December 4, 2019 at 7:30 amMichaelphungSubscriber
Hi all, I'm doing project about using CFD to analysis the wind flow on a high-rise building.
I set up the running with a computer configuration (I7 - 9700k, 48Gb ram ddr4, RTX 2070 MSI); and using ANSYS FLUENT 2019R3 (license from my University).
I need to ask how can I run parallely my CPU and GPU to optimize my computational time.
That computer desktop configuration was already set up, show, I cannot change any items of them.
I checked a video here https://www.youtube.com/watch?v=9YH9p2KbRls; but not sure about my GPU was used or did it run with maximum performance.
Pls help me and I'm pleasure too discuss about wind analysis too. Thank you so much.
My email here: email@example.com
December 4, 2019 at 9:25 amDrAmineAnsys Employee
Verify by the messages written in the console. The video is quite helpful. You need to care about:
Homogeneous process distribution
Homogeneous GPU selection
Number of processes be an exact multiple of number of GPUs
That is the supported hardware configuration
Example: CPU node has 16 cores with 2 GPU's.
If your run spent more than 70% of the time in AMG then GPU will help: if not you won'T see any profit (LE wall clock time per iteration from parallel statistiscs must be larger than 70% or more)
December 6, 2019 at 3:09 am
December 6, 2019 at 6:11 pmDrAmineAnsys EmployeeRun with GPU first and check if LE ckock time per iteration is more than 80% so that GPU usage might bring speedup
December 7, 2019 at 4:54 amMichaelphungSubscriber
This one I already enable the GPU for pressure equation - following the instruction in the video!
Did you mean WITHOUT GPU?
December 7, 2019 at 5:02 amMichaelphungSubscriber
one more thing, I run this model using LES by SIMPLE scheme;
I read some discussion on CFD online forum about GPU is deactivated when using SIMPLE.
is that true?
December 7, 2019 at 6:50 amDrAmineAnsys EmployeeYes without first to check if it's worthy using GPU.
Yes it does only provide benefits for coupled solver. All this is documented.
December 7, 2019 at 6:53 amMichaelphungSubscriber
oh no! with a large number of elements, If I use the coupled solve, it will be over memory and close immediately.
Maybe, it will be not expected in GPU anymore
December 7, 2019 at 6:56 amDrAmineAnsys EmployeeYes.
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