How to get information about process in Linux

Question

How can I get process statistics from kernel and return the buf as

number of processes : ticks_user : ticks_system : ticks_interrupt : cpuseconds : procsizes : resident segment sizes

I found some information in /proc/[pid]/stat , but there is no data about ticks system, ticks_interrupt, cpusecond .

Where can I find info about these?

Any pointers to API or documentation will be helpful

Answer 1

Use

ps ax
top
htop

for the start, read the manpage, and for top/htop press h to get a help screen q to quit;

However, none of the manpages mentions ticks - what is it?

Answer 2

You may can give vmstat a try it is not in ticks, but why do you need ticks?

CPU These are percentages of total CPU time. us: Time spent running non-kernel code. (user time, including nice time) sy: Time spent running kernel code. (system time) id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time. wa: Time spent waiting for IO. Prior to Linux 2.5.41, included in idle. st: Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown.

What are you planing to do with this information?

Sometimes it may also to grep through the kernel sources, trying your buzzwords.