What data is saved in Single (Double) precision in Hybrid precision setting?
Hello.
I would like to know the specifications of Hybrid precision setting in order to appropriately select the precision of the CUDA solver.
What data is saved in Single (or Double) Precision in Hybrid Precision setting?
Best regards,
Oshiro
Hello, Stephen.
Thank you for your response.
What I would like to know is which physical quantities are stored in single precision or double precision in the context of hybrid precision.
I apologize for the lack of clarity in my question, which may have caused confusion.
Best regards,
Oshiro
Altair EmployeeHello, Stephen.
Thank you for your response.
What I would like to know is which physical quantities are stored in single precision or double precision in the context of hybrid precision.
I apologize for the lack of clarity in my question, which may have caused confusion.
Best regards,
Oshiro
Hi Oshiro,
To clarify by stored were you looking for the size in Mb of data stored, or the calculation accuracy?
In terms of the calculation we don't have a set list however it should follow what we see in the API.
Absolute values like Positions are typically calculated/stored as Double precision when using the Mixed precision solver. All other variables would be Single Precision. Positions include Center of Mass, particle position, geometry node position, Field Data position, Contact Point. Other variables calculated as doubles include the current Simulation Time.
Regards
Stephen
Hi Oshiro,
To clarify by stored were you looking for the size in Mb of data stored, or the calculation accuracy?
In terms of the calculation we don't have a set list however it should follow what we see in the API.
Absolute values like Positions are typically calculated/stored as Double precision when using the Mixed precision solver. All other variables would be Single Precision. Positions include Center of Mass, particle position, geometry node position, Field Data position, Contact Point. Other variables calculated as doubles include the current Simulation Time.
RegardsStephen
Hello, Stephen.
What I wanted to know was about the calculation accuracy.
The information you provided is the answer I was looking for.
Thank you very much.
Best Regards,
Oshiro
Hi,
The precision modes save the same data, it's the accuracy of the calculation which is changed.
This is outlined further here:
EDEM Particle Simulation: CUDA GPU and Precision Modes
Which also gives links to our e-learning lesson on the GPU.
Regards
Stephen