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Delay in running script from crontab

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# 1  
Old 04-30-2013
Question Delay in running script from crontab
I am facing an issue where sometimes crontab is running script with some delay.

Below is the stmt in script and it is the only stmt in script.
Code:
echo "running at `date` " >> CRONCHECK.log

Below is the cron entry.
Code:
0 11 * * * CRONCHECK.sh

Below is the time of run each day.
Code:
running at Fri Apr 26 11:00:00 CDT 2013
running at Sat Apr 27 11:09:00 CDT 2013
running at Sun Apr 28 11:00:00 CDT 2013
running at Mon Apr 29 11:00:00 CDT 2013
running at Tue Apr 30 11:07:00 CDT 2013

Code:
uname -a 
SunOS servername 5.10 Generic_147440-25 sun4v sparc sun4v

could you please explain any possible reason for this odd behavior.
Thanks
# 2  
Old 04-30-2013
Is there any other job that is scheduled to run at the same time?
# 3  
Old 04-30-2013
yes there are 17 other scripts in cron out of them 7 will run at every hour at 00.
I am seeing this behavior of delayed run for other script also. Thanks.
# 4  
Old 04-30-2013
I think looking in syslog (or whatever the equivalent is on Sun OS) will help diagnose what is happening.
# 5  
Old 04-30-2013
how busy is the system.

include a "uptime" in the script and redirect the output to a log. check the uptime results in the log. compare it to what the regular load averages are.

your server may be under severe load, which is causing the latency. in other words, your system may be heavily pressed for CPU usage due to the other scripts that are running or queued to be running.
# 6  
Old 04-30-2013
server is not heavily loaded, I checked it many times and it stays between 12 - 14.
I am seeing this issue with other scripts also which is scheduled to run every 5 min but doesn't runs for many hours.

Code:
uptime
  5:13pm  up 46 day(s), 13:46,  2 users,  load average: 13.50, 13.64, 13.64

# 7  
Old 04-30-2013
Check /var/cron/log (cron by default directly logs to it - not to syslog)
e.g. for "queue max run limit reached".
This User Gave Thanks to MadeInGermany For This Post:
Nishant Singh
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