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

Parallel Efficiency

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 4, 2012, 16:12
Default Parallel Efficiency
  #1
New Member
 
Rambod Mojgani
Join Date: Jun 2010
Posts: 9
Rep Power: 7
rmojgani is on a distinguished road
If I have 2 case which scenario would be more efficient to solve several cases?

Assume I have 8 CPU cores and two case to be run.

1) using all the 8 cores for solving a case and then going to next
2) use 4 cores for each case , and run both cases simultaneously

Last edited by rmojgani; December 5, 2012 at 09:39.
rmojgani is offline   Reply With Quote

Old   December 5, 2012, 05:31
Default
  #2
Senior Member
 
RodriguezFatz's Avatar
 
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,099
Rep Power: 16
RodriguezFatz will become famous soon enough
2nd case is always faster! Running two different simulations at the same time will utilize the cpu much more than the solver can do it. Parallel programming (=1st case) can never use exactly 100% computational power of each cpu because of idle times, competiting processes, memory access and so on. Whereas running two different simulations on the same cpu nearly do not suffer from this.
__________________
The skeleton ran out of shampoo in the shower.
RodriguezFatz is offline   Reply With Quote

Reply

Tags
efficiency, parallel computing

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
Large case parallel efficiency lakeat OpenFOAM Running, Solving & CFD 69 October 27, 2012 03:11
OpenFOAM with Inifiband & parallel efficiency LijieNPIC OpenFOAM 15 June 23, 2011 05:10
Parallel efficiency and speedup info lakeat OpenFOAM Running, Solving & CFD 2 August 31, 2009 11:05
Parelleling Efficiency kassiotis OpenFOAM 0 June 19, 2009 14:12
Parallel efficiency channel flow maka OpenFOAM Running, Solving & CFD 1 December 8, 2005 13:58


All times are GMT -4. The time now is 08:17.