CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Can my machine do parellel processing

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 24, 2008, 03:51
Default Hello World. I'm woundering
  #1
Senior Member
 
sega's Avatar
 
Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 11
sega is on a distinguished road
Hello World.

I'm woundering if my machine can do parallel processing. Is there a list with supportet processors?

I'm using a Intel Core2Duo T7500 @ 2.2 GHz.

Greetings.
__________________
Schrödingers wife: "What did you do to the cat? It's half dead!"
sega is offline   Reply With Quote

Old   April 24, 2008, 04:07
Default Your machine has two cores, so
  #2
Member
 
Patricio Bohorquez
Join Date: Mar 2009
Location: Jaén, Spain
Posts: 94
Rep Power: 8
pbohorquez is on a distinguished road
Your machine has two cores, so YES you can. Decompose your domain in two subdomains with the utility decomposePar, and run the parallel case as indicated in the User guide, with np being 2.
pbohorquez is offline   Reply With Quote

Old   April 24, 2008, 04:13
Default Unfortunately I'm running my l
  #3
Senior Member
 
sega's Avatar
 
Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 11
sega is on a distinguished road
Unfortunately I'm running my linux-system in a virtual environment on a Windows machine.
I suppose the virtualbox is not supporting multiple cores.

When I do the steps to for parallel running and check the cpu workload with 'top' I have two solvers running with each nearly 50 % ...
That doesn't look like real parallel running ...
__________________
Schrödingers wife: "What did you do to the cat? It's half dead!"
sega is offline   Reply With Quote

Old   April 24, 2008, 04:35
Default On the other hand, if I run th
  #4
Senior Member
 
sega's Avatar
 
Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 11
sega is on a distinguished road
On the other hand, if I run the single solver, I get 100% workload in linux and 100% workload on EACH core in windows ...

Maybe thats all I can sqeeze out of my machine ...
__________________
Schrödingers wife: "What did you do to the cat? It's half dead!"
sega is offline   Reply With Quote

Old   April 24, 2008, 05:59
Default You should install Linux! http
  #5
Senior Member
 
Billy
Join Date: Mar 2009
Posts: 167
Rep Power: 8
billy is on a distinguished road
You should install Linux!

I suggest simulate a simple case like lid-driven cavity with 80x80 cells or so with 1 and 2 processes and compare the computation time.
billy is offline   Reply With Quote

Old   April 24, 2008, 12:54
Default We tested damBreak and found O
  #6
mellanoxuser
Guest
 
Posts: n/a
We tested damBreak and found OpenFOAM to be highly parallel. As # cores increase, the wall clock time greatly decreases - Check out also the InfiniBand topics under http://www.cfd-online.com/OpenFOAM_D...tml?1173649250
Most solvers have cases for each # procs (nproc2, nproc4...etc) and for cluster cofiguration, you just have to specify a hostfile with the mpirun command.

Hope this helps!
  Reply With Quote

Old   April 27, 2008, 10:14
Default Well I have tested my dam brea
  #7
Senior Member
 
sega's Avatar
 
Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 11
sega is on a distinguished road
Well I have tested my dam break problem.
Running in parallel it's just half the time.
Obviously the virtual environment does support miltiple cores.
__________________
Schrödingers wife: "What did you do to the cat? It's half dead!"
sega is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to use parellel mode with user cel function? frank CFX 3 November 15, 2008 15:50
Not able to copy the text file from one machine to another machine drive using Cgi script gtselvam OpenFOAM Bugs 2 October 22, 2007 06:44
I-Radiation Equation problem with CFX Parellel Scott CFX 2 January 9, 2007 21:39
parallel processing problem with multiproc machine hajra_rabaeto!!!!!!! FLUENT 2 January 28, 2006 20:11
64 Bit machine P FLUENT 7 June 24, 2005 13:17


All times are GMT -4. The time now is 19:28.