how to determine cpu usage, memory usage, I/O usage by a particular user logged on li
 

Hello,

How can i collect statistics wrt amount of cpu used , amount of memory used, amouint of I/O done by a particular user logged into a linux system during a given time interval ?
How do i determine the amount of network traffic to/from a particular user logged in on a linux system?

thanks and regards
Raghu

Get all of the pids for the user with

I want to find the usage statistics for every user logged for every 5 minutes. Also I would prefer to write my code to determine instead of calling ps. CAn anyone show me the way here?

thanks and regards
Raghu

Well, there are a few things to consider...I mean, do you just want to write a shell-script, or do you want to actually write your own program, and what language?

If you are using C/C++ and libc, there are a few ways to do nearly what you want, but there is no magic function that will tell you what you want to know. The easiest ways is to read in the appropriate "files" in /proc. There's probably something much like you want in /proc/net, and also in /proc/sys/net, and other places. However, it's not a bad idea to just pipe to ps, since it's just scanning all of the processes that you're interested in anyway out of /proc, and then interpret the info it returns and format it for your own uses.

All of that should also be very straight forward. But no matter what you're going to have to do some scanning and formatting on your own to get the info you want.

--Xagafinelle

i want the updates for each user to be written to a separatye file so that when i do my periodic updating of my statlog database, i can update the values from the file to the databse. i dont mind how the stats end up i n the log file ie, whether by using C or shell script.pls let me know any way i can do this using C and libc as u mentioned.

thanks and regards
Raghu