[CentOS] Event scheduling

John Summerfield debian at herakles.homelinux.org
Fri Feb 16 22:20:29 UTC 2007


Les Mikesell wrote:
> Frank M. Ramaekers wrote:
>> Sure I understand that, but If I wanted it to be within 15 seconds
>> response, I'd have to check 4times x 60 seconds x 60 minutes x 24 hours
>> per day.  Kind of a waste for a file that may or may not be transmitted
>> each day.
> 
> Usually any machine that can handle actually doing a job will have no 
> problem with the work checking and not doing it the rest of the time...
> If you are concerned about it, a stat() is pretty cheap compared to 
> starting a program to do it, so you might write a long-running program 
> to monitor for a new file or a timestamp change instead of starting one 
> every few seconds.  If you really want a file-event driven interface you 
> might look at dazuko.  http://www.dazuko.de/faq.shtml
> 


That's not a very good thing to do in a virtual machine (by way of 
example). Contemplate doing this in a zSeries box where there are likely 
100 or more virtual machines.



-- 

Cheers
John

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