ComfyUI hogs all VRAM: --reserve-vram broken, undocumented --vram-headroom no help
Radiant-Photograph46 · reddit · 2026-09-05
A user reports ComfyUI fills VRAM to the absolute limit, conflicting with the browser and blocking generation unless the window is minimized. Their findings on limiting VRAM:
- --disable-pinned-memory doesn't prevent the behavior
- --reserve-vram (meant to reserve X GB for the OS) no longer works since dynamic VRAM management was introduced
- New --vram-headroom flag exists but is undocumented and shows no visible difference from --reserve-vram
The post is a help request but highlights ComfyUI's outdated docs and the lack of a user-controllable VRAM cap.
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