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spec: Add benchmark-only synthetic speculative acceptance options (#27711)

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* Add benchmark-only synthetic speculative acceptance to llama-server and llama-cli

* Address review comments

* Address review comments

* Add some comments in the code
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Gaurav Garg
2026-08-27 13:53:42 +03:00
committed by GitHub
parent deae5ee133
commit 2bb9bddafa
11 changed files with 427 additions and 17 deletions
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tools/server/README.md
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@@ -259,6 +259,8 @@ For the full list of features, please refer to [server's changelog](https://gith
| `--spec-draft-n-cpu-moe, --spec-draft-ncmoe, -ncmoed, --n-cpu-moe-draft N` | keep the Mixture of Experts (MoE) weights of the first N layers in the CPU for the draft model<br/>(env: LLAMA_ARG_SPEC_DRAFT_N_CPU_MOE) |
| `--spec-draft-n-max N` | number of tokens to draft for speculative decoding (default: 3)<br/>(env: LLAMA_ARG_SPEC_DRAFT_N_MAX) |
| `--spec-draft-n-min N` | minimum number of draft tokens to use for speculative decoding (default: 0)<br/>(env: LLAMA_ARG_SPEC_DRAFT_N_MIN) |
| `--spec-synth-len L` | target mean synthetic acceptance length, including the target token (benchmarking only)<br/>(env: LLAMA_ARG_SPEC_SYNTH_LEN) |
| `--spec-synth-rates P0,P1,...` | comma-separated unconditional per-position synthetic acceptance probabilities (benchmarking only)<br/>(env: LLAMA_ARG_SPEC_SYNTH_RATES) |
| `--spec-draft-p-split, --draft-p-split P` | speculative decoding split probability (default: 0.10)<br/>(env: LLAMA_ARG_SPEC_DRAFT_P_SPLIT) |
| `--spec-draft-p-min, --draft-p-min P` | minimum speculative decoding probability (greedy) (default: 0.00)<br/>(env: LLAMA_ARG_SPEC_DRAFT_P_MIN) |
| `--spec-draft-backend-sampling, --no-spec-draft-backend-sampling` | offload draft sampling to the backend (default: enabled)<br/>(env: LLAMA_ARG_SPEC_DRAFT_BACKEND_SAMPLING) |