[Development] Using DMA instead of SHM in non OpenGL apps (Linux/Wayland)

[Giuseppe D'Angelo]

On 24/08/2023 21:37, Eduardo Hopperdietzel wrote:
> The results show that there's no significant difference in the time it 
> takes for read and write operations using QPainter in SHM and DMA maps.

I'm really curious here, and these aren't rhetorical questions: why 
would anyone expect to be a difference in performance, as far as 
QPainter is concerned? Isn't it ultimately just using a CPU-based 
renderer onto a block of memory? Why should it make a difference where 
that memory comes from / how it's managed / etc.? Are we're talking 
about "far memory" (NUMA-like) scenarios?

Thank you,
-- 
Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - The Qt, C++ and OpenGL Experts

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