1024 = 2373724kB = VmData +VmStk)
  7. dt :- dirty pages

Also you can log the memory activity for your process doing a loop using date and cat.

3

you could use use 'top'

man top

This program allows you to sort the resource usage by, amongst others, RSS, VSZ, CPU, etc.. It's very useful.

Alternatively, for a more detailed breakdown of memory usage, try 'pmap'

man pmap

Example usage:

pmap -x 1234

cheers

sc.

  • 1
    With pmap -x PID, did you mean incredibly detailed usage :-) – Wilf Dec 17 '13 at 20:59
  • indeed - can never have enough detail :) – swisscheese Dec 17 '13 at 21:05
  • On mine (Ubuntu 16.04.5 LTS) "pmap -x" with the PID doesn't show anything other than the PID and the command. -X does the same. – orrd Sep 24 at 22:00
2

Open System Monitor, and go to the Processes tab:

1

Give a try to:

watch 'ps faux | grep -v grep | grep casper'

You may also change refresh interval using --interval <seconds> parameter.

  • 1
    You don't need the -v grep if you change the final one to grep [c]asper. That matches casper but not itself. – Wudang Jul 16 at 9:44

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