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Pipeline parallelism in llama.cpp may be wasting your VRAM

Via r/LocalLlama
Monday, Jun 8, 2026 · 11:58PM
Summary

By default, llama.cpp enables pipeline parallelism, presumably to speed up inference. In my testing, I found that pipeline parallelism has no speed benefit and comes at a significant cost of VRAM. This cost can be avoided by compiling llama.cpp with the -DGGML_SCHED_MAX_COPIES=1 option. This prevent

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