Nested loops in CUDA

OpenACC and CUDA Fortran
Posts: 6
Joined: Feb 23 2015

Post by esemgn » Wed Dec 13, 2017 7:54 am

Hi Mat,
mkcolg wrote:
What is the reason for such a small acceleration?
Is it possible to achieve a much higher acceleration?
Without a reproducing example, I can't really say.
I made the reproducing example, but I have problems to post it here. Maybe is it too long? How can I do it?

Can I make it per email?

Best regards,

Posts: 8066
Joined: Jun 30 2004

Post by mkcolg » Wed Dec 13, 2017 9:02 am

Thanks Elena. Please send the example source to PGI Customer Service ( and ask them to forward it to me.


Posts: 3
Joined: Jun 20 2019

Re: Nested loops in CUDA

Post by dkokron » Thu Jul 11, 2019 3:55 pm


What was the eventual resolution to this ticket? Did Elena get her speedup?


Posts: 8066
Joined: Jun 30 2004

Re: Nested loops in CUDA

Post by mkcolg » Fri Jul 12, 2019 7:48 am

Hi Dan,
Did Elena get her speedup?
I'm not sure. I looked through my old email from December 2017 and don't see that Elena sent in any code. The only email I have from her is from 2015. I could have not saved it, but I typically save all emails from users. Granted, the Customer Support folks could have helped her directly instead of forwarding her note to me.

Do you have a similar issue?


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