Forums - GPU frequency != clocks per second

3 posts / 0 new
Last post
GPU frequency != clocks per second
chena.invalid
Join Date: 25 May 14
Posts: 3
Posted: Fri, 2021-04-16 04:18

Snapdragon profiler version v2020.3.0.9242020, win7 64, and cpu is snapdragon 865, gpu is Adreno 650.

GPU Frequency is 490M, clocks / second is 100M -  151M

What is the meaning of clocks per second ?

And when i use snapshot, i close the frequency auto adjust, and frequency change from 305M to 490M, but the gpu use more clocks to render a pass.

use that setting to close frequency auto adjust.

305M  clocks 924460

490M clocks 956468

this is not a random measuring error, i measure many times, every time the clocks is more when gpu frenquency is 490M.

Why?

  • Up0
  • Down0
chena.invalid
Join Date: 25 May 14
Posts: 3
Posted: Fri, 2021-04-16 04:41

Why the pictures  i pasted in the post can't display?

  • Up0
  • Down0
eshaw Moderator
Join Date: 12 May 16
Location: San Diego
Posts: 124
Posted: Fri, 2021-04-16 17:19

'GPU Frequency' is the frequency that has been set by the dynamic frequency system. 'Clocks/second` is the average number of clocks that were actually executed per second by the GPU. The two values can differ for numerous reasons, including latency between the request and the adjustment by the GPU, the lower update rate of the `GPU Frequency` metric, and numerous additional power saving technologies that allow the GPU to stop running when there is no work to do, independently of the specified frequency level.

Eric

  • Up0
  • Down0
or Register

Opinions expressed in the content posted here are the personal opinions of the original authors, and do not necessarily reflect those of Qualcomm Incorporated or its subsidiaries (“Qualcomm”). The content is provided for informational purposes only and is not meant to be an endorsement or representation by Qualcomm or any other party. This site may also provide links or references to non-Qualcomm sites and resources. Qualcomm makes no representations, warranties, or other commitments whatsoever about any non-Qualcomm sites or third-party resources that may be referenced, accessible from, or linked to this site.