[SUMMARY] Max Number of Jobs cron can handle ?

[Osama Ahmed]

Sorry for the late summary , but I had to wait for a period of time to
make sure of the results ! 

Credits to: 
 Lance Rochelle, Dave D, Michael Grice, Stephen Cawley, Sandwich Maker,
 Rich Kulawiec, Manoj Sharma, Casper Dik, Bertrand Hutin, Neil Hunt. 

- Cron is pretty Industry Standard, It Is reliable as long as the clock 
  on the machine is reliable, and can be safely used for mission 
  critical jobs.

- Cron has a limit to the maximum number of "concurrent jobs". This 
  limit is defined through /etc/cron.d/queuedefs.See queuedefs(4)
  You can adjust the number of cron jobs that will run simultaneously
with
  the /etc/cron.d/queuedefs file. You can also look
  in /var/cron/log to make sure that your cron jobs are running
properly.

- Many people run more than 200 cron jobs on their servers (i.e: apache 
  web servers for stat Generation).


- $UNIVERSE is a good commercial Cross Platform Job Scheduler
   http://www.orsyp.com/software_dollar_universe.asp

- ControlM (from BMC) this product can handle over 600 jobs  
 
http://www.bmc.com/products/proddocview/0,2832,19052_19429_23437_1521,00
.html


Thanks.

Cheers ! 

Osama Ahmed


-----Original Message-----
From: sunmanagers-bounces at sunmanagers.org
[mailto:sunmanagers-bounces at sunmanagers.org] On Behalf Of Osama Ahmed
Sent: Friday, July 04, 2003 11:14 AM
To: sunmanagers at sunmanagers.org
Subject: Max Number of Jobs cron can handle ?


Hi Gurus,
We are trying to use cron to schedule a mission critical job. My
colleagues said that cron is not reliable and had a limitation on the
number of jobs it can handle. They said that it only can handle 20 Job.

Questions in brief: 
  - Can I depend on cron to schedule a mission critical job ?
  - What is the max number of Jobs cron can handle ?
  - What are the popular products in the market that can reliably
schedule critical jobs ?

IWS.

Thanks.
Osama
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