[Beowulf] scheduler and perl

Tue Aug 1 14:36:54 PDT 2006

Hi, Thanks, Joe.
 I am not meaning to "ban" anything immediately, I am just curious how often
this happen to the HPC community.
Perl/shell is really strong tool, one example is to use loop to submit huge
mount of jobs and puts burden on scheduler server, the other example is to have
one job sit idle and frequently to use system call to detect the job status and
resubmit jobs again and again; the other example is that use system call and ssh
to each node and run stuff and bypass the scheduler... It just drives me crazy

 How do you guys handle issue like this?


-----Original Message-----
From: Joe Landman [mailto:landman at scalableinformatics.com]
Sent: Tuesday, August 01, 2006 5:24 PM
To: Xu, Jerry
Cc: beowulf at beowulf.org
Subject: Re: [Beowulf] scheduler and perl

Hi Jerry:

   Its generally a good idea to talk to your users, understand what it 
is they are doing, and see if you can help them, rather than simply 
"banning" things.  The result of bans of deeply embedded practices 
usually results in some ... exciting ... meetings, emails, and telephone 

   That said, we use, and our products quite a bit of Perl to submit 
jobs, and it works fine.  If you are running into particular issues, why 
not discuss them here, and likely you will get lots of good answers back.


Xu, Jerry wrote:
> Hi, I am maintaining a cluster while lots user uses perl to submit tons of
> which seems to me like abusing the system.
> Does everybody meet the same situation? Many user us system call in the perl
> do "qsub", shall I ban this? I don't know exactly why it is bad, but it looks
> me really bad. Anybody can give me a good reason to ban it with better
> explanation?
> Sincerely
> Protein
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Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics LLC,
email: landman at scalableinformatics.com
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