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- USM turns idle NVIDIA VRAM into Linux swap
USM is a beta, NVIDIA-only Linux project that uses a user-space daemon to borrow idle VRAM through CUDA and expose it as a high-priority swap device through ublk, without requiring a kernel module. Developer kha333n reports that 5.5 GiB of VRAM with lz4 compression held about 16 GiB of application memory and averaged roughly 9 microseconds per page fault, versus about 55 microseconds plus overhead for NVMe. The project was tested on Ubuntu 26.04 with two laptops, and most of its code was written with Claude Code.
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