BiCGStab is slower on R2021a using GPUs

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deniz on 1 Jul 2021
Commented: Joss Knight on 29 Sep 2021
I have both matlab R2020a and R2021a. I have been using rtx 3090 GPU to do my calculations
I noticed preconditioned BiCGStab algorithm on R2020a is 3 times faster than the R2021a version using the GPU.
That doesn't make sense because R2020a has forward compatibility for my GPU where R2021a has native support for the ampere GPUs
If I'm missing something what could it be?

Answers (1)

Joss Knight
Joss Knight on 1 Jul 2021
There is a MATLAB bug report on this known issue:
You should make sure you are using the latest Update for R2021a.
Joss Knight
Joss Knight on 29 Sep 2021
The MATLAB bug report to track for this particular issue is:
The problem is proving difficult to work around due to changes in the underlying NVIDIA libraries, for which we apologise. We have to upgrade these libraries to support the latest hardware.
If you can manage without using a preconditioner then you can avoid the problem.

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