ps command - time field

nhatch · #1 (**permalink**) 05-12-2008

Hi all,

Can someone extending on what the time field is explaining in a ps command.

Man page only has this:
time The cumulative execution time for the process.

Is this a combined CPU time? if that is the case then it should be impossible to have a 00:00 time on any process.

Any ideas?

Cheers,
Neil

jim mcnamara · #2 (**permalink**) 05-12-2008

No. the seconds in 00:00 is a rounded value. Many processes use small amounts of CPU time, less than 1 ms. And yes it is parent + all children.

We are on a fast HPUX PA_RISC box. Most processes show 00:00 because they use a tiny amount of CPU time.

Code:

jmcnama  3002  2993  0 08:29:57 ?         0:00 sshd: jmcnama@pts/0
 jmcnama 11290  3005  1 10:13:53 pts/0     0:00 grep jmc
    root  2993  2175  0 08:29:51 ?         0:00 sshd: jmcnama [priv]
 jmcnama  3005  3002  0 08:29:57 pts/0     0:00 -ksh
 jmcnama  8732     1  0  Apr 29  ?         0:07 uzpletd a b
 jmcnama 11289  3005  2 10:13:53 pts/0     0:00 ps -ef

uzpletd is a daemon running in test mode for 14 days. All the other processes show 00:00.

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