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Could it be the gpu driver/framework? I thought DX12 and Vulkun were meant to be cpu optimised and be able to use heaps of cores.


I guess, but like... how? Like I said, I can't really think of 24 things to do lol. I'm reminded of Dolphin, the GC/Wii emulator - people would ask for more cores to be used and they'd basically be like "for what???", they started moving stuff like audio out, eventually they made some breakthroughs where they could split more things out.

Maybe with these frameworks threads are less dedicated and instead are more cooperative, idk. Really not my area!


https://m.youtube.com/watch?v=MWyV0kIp5n4 I'm reminded of this poe build that can crash the server with too many spell effects


Or simply put, there's too much going on. I remember they had to rewrite ASAP some parts of the engine right after the release of Blight due to FPS drops down to 1/inf at the end-endgame versions of the encounter, as well as server crashes.


Sort of funny story, the concept of this build (spell loop) is currently meta, sadly the servers have improved to the point that they don‘t crash anymore.


Maybe all it does is produce crazy high, pointless FPS.


I've seen the NVIDIA driver eat up all the CPU on multiple cores without really doing anything substantial to the framerate.

This was back in the Windows XP days when I was working on OpenGL and DirectX. It would do this while rendering like a couple of triangles. One core I could understand, but not all. I'm pretty sure the driver had some spinlocks in there.

I also managed to find out the NVIDIA driver assumed user buffers passed to OpenGL (VBOs) would be 16-byte aligned, using aligned SIMD operations on them directly, even though there's no mention of alignment in the OpenGL spec.

It just so happened that Microsoft's C++ runtime would do 16-byte aligned allocations, while the language I was using only did 4-byte.

All is fair in love and performance wars I suppose...




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