CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Serial Job Jumping from Core to Core

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 25, 2008, 12:15
Default Serial Job Jumping from Core to Core
  #1
Will
Guest
 
Posts: n/a
Hello, I'm running in Linux on an AMD Quad Core with a serial fluent case. My problem is that I cannot seem to set the core affinity and thus, the process is jumping from core to core all the time. This probably isn't that big of a deal but I would imagine it must be slowing the computations down some. I tried (set-affinity "0 1") hoping it would set the affinity for process 0 to core 1 but that doesn't seem to change anything. Anyone know the trick to doing this?
  Reply With Quote

Old   August 25, 2008, 12:21
Default Re: Serial Job Jumping from Core to Core
  #2
Charles
Guest
 
Posts: n/a
You can do it with taskset, however, me experience on a dual-core AMD processor was that it actually slowed it down a little. Having said that, I haven't tried it with the quad core yet, and I would expect different behaviour between AMD and Intel systems, and also between single and dual socket.

  Reply With Quote

Old   August 25, 2008, 15:21
Default Re: Serial Job Jumping from Core to Core
  #3
Renato Pacheco
Guest
 
Posts: n/a
it is normal to jump from core to core, since the processor knows by itself which is better to run the process. when I run it parallel, I can see that if the process is not using the full capacity, then it keeps on changing like what is happening to you.

it would be better if you run parallel on your quad core processor.
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
4 (one core) or 2 (double core) processors? Gen CFX 9 February 21, 2008 06:48
Core 2 Duo or AMD X2 philippose OpenFOAM 9 August 13, 2007 13:23
Questions about CPU's: quad core, dual core, etc. Tim FLUENT 0 February 26, 2007 15:02
Core 2 Duo vc. Dual Core Xeon 3060 Jan Main CFD Forum 6 February 20, 2007 07:21
dual core luigi FLUENT 3 October 28, 2005 19:17


All times are GMT -4. The time now is 05:02.