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Crontab Rescheduling

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# 1  
Old 01-18-2010
Crontab Rescheduling
Hi,

I want to weekly schedule a script execution (using crontab) but only if the system load is low. My question is: If the script does not be executed ( because of high load ) how can I re-schedule the cronjob to run after some minutes? I want the re-scheduling to be executed until the final execution of my script.
# 2  
Old 01-18-2010
one way;
you can create a wrapper script, put your logic and call the main script based on the condition required, and schedule in cron.
# 3  
Old 01-18-2010
You could write 3 Cronjobs. 1 that checks if there is high load and writes a flag file for it, where the name or content of that flag file signals if load is high or low.
The other two scripts are one for the weekly runs, the other interval. Both scripts check what kind of flag file is set and if not, then it doesn't run.
# 4  
Old 01-18-2010
Or put a little 'while' or 'until' loop with a sleep at the beginning of the script to wait until the system load is low enough.
# 5  
Old 01-19-2010
Put a script in cronjob so it is invoked according to your schedule.
Add your logic to check the load, if high load then schedule the script to run say after 5 mins using at and exit. If load is normal/low execute the script.
your script should be like:
Code:
 
checkload
if load is high then
  at  <--- call self in background 
  exit.
else
  execute your code.

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