Crontab

[Geofrey Rainey]

There's a condition known as busy waiting whereby a process
Loops continuously wasting CPU cycles as opposed to the process
Going into a wait state.
I wonder if sleeping a process wastes CPU cycles as described and
if so is there a better implentation of this?


-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of Reber, Simon
Sent: Monday, 20 April 2009 9:07 p.m.
To: General Red Hat Linux discussion list
Subject: RE: Crontab

Instead of doing this,
Simply build a script that has a content as follow:

while [ true ]
	do
	script1.sh
	sleep 30
done

It's much simpler and you don't need to run it via cron every minute.
	But you still can control the script and the start/stop via
cron.

Cheers,
Simon

>-----Original Message-----
>From: redhat-list-bounces at redhat.com
>[mailto:redhat-list-bounces at redhat.com] On Behalf Of Rohit khaladkar
>Sent: Monday, April 20, 2009 10:59 AM
>To: General Red Hat Linux discussion list
>Subject: Re: Crontab
>
>I guess you cannot have crontab entry in terms of seconds.But you can 
>create a script which would repeatedly run your script and give an 
>interval of 30 seconds.
>For eg, create a tmp.sh script which would run your desired script (say
>script1.sh) after every 30 seconds.
>
>Your tmp.sh script would look like
>
>#!/bin/sh
>script1.sh
>sleep 30
>script1.sh
>sleep 30
>script1.sh
>
>
>Make an entry in the crontab to execute this script every minute.
>
>This should solve the purpose. If anyone comes up with a better idea, 
>feel free to go ahead with that, but this is a workaround, if you are 
>stuck.
>
>Thanks!
>Rohit Khaladkar.
>
>On Mon, Apr 20, 2009 at 2:17 PM, ~~~0Pen ~~~ S0uRce ~~~ 
><vijay1313 at gmail.com
>> wrote:
>
>> Hi guys,
>>                     Do any one have  idea that how can i
>configure crontab
>> to run a script after every 30 seconds,i know about default
>parameters of
>> crontab and tried  google also,but could not find any thing.
>>
>> Any suggestion Please !!!!
>>
>>
>>
>> --
>> ~~~ 0Pen ~~~ S0uRce ~~~
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