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

Workstation Performance Optimazation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 18, 2017, 09:16
Default Workstation Performance Optimization
  #1
New Member
 
Gökhan Varol
Join Date: Nov 2014
Posts: 8
Rep Power: 6
Engineer_Gokhan is on a distinguished road
Hi all,

I have HP Z640 workstation with DUAL E5-2650 v3 processor. It have 10 cores and 2.3 Ghz for each processor.

PC also consist 8 number of 8GB DDR4-2133 ECC Registered RAMs for each RAM slot and 64 GB totally.

It also have 250 GB SSD and 2 number of 2 TB Harddisk.

I am going to be use this machine for ICE simulation with ANSYS Forte. I'm asking that what types of setting changes should I made to get best simulation solution time.

As I know, hyperthreading is useless for CFD so I disabled it. But I want to learn how many core should I use for simulation? (20,16,12,10, ?) My friend told that don't use all cores for simulation, ıt extends the simulation time, use max 16 core. Is it correct?

I also have to installed sofwtare to HD not SSD because of lack of disk space. Is it make sense on the simulation time?

Thank you very much in advance.

Edit: I run a simple case with total 20 cores and 10 cores useage. The results are very interesting. 10 core takes 17 minutes but 20 core takes 47 minutes. Why is there a huge difference?

Last edited by Engineer_Gokhan; September 18, 2017 at 13:09.
Engineer_Gokhan is offline   Reply With Quote

Old   September 19, 2017, 10:20
Default
  #2
New Member
 
Gökhan Varol
Join Date: Nov 2014
Posts: 8
Rep Power: 6
Engineer_Gokhan is on a distinguished road
Are there anybody for help me?
Engineer_Gokhan is offline   Reply With Quote

Old   September 19, 2017, 12:47
Default
  #3
Senior Member
 
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 792
Rep Power: 14
evcelica is on a distinguished road
There could be many reasons 20 cores was slower than 10. All problems are different though, some scale better than others, as do different codes.
- A small problem that does not distribute well will likely get slower as you are splitting up the problem too much, and adding overhead which outweighs the additional cores. Or it is memory bandwidth limited, not CPU limited, and adding extra cores again, just adds overhead. this is very likely with 20 cores and only 8 memory channels.
It doesn't matter where you install the software, other than program loading time. The working directory will affect your simulation time more if the program is using disk space for a swap drive (if you are solving out of core) and the SSD would help here. I'm not familiar with ANSYS Forte and if is uses disks for swap space?
evcelica 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
High performance workstation for CFD gunjan Hardware 3 September 14, 2015 03:10
High performance workstation Luigi Hardware 1 September 22, 2013 18:29
Dual cpu workstation VS 2 node cluster single cpu workstation Verdi Hardware 18 September 2, 2013 04:09
New workstation for different usage scenarios - CPU and RAM natem Hardware 6 August 7, 2013 03:47
How to configure a workstation hardware for best performance in ansys acasas Hardware 1 May 9, 2013 12:45


All times are GMT -4. The time now is 08:21.