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

Performance 1.5-dev with ggi

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 30, 2009, 12:51
Default Performance 1.5-dev with ggi
  #1
Senior Member
 
BastiL
Join Date: Mar 2009
Posts: 530
Rep Power: 20
bastil is on a distinguished road
Dear all,

I run a large case with about 30 million cells on 32 CPUs using openmpi1.6 from OpenFOAM build with mx-support. One iteration for this run takes about 80 seconds. Fluent uses about 60 seconds with the coupled solver, the seggregated solver is much quicker. My FLUENT setup is optimised, my FOAM setup is not (I do not really know how to do). This difference looks extremely large to me. What can this be caused by?

Thanks BastiL
bastil is offline   Reply With Quote

Old   June 30, 2009, 16:46
Default
  #2
Senior Member
 
BastiL
Join Date: Mar 2009
Posts: 530
Rep Power: 20
bastil is on a distinguished road
Some more infos to add:
FLUENT runs with HP-MPI and 2nd order upwind. OF with the central differencing schemes. I have read that these are quickest in OF.
I am not sure if the poor performance is caused by the ggis - I could try run a comparison case without ggi.

Regards BastiL
bastil is offline   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
Performance of GGI case in parallel hannes OpenFOAM Running, Solving & CFD 26 August 3, 2011 04:07
GGI ERCOFTAC and general questions david OpenFOAM Running, Solving & CFD 8 August 25, 2008 10:22
OpenFOAM Version 1.5 Released OpenFOAM discussion board administrator OpenFOAM Announcements from ESI-OpenCFD 0 July 14, 2008 19:22
P4 1.5 or Dual P3 800EB on Gibabyte board Danial FLUENT 4 September 12, 2001 12:44
CFX4.3 -build analysis form Chie Min CFX 5 July 13, 2001 00:19


All times are GMT -4. The time now is 05:12.