topic Re: ps command and %CPU in Operating System - HP-UX

ps command and %CPU

OLIVA_1 — Tue, 01 Feb 2005 08:29:42 GMT

Hello,

I would like monitoring some proceses and I need to know the %CPU used.
With Solaris I can used the ps -aux command but it doesn't display %CPU field on HP-UX...

Someone can help me ?

Thanks,

Re: ps command and %CPU

OLIVA_1 — Tue, 01 Feb 2005 08:31:00 GMT

# /usr/ucb/ps -aux | more
USER PID %CPU %MEM SZ RSS TT S START TIME COMMAND
root 1617 2.1 22.8926424916624 ? S Jan 26 1949:14 /opt/eh55/bin/sys/
root 5252 0.1 0.1 1816 1344 pts/1 O 13:30:28 0:00 /usr/ucb/ps -aux
root 3 0.1 0.0 0 0 ? S Jan 26 15:20 fsflush
eh 1618 0.1 2.310068892960 ? S Jan 26 12:15 /opt/eh55/bin/sys/
root 463 0.0 0.312944 8992 ? S Jan 26 5:50 /opt/VRTSvmsa/jre/
root 2841 0.0 0.1 5840 2336 ? S 13:08:40 0:00 /usr/local/sbin/ss
root 5251 0.0 0.1 1248 992 pts/1 S 13:30:28 0:00 more
root 0 0.0 0.0 0 0 ? T Jan 26 0:00 sched
root 1 0.0 0.0 888 368 ? S Jan 26 2:26 /etc/init -

I would like the field %CPU

Thanks

Re: ps command and %CPU

Stephen Keane — Tue, 01 Feb 2005 08:35:26 GMT

Use top instead.

Re: ps command and %CPU

john korterman — Tue, 01 Feb 2005 08:35:45 GMT

Hi,
the top command in hpux can tell you the % usage of a process.
regards,
John K.

Re: ps command and %CPU

OLIVA_1 — Tue, 01 Feb 2005 08:39:27 GMT

I know top command displays %CPU... but I need a command which could be used in a shell script. Indeed I need to follow a process for a week.

Re: ps command and %CPU

john korterman — Tue, 01 Feb 2005 08:41:32 GMT

Hi again,
then try customizing, e.g.:
# UNIX95= ps -eo comm -o pcpu

notice the space before the ps comand. Consult the man page for ps.

regards,
John K.

Re: ps command and %CPU

OLIVA_1 — Tue, 01 Feb 2005 08:53:22 GMT

Thanks John !!!

It works properly.
Could you please explain me what does ti mean "UNIX95=" ?

And what I have some results up to 100%... for instanca I have a process which used 201.5 % of CPU ?

Thanks.

Re: ps command and %CPU

Kent Ostby — Tue, 01 Feb 2005 09:00:27 GMT

Oliva --

I use the following:

ps -ef | cut -c42-80 | sort -nr | head

This will list the top 10 processes by CPU from the PS command.

I'll use it a few times in a row to see what's eating the CPU right now.

Re: ps command and %CPU

Keith Bryson — Tue, 01 Feb 2005 09:09:41 GMT

Hi Oliva

You will have more than 100% CPU depending on how many CPUs you have. If you have 8 CPUs, you can run up to 800%.

The UNIX95 variable is set to enable XPG4 compatibility with certain commands. See 'man ps' for more information

Keith

Re: ps command and %CPU

john korterman — Tue, 01 Feb 2005 09:26:04 GMT

Hi,
In this case, when UNIX95 is not set, the ps command behaves in hpux as laid down for hpux.
Setting UNIX95 means using standard features of various unix flavours enabled by a group of persons referred to as the Xopen Posix Group. This means changing the whole behaviour of the ps command, gaining access to non-hp standard features.
However, setting UNIX95 may influence other commands then just ps, so I would recommend that you execute it only as specified with the space after the equal sign - if not, it is difficult to describe the influence on other commands.
I am sorry to say that I cannot explain why some commands use 200% cpu: is it a multiprocessor system where commands may take resources from more than a single cpu?
Perhaps others har better explanations.

regards,
John K.