topic Re: System process in Operating System - HP-UX

System process

peterchu — Fri, 29 Jul 2005 18:38:15 GMT

We have a system user "dbauser" always run some process in the system , but sometimes , these processes will not stop automatically l we need to terminate the process manually , can suggest the method how to terminate the process that is run by "dbauser" and run/idle over 10 minutes ? thx

Re: System process

generic_1 — Sat, 30 Jul 2005 23:26:18 GMT

setup a cron job that does a ps -ef | grep dbauser. and look at the time the process has been running. Have the cron run every ten minutse to check for new ones. If your script finds a match, have it kill it.

Re: System process

peterchu — Sun, 31 Jul 2005 07:36:27 GMT

thx reply ,

I am new to write script , could provide me some help ? thx

Re: System process

twang — Sun, 31 Jul 2005 09:53:02 GMT

I would suggest that you should take a look at why these processes keep running. How about the state of these processes, were they hung or in running state?

Re: System process

peterchu — Sun, 31 Jul 2005 10:10:41 GMT

thx reply ,

all these are dead processes , the system run it normally but can kill the process automatically , could suggest a script ? thx

Re: System process

Pedro Tapia_2 — Sun, 31 Jul 2005 19:51:35 GMT

$ ps -fea |grep dbauser

Re: System process

Vibhor Kumar Agarwal — Mon, 01 Aug 2005 00:00:05 GMT

kill -9 `ps -aef | grep dbuser | awk ' { print $2 }'

Re: System process

Muthukumar_5 — Mon, 01 Aug 2005 01:01:52 GMT

You can terminate them as,

ps -u | awk '{ split($3,a,":"); if ( a[2] > 10 ) { print $1; }}' | xargs kill -9

or

kill -9 `ps -u dbauser | | awk '{ split($3,a,":"); if ( a[2] > 10 ) { print $1; }}'`

hth.

Re: System process

hangyu — Tue, 02 Aug 2005 01:59:16 GMT

thx Muth,
when run your script , it pop
sage: kill [ -s signal | -p ] [ -a ] pid ...
kill -l [ signal ]

it seems my system can't use "split" , could provide some help again ? thx in advance

Re: System process

Ralph Grothe — Tue, 02 Aug 2005 02:27:42 GMT

It's quite easy to script a reaper for the long running process.
But as someone else already replied you should better check what's causing this.

Anyway you can parse the PID (to send a signal to), and the elapsed time of the process).
In my example I send a "sleep 600" in the background, and I intend to shoot it if it was running for more than 3 mins.

1. parse pid and etime and store in vars

UNIX95= ps -o pid= -o etime= -C sleep|read pid etime

2. test if etime > 3 min. and shoot

[[ $(printf "%d" $(echo $etime|cut -d: -f1)) -ge 3 ]] && kill $pid

Ideally you would put the test (i.e. the [[ ]]) in a loop conditional block.

e.g.

until [[ $(printf "%d" $(echo $etime|cut -d: -f1)) -ge 3 ]];do sleep 10;done; kill $pid

There are hundred similar ways to implement this little functionality (probably better ones).

However, some caveat.
If the process you want to kill already has been running for several hours the etime format changes to HH:MM:SS
So your parsing would have to accomodate for such subtle nuissances.

Re: System process

Ralph Grothe — Tue, 02 Aug 2005 02:32:53 GMT

Rubbish, please forget the until loop example!
I was too quick clicking forgetting thinking.
You of course need to put the variable assignment of $etime within the loop's body to update the value.

Re: System process

hangyu — Tue, 02 Aug 2005 07:35:08 GMT

thx Ralph Grothe 's working,

I am not too understand the statement "UNIX95= ps -o pid= -o etime= -C sleep|read pid etime" , it seems no output to the system , could suggest simipler way ? thx in advance.