View Full Version : system performance information using C/C++ in ubuntu

June 20th, 2009, 06:26 PM
well guys i am writing a C program which needs to maintain a log of system uses periodically for ubuntu 8.10
CPU uses
RAM uses etc

however i have got no idea how to implement it so any help will be useful.........

will i have to code the whole thing , better if i get some software from which i can extract the information???

June 20th, 2009, 06:50 PM
That information is tucked away in one of the files in the /proc directory, but I do not have any experience dealing with such. I know for the memory utilization, the file is /proc/meminfo. Perhaps the /proc/stat file can offer additional information.

In the distant past, when I was developing something similar for a Solaris workstation, I downloaded the source code for the 'top' application, and used the relevant portions to get the CPU utilization. I remember this being difficult, so it is probably not the first thing I would try today.

June 20th, 2009, 07:20 PM
Discover the possibilities of the /proc directory


June 20th, 2009, 08:18 PM
yeah just read the proc directory,
you can get swap info, mem info , cpu info from this.

But if you need harddrive usage I think you need to use stat/statvfs.h

I once did this systemmonitor program like this,
use the following

/proc/stat //cpu
/proc/meminfo //memory

//and the statvfs was something like

float hd_use;
char *filename;
struct statvfs diskinfo
if (!statvfs(filename, &diskinfo))
hd_use = (100*(1-(float)diskinfo.f_bavail/diskinfo.f_blocks));

good luck

June 20th, 2009, 10:26 PM
perl wrappers around other commands, easy and cross-platform.

June 22nd, 2009, 07:27 AM
well i think it can be done using command htop also..
htop is actually a command line system monitor...
its output can be written in a file for eg:
now one just needs to extract the required value from the file hello.txt