Tech Discussion: Why Doesn't llama.cpp Implement GTT Offloading?
pneuny · reddit · 2026-08-20
A Reddit user asked why llama.cpp doesn't implement GTT (GPU-to-System RAM) offloading. The argument is that layers like mmproj, used only during prompt processing with parallel compute, might be bottlenecked by compute rather than memory bandwidth. Even if system RAM bandwidth is 1/10th of GPU VRAM, offloading these layers could theoretically free up VRAM without slowing down the workflow, unlike CPU offloading which is computationally limited.
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