Message: Re: Heavily throttled job? Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

None Re: Heavily throttled job? 

Keywords: slow execution
Forum: Installation and Configuration
Re: Question Heavily throttled job? (Dennis Haggerty)
Date: 01 Feb, 2008
From: Joseph Perl <Joseph Perl>

HI Dennis.

I don't know if this will turn out to be it for you, but perhaps...

I had a very similar performance issue when I was running jobs are many different CPUs at the same time. It turned out that I had my code set to write out the current random seed after each event. Since all of my 100 jobs were all trying to write the seeds out to files on the same AFS volume, I got only about 5% of my CPU actually used. Solution was just to switch so that I only wrote the seed out at end of job, not end of event.

Are you writing a lot of random seeds out?

Are you running multiple jobs all using the same disk volume in some way?

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 None: Re: Heavily throttled job?   (Dennis Haggerty - 01 Feb, 2008)
3 None: Re: Heavily throttled job?   (Dennis Haggerty - 01 Feb, 2008)
1 None: Re: Heavily throttled job?   (Joseph Perl - 01 Feb, 2008)
(_ None: Re: Heavily throttled job?   (Dennis Haggerty - 04 Feb, 2008)
1 None: Re: Heavily throttled job?   (michel maire - 04 Feb, 2008)
...
3 None: Re: Heavily throttled job?   (Makoto Asai - 04 Feb, 2008)
...
5 None: Re: Heavily throttled job?   (Joseph Perl - 04 Feb, 2008)
...
 Add Message Add Message
to: "Re: Heavily throttled job?"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]