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I get this warning in Batch model EDEM: "WARNING : Deprecated Solver : The OpenCL solver has been deprecated in EDEM 2022.2 and will be removed"

Mahdi_22303

Hi,

I am using GPU for a batch mode processing of the EDEM simulation on HPC with Linux system. When I am using the GUI, I can see that both CUDA and OpenCL are in the options for GPU, and I can select CUDA. First, I am using EDEM 2022.3, so is it using CUDA? if it is still using OpenCL, does it affect the speed of simulations using GPU? if so, is there any syntax I can use to ask EDEM to use CUDA. I am using this syntax

edem -c -i EDEM_project.dem -r 25 -E 1 --rewind

Thank you,

Mahdi.

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Accepted answers

Stephen Cole

And when I use this syntax

edem -c -i EDEM_project.dem -r 25 -E 2 --rewind

I get this error message

ERROR : Multi-Sphere GPU CUDA Solver : No GPU device is set.
You can perform GPU device testing in Options -> Simulator Engine -> Start test

How can I avoid this testing stage without needing to open the EDEM in GUI mode?

Thank you,

Mahdi.

Hi Mahdi,

You can add in -D flag for device.

edem -c -i EDEM_project.dem -r 25 -E 2 -D 0 --rewind

This will run on CUDA using 1 GPU and the first GPU device in the list. If you have 4 GPU's they would be device 0, 1, 2 or 3 and you could specify -D 1 or -D 3 etc. if you just wanted to run 1.

If you want to run on 2 GPU's you can use:

edem -c -i EDEM_project.dem -r 25 -E 2 -D 0+1 --rewind

Or -D 1+2, -D 0+3 etc. And for 4 GPU's it would be -D 0+1+2+3

Regards

Stephen

All comments

Stephen Cole

Hi Mahdi,

You can change flag -E 1 to -E 2. Engine 1 is the OpenCL solver and Engine 2 is the CUDA solver.

How to use EDEM Batch Commands

Regards

Stephen

Mahdi_22303

Hi Mahdi,

You can change flag -E 1 to -E 2. Engine 1 is the OpenCL solver and Engine 2 is the CUDA solver.

How to use EDEM Batch Commands

Regards

Stephen

Hi Stephen,

Thank you for your reply. I thought " E 2" in the batch command means using 2 GPUs. If 2 refers to CUDA, then how can we specify number of GPUs to be used. I am requesting in the bash file the number of GPUS using

#SBATCH --gpus=a100:2 # Request 2 full a100 GPUs for job

so, then when I am using this command:

edem -c -i EDEM_project.dem -r 25 -E 2 --rewind

does this mean that EDEM will use both of GPUs?

Thank you.

Mahdi_22303

And when I use this syntax

edem -c -i EDEM_project.dem -r 25 -E 2 --rewind

I get this error message

ERROR : Multi-Sphere GPU CUDA Solver : No GPU device is set.
You can perform GPU device testing in Options -> Simulator Engine -> Start test

How can I avoid this testing stage without needing to open the EDEM in GUI mode?

Thank you,

Mahdi.

Stephen Cole

And when I use this syntax

edem -c -i EDEM_project.dem -r 25 -E 2 --rewind

I get this error message

ERROR : Multi-Sphere GPU CUDA Solver : No GPU device is set.
You can perform GPU device testing in Options -> Simulator Engine -> Start test

How can I avoid this testing stage without needing to open the EDEM in GUI mode?

Thank you,

Mahdi.

Hi Mahdi,

You can add in -D flag for device.

edem -c -i EDEM_project.dem -r 25 -E 2 -D 0 --rewind

This will run on CUDA using 1 GPU and the first GPU device in the list. If you have 4 GPU's they would be device 0, 1, 2 or 3 and you could specify -D 1 or -D 3 etc. if you just wanted to run 1.

If you want to run on 2 GPU's you can use:

edem -c -i EDEM_project.dem -r 25 -E 2 -D 0+1 --rewind

Or -D 1+2, -D 0+3 etc. And for 4 GPU's it would be -D 0+1+2+3

Regards

Stephen

Mahdi_22303

Hi Mahdi,

You can add in -D flag for device.

edem -c -i EDEM_project.dem -r 25 -E 2 -D 0 --rewind

This will run on CUDA using 1 GPU and the first GPU device in the list. If you have 4 GPU's they would be device 0, 1, 2 or 3 and you could specify -D 1 or -D 3 etc. if you just wanted to run 1.

If you want to run on 2 GPU's you can use:

edem -c -i EDEM_project.dem -r 25 -E 2 -D 0+1 --rewind

Or -D 1+2, -D 0+3 etc. And for 4 GPU's it would be -D 0+1+2+3

Regards

Stephen

Thank you so much Stephen, it worked.