CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FloEFD, FloWorks & FloTHERM

FloWorks and CPU usage?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 11, 2010, 03:47
Default FloWorks and CPU usage?
  #1
New Member
 
Christian V. Pedersen
Join Date: Mar 2010
Posts: 3
Rep Power: 7
cvp_dk is on a distinguished road
Hi all
I using FloWorks together with SolidWorks, And I have just received a new computer, itís a dual CPU configuration (total 8 cores, 12Gb ram etc.)
Now I was of course hoping that my simulation would run faster with this new computer.
But running the simulation only results in max 50% CPU usage? (And that is max. most of the time it shifts between 13-41%)
When starting the simulation it is asking how many CPUís (Cores)to use and is suggesting 8 by itself, but I donít see that happening.
Any one that can help getting the CPU usage up?


OS.: Windows7 X64
SolidWorks Premium 2010 X64 SP2.1
Flow Simulation 2010 SP2.0 Build:1148

BR.
Christian
cvp_dk is offline   Reply With Quote

Old   December 8, 2010, 14:00
Default
  #2
New Member
 
Join Date: Dec 2010
Posts: 14
Rep Power: 6
kskong is on a distinguished road
Hi, I am facing exactly the same problem as yours. Just wondering if you have figured out how to solve the problem so that we can maximize the CPU usage?
Thanks!
kskong is offline   Reply With Quote

Old   December 13, 2010, 02:01
Default
  #3
New Member
 
Christian V. Pedersen
Join Date: Mar 2010
Posts: 3
Rep Power: 7
cvp_dk is on a distinguished road
Hi kskong
No sorry i have not been able to solve the problem.
We have purchased a new CFD tool instead J, we are only using Flowoks for some simple backpressure calculations now.
And AVL Fire for the more advanced calculations.

BR.
Christian
cvp_dk is offline   Reply With Quote

Old   January 2, 2011, 12:17
Default
  #4
New Member
 
Scott Vader
Join Date: Aug 2009
Posts: 5
Rep Power: 7
Vader is on a distinguished road
I've found that I can load up all the threads by starting multiple sessions of Flow Sim. This works well for me since I've usually got a solution space to work through trying different features and values of the parameters.

Scott
Vader is offline   Reply With Quote

Old   March 23, 2011, 10:17
Default
  #5
JZB
New Member
 
Fred
Join Date: Aug 2010
Posts: 2
Rep Power: 0
JZB is on a distinguished road
Quote:
Originally Posted by cvp_dk View Post
Hi all
I using FloWorks together with SolidWorks, And I have just received a new computer, itís a dual CPU configuration (total 8 cores, 12Gb ram etc.)
Now I was of course hoping that my simulation would run faster with this new computer.
But running the simulation only results in max 50% CPU usage? (And that is max. most of the time it shifts between 13-41%)
When starting the simulation it is asking how many CPUís (Cores)to use and is suggesting 8 by itself, but I donít see that happening.
Any one that can help getting the CPU usage up?


OS.: Windows7 X64
SolidWorks Premium 2010 X64 SP2.1
Flow Simulation 2010 SP2.0 Build:1148

BR.
Christian
Hi
I'd check to see if you CPU's are using hyperthreading. I had a problem with a different CFD code when hyperthreading was enabled on an i7 duo core CPU. Effectively the computer had two physical cores but the machine could see 4 cores and the software could not cope with hyperthreading technology. Would try asking the vender as well
JZB
JZB is offline   Reply With Quote

Old   March 25, 2011, 03:46
Default
  #6
Senior Member
 
Boris Marovic
Join Date: Jul 2009
Posts: 378
Rep Power: 12
Boris_M is on a distinguished road
Hi all,
there shouldn't be a problem like that. If this exist you should contact your support.
In any case Hyperthreading shouldn't be used with any CFD or FEA code as the code tries to use all the cores you tell him which are physically not there and this is causing problems. Imagine a teacher tells you you have an imaginary second brain and now use it for your math homework to get it done faster. Good luck with that too.
This is basically tricking the processor while he waits for input and another programm could use the computation power to do something in that time. So you can compare it to the following real life case of: You are waiting for some customer to call you back for some information for his consulting work you do for him but in the mean time you'll do some other things instead of sitting dead in front of the phone waiting.

So you can use CPU power if a process is another process is waiting for example to get data from the slower hard drive but if all processors are used by the same programm then you can expect that the programm is programmed to work that way efficiently and therfore using all the cores more or less equally so you cannot tell it that it can use double the cores that in reality don't exist.

@ cvp_dk: may I ask what applications you use AVL and Floworks for?

Regards,
Boris
Boris_M is offline   Reply With Quote

Old   June 20, 2011, 08:57
Default
  #7
New Member
 
Christian V. Pedersen
Join Date: Mar 2010
Posts: 3
Rep Power: 7
cvp_dk is on a distinguished road
Hi Boris
Sorry for the very late reply.
Yes you may ask. We are using AVL fire for multiface simulations involving Urea and exhaust gas.
And we are using Floworks for the more simple stuf like pressure drop calculations of silencers.

Br. Christian
cvp_dk 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
Floworks computation problems drejki FloEFD, FloWorks & FloTHERM 1 March 3, 2010 21:49


All times are GMT -4. The time now is 05:21.