Ubuntu – How to measure the execution time of a terminal process

command lineperformance

I'm trying to measure the execution time of a process that I call via the command line (i.e., I want to find out how long it takes to for the process to finish). Is there any command that I can add to the command calling the process that will achieve this?

Best Answer

Add time before the command you want to measure. For example: time ls.

The output will look like:

real    0m0.606s
user    0m0.000s
sys     0m0.002s

Explanation on real, user and sys (from man time):

real: Elapsed real (wall clock) time used by the process, in seconds.
user: Total number of CPU-seconds that the process used directly (in user mode), in seconds.
sys: Total number of CPU-seconds used by the system on behalf of the process (in kernel mode), in seconds.

`top`

Example of firefox. Find the PID:

ps -aux | grep -i firefox

Then you can use top -p pid:

top -p  3845

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`ps`

You can also use ps command, firefox pid is 3845

$ ps -p 3845 -o %cpu,%mem,cmd
%CPU  %MEM CMD
11.1  3.7 /usr/lib/firefox/firefox

I am not satisfied with the above mentioned commands, and I found something that you should be interested in.

Monit

sudo apt-get install monit -y

Edit the Monit Config File

sudo nano /etc/monit/monitrc

Enable the web interface

set httpd port 2812
# use address localhost # only accept connection from localhost
allow localhost # allow localhost to connect to the server and
# allow 192.168.1.0/255.255.255.0 # allow any host on 192.168.1.* subnet
allow admin:monit # require user 'admin' with password 'monit'

Checking process every 2 secons

## Start Monit in the background (run as a daemon):
set daemon 120 to only 2  # check process every 2 sec

Example Firefox

In the end copy paste the following command

check process firefox
matching "firefox"

Save and Exit

Check your syntax

Fix any problems found – it’s not too tough to figure out what’s going on.

sudo monit -t

Start (or restart) Monit

sudo service monit start

Visit the web interface

http://localhost:2812 if you’re running Ubuntu Desktop, or

Click on Firefox

You can also use these links for help and modify your process.

UPDATE

You can also configure an alert if firefox uses more than 250 MB of ram

check process firefox
matching "firefox"
if totalmem > 250.0 MB for 1 cycles then alert

You can also execute command

if totalmem > 250.0 MB for 1 cycles then exec "path to script"

You can also make a script of Notify-Send

/usr/bin/notify-send firefox "More Than 250 MB OF RAM"

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Ubuntu – How to make the top bar of the terminal say what command is running

Taken from Bash - Update terminal title by running a second command · U&L and slightly changed:

trap 'echo -ne "\033]2;$(history 1 | sed "s/^[0-9 ]* \+//")\007"' DEBUG

This (ab)uses the DEBUG signal as a trigger to update the title with the last entry from your history, i.e. the last command you executed, via an XTerm Control Sequence. Add the line to your ~/.bashrc to have the feature enabled in every new terminal window.

To print other command output alongside in the title, say the current directory with pwd followed by ": " and the currently running command, I recommend using printf as follows:

trap 'echo -ne "\033]2;$(printf "%s: %s" "$(pwd)" "$(history 1 | sed "s/^[0-9 ]* \+//")")\007"' DEBUG

Some terminal emulators allow you to specify a dynamic title and even give you the command name as an option so that you don't even need to fiddle around – I searched and found it in yakuake's profile settings.