ROCm on APUs

[Cordell Bloor <cgmb@slerp.xyz>]

Hello,

The ROCm packages for Debian are built such that they can run on AMD 
APUs, however, there is a major limitation. Integrated GPUs are often 
configured with a relatively small amount of initial memory dedicated to 
the GPU. The APU expects that the memory reserved for the GPU will be 
adjusted dynamically. Unfortunately, HIP applications will not 
automatically request more memory to be assigned to the GPU and are 
therefore stuck with the default allocation.

Carlos Segura has an interesting workaround [1]. Using LD_PRELOAD, they 
replace hipMalloc / hipFree with hipHostMalloc / hipHostFree to force 
all device memory allocations to use pinned host memory instead.

Sincerely,
Cory Bloor

[1]: https://github.com/segurac/force-host-alloction-APU