How to record a process's CPU usage and dump it out??

[neyshule]

Hi all:
I want to monitor the CPU usage of a process which running for one hour, I know top can show all the stuff on screen but I want to record the usage in a file so that it can be used later, is there any tools that can achieves this??

[rmsharkey]

You can know the pid of the process and open it's /proc/<pid>/stat file. Times are in jiffies.
The fields are:

pid process id
tcomm filename of the executable
state state (R is running, S is sleeping, D is sleeping in an uninterruptible wait, Z is zombie, T is traced or stopped)
ppid process id of the parent process
pgrp pgrp of the process
sid session id
tty_nr tty the process uses
tty_pgrp pgrp of the tty
flags task flags
min_flt number of minor faults
cmin_flt number of minor faults with child's
maj_flt number of major faults
cmaj_flt number of major faults with child's
utime user mode jiffies
stime kernel mode jiffies
cutime user mode jiffies with child's
cstime kernel mode jiffies with child's