Number of Cores in ANSYS Mechanical

Safasml · May 19, 2020, 09:34

Hi,
Can anyone tell me how to increase the number of cores used in ANSYS Mechanical? As I understood when the number of cores exceeds 4, an error appears and the solution stops.
I want to use 8 cores in my analysis. What should I do?

siw · May 20, 2020, 04:10

If you are using an older version of Mechanical (2019 R1 and before) click on Tools / Solve Process Settings / Advanced and enter the amount of CPUs and GPUs you want to use.

If you are using a newer version of Mechanical (2019 R2 and after) which has the new GUI with the ribbon layout then cores are set in the Home tab. If you click on the lower right-hand corner of the Solve area it opens the Solve Process Settings box as in the older ANSYS versions.

Safasml · May 20, 2020, 07:12

Dear siw, thank you for your quick response. I am using ANSYS 2019 R1 and as I said when I increase the number of cores (more than 4 cores) I encounter an error and the solution stops. Any idea?

siw · May 20, 2020, 07:53

Do you have the correct licences for running on more cores? Are you using a Student or Commercial licence? Post a screen print of the Mechanical error.

Safasml · May 20, 2020, 10:03

I think I realized where the problem is… my PC has 4 cores and 8 logical processors. I thought that ANSYS Mechanical is as same as Fluent and CFX and I can set the number of cores equal to the logical processors but probably it’s not true… am I right?
I am using Student license. And you said about the correct licenses… I didn’t understand what you mean.

siw · May 21, 2020, 02:32

The ANSYS Student website (https://www.ansys.com/en-gb/academic...udent-products) System Requirements and Browser drop down menu says "Support for up to 2 cores for HPC solutions". So that was why I asked what you were using. I only use the Student version to try features on my personal laptop (so I do not need run a job on more than 2 cores). It is only when I use ANSYS at work on our commercial licences I can use many cores as we have some HPC Packs.

user628 · February 22, 2024, 11:03

Quote:

Originally Posted by siw

The ANSYS Student website (https://www.ansys.com/en-gb/academic...udent-products) System Requirements and Browser drop down menu says "Support for up to 2 cores for HPC solutions". So that was why I asked what you were using. I only use the Student version to try features on my personal laptop (so I do not need run a job on more than 2 cores). It is only when I use ANSYS at work on our commercial licences I can use many cores as we have some HPC Packs.

Where can I find in Ansys how much cores licence has?

Farkin · March 6, 2024, 10:37

I've encountered issues with exceeding the allowed number of cores, so the information here is particularly useful to me. Understanding the difference between physical cores and logical processors, as well as potential license restrictions, is crucial to ensure proper configuration and avoid mistakes.

https://spacemanoyunu.net/

evcelica · April 4, 2024, 12:05

You Stated: "my PC has 4 cores and 8 logical processors"
So you should only solve on those physical cores, not logical cores, which can introduce problems and often times slow performance. It would probably be best to go into the BIOS and disable hyperthreading (or "SMT" for AMD CPUS) so that the machine only ever uses 4 physical cores without hyperthreading.

May 19, 2020, 09:34	Number of Cores in ANSYS Mechanical	#1
Safasml Member Join Date: Oct 2017 Posts: 35 Rep Power: 8	Hi, Can anyone tell me how to increase the number of cores used in ANSYS Mechanical? As I understood when the number of cores exceeds 4, an error appears and the solution stops. I want to use 8 cores in my analysis. What should I do?

May 21, 2020, 02:32		#6
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 733 Rep Power: 25	The ANSYS Student website (https://www.ansys.com/en-gb/academic...udent-products) System Requirements and Browser drop down menu says "Support for up to 2 cores for HPC solutions". So that was why I asked what you were using. I only use the Student version to try features on my personal laptop (so I do not need run a job on more than 2 cores). It is only when I use ANSYS at work on our commercial licences I can use many cores as we have some HPC Packs. Safasml likes this.

March 6, 2024, 10:37		#8
Farkin New Member Join Date: Mar 2024 Posts: 3 Rep Power: 2	I've encountered issues with exceeding the allowed number of cores, so the information here is particularly useful to me. Understanding the difference between physical cores and logical processors, as well as potential license restrictions, is crucial to ensure proper configuration and avoid mistakes. https://spacemanoyunu.net/ Last edited by Farkin; March 7, 2024 at 04:27.

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May 20, 2020, 04:10		#2
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 733 Rep Power: 25	If you are using an older version of Mechanical (2019 R1 and before) click on Tools / Solve Process Settings / Advanced and enter the amount of CPUs and GPUs you want to use. If you are using a newer version of Mechanical (2019 R2 and after) which has the new GUI with the ribbon layout then cores are set in the Home tab. If you click on the lower right-hand corner of the Solve area it opens the Solve Process Settings box as in the older ANSYS versions.

May 20, 2020, 07:12		#3
Safasml Member Join Date: Oct 2017 Posts: 35 Rep Power: 8	Dear siw, thank you for your quick response. I am using ANSYS 2019 R1 and as I said when I increase the number of cores (more than 4 cores) I encounter an error and the solution stops. Any idea?

May 20, 2020, 07:53		#4
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 733 Rep Power: 25	Do you have the correct licences for running on more cores? Are you using a Student or Commercial licence? Post a screen print of the Mechanical error.

May 20, 2020, 10:03		#5
Safasml Member Join Date: Oct 2017 Posts: 35 Rep Power: 8	I think I realized where the problem is… my PC has 4 cores and 8 logical processors. I thought that ANSYS Mechanical is as same as Fluent and CFX and I can set the number of cores equal to the logical processors but probably it’s not true… am I right? I am using Student license. And you said about the correct licenses… I didn’t understand what you mean.

April 4, 2024, 12:05		#9
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	You Stated: "my PC has 4 cores and 8 logical processors" So you should only solve on those physical cores, not logical cores, which can introduce problems and often times slow performance. It would probably be best to go into the BIOS and disable hyperthreading (or "SMT" for AMD CPUS) so that the machine only ever uses 4 physical cores without hyperthreading.