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

ANSYS Workbench hardware optimization

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

Like Tree3Likes
  • 2 Post By Jeggi
  • 1 Post By Christophe

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 13, 2018, 18:59
Default ANSYS Workbench hardware optimization
  #1
New Member
 
Join Date: Mar 2018
Posts: 9
Rep Power: 4
DenEnc is on a distinguished road
Hi everybody!

I'm using Workbench for my PhD in Orthodontics and I'm a real noob because I'm an auto-didact in using this software.

I just bought a high performance laptop with the following config:

- CPU: Intel Core i7-8700K 3.60 GHz (HC-HT, 12M..
- RAM: 32 GB DDR4 2.666MHz CL15 (2x16.384MB)
- SSD (M.2): 1.0 TB Samsung 960 PRO NVMe
- HDD: 1.0 TB Hybrid SSHD Firecuda S.ATA III
- RAID: No RAID
- Display: 15,6" FullHD 1.920x1.080 120Hz G-SY..
- Video Card: NVIDIA GeForce GTX 1060 6,0 GB GDDR5

My idea was to use the HDD to run windows and all other software while using the SSD to run only Workbench.

My simulations are really huge (>300gb files) and the out-of-core simulation is assured even with bigger size of RAM. So, I thought that keeping 1tb SSD would have been the best solution, 'cause on the university workstation it worked pretty well.
However, on my laptop when the solving process starts, everything gets stucked because the HDD becomes 100% active and freezes any other task, while the activity for SSD is around 1-2%.

I tried installing ANSYS directly on SSD and nothing changed. Does somebody know if there is any setting to make only the SSD working for ANSYS without installing windows directly on the SSD?
DenEnc is offline   Reply With Quote

Old   March 14, 2018, 02:27
Default
  #2
New Member
 
Jógvan
Join Date: Feb 2014
Posts: 22
Rep Power: 8
Jeggi is on a distinguished road
I guess this is what you are looking for: https://superuser.com/questions/2378...-disk-location
flotus1 and DenEnc like this.
Jeggi is offline   Reply With Quote

Old   March 15, 2018, 21:58
Default
  #3
Member
 
Join Date: Jan 2015
Posts: 62
Rep Power: 7
Christophe is on a distinguished road
Generally would say it's a bad idea to run large simulations on a laptop. Probably don't have enough memory anyways. I would use one of ANSYS's cloud partners to "rent" a cluster spot in AWS or Azure if you're not going to either simplify your model or buy a better workstation. You can get really good deals on used equipment.

I think if you put your Workbench file in a folder in the secondary drive, and start it from there it will put the scratch folder there. You can also change scratch file location in ANSYS mechanical settings, if you're doing a structural (I assume??).
DenEnc likes this.
Christophe is offline   Reply With Quote

Old   March 19, 2018, 13:17
Default
  #4
Senior Member
 
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 981
Rep Power: 18
evcelica is on a distinguished road
Christophe is correct. You should save the whole project file to the SSD. Then that folder in the SSD will then be your "working directory". It does not matter where ANSYS is installed, just where you are working on the file from.
You may need to set a paging file for the SSD if there is not already one made, as Jeggi shows.
evcelica is offline   Reply With Quote

Old   March 19, 2018, 16:10
Default
  #5
New Member
 
Join Date: Mar 2018
Posts: 9
Rep Power: 4
DenEnc is on a distinguished road
Thank you everybody,

moving paging file to SSD solved the issue I had, but now another one issue is blocking me from getting a solution.

The ANSYS file is running on SSD with 980gb space available and my laptop has 32gb RAM, but during the solution it crashes reporting error for not enough memory available for out-of-core solving.
It says that 31gb of space are available and the solution requires 41gb, but shouldn't out-of-core solver swap on disk to get the amount of extra space needed for solution when RAM is not enough?

On the university workstation it works like this, but now on my laptop it crashes even if there is plenty of space (900gb!!) available on the SSD.

Could somebody please explain why?
DenEnc is offline   Reply With Quote

Old   March 19, 2018, 16:14
Default
  #6
New Member
 
Join Date: Mar 2018
Posts: 9
Rep Power: 4
DenEnc is on a distinguished road
I'm quoting the error message I get each time, I also tried to increase both workspace and database memory size but nothing changed.


*** ERROR *** CP = 372.266 TIME= 21:11:15
There is not enough memory for the Distributed Sparse Matrix Solver to
proceed using the out-of-core memory mode. The total memory required
by all processes = 40186 MB. The total physical memory that is
available on the system = 31079 MB. Please decrease the model size,
or run this model on another system with more physical memory.
DenEnc is offline   Reply With Quote

Old   March 19, 2018, 17:44
Default
  #7
Senior Member
 
flotus1's Avatar
 
Alex
Join Date: Jun 2012
Location: Germany
Posts: 2,578
Rep Power: 35
flotus1 will become famous soon enoughflotus1 will become famous soon enough
I am no expert, but that sounds pretty straightforward: even for out-of-core execution, you need a certain amount of physical RAM. How much RAM does the workstation at your university have?
__________________
Please do not send me CFD-related questions via PM
flotus1 is offline   Reply With Quote

Old   March 19, 2018, 17:49
Default
  #8
New Member
 
Join Date: Mar 2018
Posts: 9
Rep Power: 4
DenEnc is on a distinguished road
64gb.. if it's as you say that's really bad, don't have enough money right now for other 32gb of RAM
DenEnc is offline   Reply With Quote

Old   March 20, 2018, 13:10
Default
  #9
Senior Member
 
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 981
Rep Power: 18
evcelica is on a distinguished road
Change the solver type from "Program controlled" to PCG, or Iterative.
The Direct solver that the program is choosing uses a lot more RAM than the iterative solver.
It is in the tree on the left, under:
ANALYSIS SETTINGS
SOLVER CONTROLS
SOLVER TYPE
ITERATIVE

You could also try to increase the size of your paging file, but I don't think that is your problem now.
evcelica is offline   Reply With Quote

Reply

Tags
ansys, hardware specification, hdd, ssd, workbech

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
Workbench 18.2 Installation Error Ubuntu 16.04 turbostudent ANSYS 1 October 3, 2019 11:13
ANSYS Optimization failing to update Results component. harmollo1 ANSYS 1 March 21, 2019 16:30
Ansys Workbench Fracture and Cracking Behavior using Solid65 jackhero Structural Mechanics 0 December 25, 2017 01:45
Can you help me with a problem in ansys static structural solver? sourabh.porwal Structural Mechanics 0 March 27, 2016 18:07
Gambit vs. Ansys workbench mesh generating sanlee39 Main CFD Forum 2 April 8, 2013 07:09


All times are GMT -4. The time now is 15:32.