process time limit?

process time limit?

[Jim Reimer]

I have a script run by cron once every half hour which
gets a RADAR image, does some manipulation on the file,
and stores it.  It's been running fine for a few weeks
now.

However, when I got home from work today, the computer
was *very* sluggish, and 'ps' showed many many instances
of both the script and 'giftopnm' (one of the programs
used in the script).  I don't know what went wrong, but
giftopnm was hanging and not allowing the script to
complete.

So - is there any way to limit the amount of time a
cronjob (or any other job) can live?

Hints appreciated...

-jdr-
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Re: process time limit?

[Jos Lemmerling]

On Wed, 26 Jun 2002, Jim Reimer wrote:

> I have a script run by cron once every half hour which
> gets a RADAR image, does some manipulation on the file,
> and stores it.  It's been running fine for a few weeks
> now.
> 
> However, when I got home from work today, the computer
> was *very* sluggish, and 'ps' showed many many instances
> of both the script and 'giftopnm' (one of the programs
> used in the script).  I don't know what went wrong, but
> giftopnm was hanging and not allowing the script to
> complete.
> 
> So - is there any way to limit the amount of time a
> cronjob (or any other job) can live?

Check out if the previous executed script is still running, if so,
kill 'giftopnm' first or don't start a second one.

something like this:
#!/bin/bash

tempfile="/tmp/tmpfile_giftopnm"

if [ test -r $tempfile ]; then 
	exit
	# or kill the troublemaker:
	kill `pidof giftopnm`
	# or: 
	killall giftopnm
fi

touch $tempfile

<your part of the script here>

rm $tempfile



If you want to make sure the cronjob doesn't kill a giftopnm program the
cronjob didn't start, you'll have to make sure the knows the PID of that
program or script (which was started by cron). You'll probarly have to use
the temperary file to store the PID.


If you want to check it more often, created a new cronjob for this (and a
seperate script), about 10 minutes or so after the main-script started.


HTH

--
Jos Lemmerling on Debian GNU/Linux			jos(@)lemmerling(.net)



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Re: process time limit?

[James Mohr]

This does not specifically address your question, but I think this is actually
the answer you wanted:

http://www.linux-tutorial.info/cgi-bin/display.pl?266&0&0&0&3

regards,

jimmo

On Thursday 27 June 2002 01:39, Jim Reimer wrote:
> I have a script run by cron once every half hour which
> gets a RADAR image, does some manipulation on the file,
> and stores it.  It's been running fine for a few weeks
> now.
>
> However, when I got home from work today, the computer
> was *very* sluggish, and 'ps' showed many many instances
> of both the script and 'giftopnm' (one of the programs
> used in the script).  I don't know what went wrong, but
> giftopnm was hanging and not allowing the script to
> complete.
>
> So - is there any way to limit the amount of time a
> cronjob (or any other job) can live?

-- 

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