How to divide 100 by the amount of logged in users?

Expedient · 07-27-2013, 03:51 PM

I wrote this bash script to call another script written in C that uses threads. My dedicated server can only support 100 threads being used at one time and I am going to be having multiple users on my dedicated server. I am trying to take 100 divided by the number of users logged in to my server so that each will have a fair share of threads. Example: 4 users are logged in to my server at a given time and all 4 are running my script. Each user will have an equal amount of threads that are being used. So 100/4 would be 25 threads per user. All I am trying to do is get 100 divided by the amount of users logged into my server, what would be the best way to do this? I know the 'who' command can tell you how many users are logged in but I don't really know how to use it. This should be pretty simple for most of you guys to do, I'm a Linux newbie. Cut me some slack lol.

haertig · 07-27-2013, 08:04 PM

Code:

$ USER_CNT=`who | cut -f1 -d ' ' | sort -u | wc -l`
$ let "result = 100 / $USER_CNT"
$ echo $result

haertig · 07-27-2013, 08:05 PM

Using 'cut' and 'sort' takes care of users that are logged in multiple times or have multiple terminal windows open (if they are accessing your system via a GUI).

haertig · 07-27-2013, 08:07 PM

Quote:

Originally Posted by Expedient

This should be pretty simple for most of you guys to do, I'm a Linux newbie. Cut me some slack lol.

I was wondering about that. You can write multi-threaded C programs, but not do simple math in the shell. Whatever, the above should work for you. Good luck!