vLLM weight save/load and (mostly) end to end. (Don't merge) - #11
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samsja
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Nov 11, 2025
* math only and nccl * add code and seq * up temp * 20 ckpt step --------- Co-authored-by: Mika Senghaas <mail@mikasenghaas.de>
samsja
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Dec 4, 2025
* math only and nccl * add code and seq * up temp * 20 ckpt step --------- Co-authored-by: Mika Senghaas <mail@mikasenghaas.de>
This was referenced May 8, 2026
snimu
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May 20, 2026
Updates after read-only inspection of the cluster: - TTT plan + cheat-sheet now carry the actual cluster facts: H200 topology, /beegfs storage, vLLM 0.21.0 pin, weight broadcast=nccl, Qwen3-4B model cache, production memory pressure (optim_cpu_offload). - gate_up_proj layerwise fix is already in main (PR #2482); historical failure mode noted but no longer needs reproduction. Live SFT-on-tool runs validate the SFT path behaviorally — smoke task #1 is implicit. - New hard invariant from daniel/gptoss-lora-nan-repro HANDOVER: every chunk snapshot gets a fresh lora_int_id, never reused. LRU eviction handles cleanup. Codified in the cheat-sheet's "things that burned us" and as plan invariant #11. - Multi-LoRA infra is production-hardened via hosted training; TTT risk surface narrowed to the chunked-snapshot churn pattern, not the multi-LoRA machinery itself. New files: - docs/ttt-probes.md: four single-purpose benchmarks the cluster session should run before writing Phase A code — snapshot churn, learner forward+backward, multi-LoRA forward overhead at n_adapters ∈ {1,8,64,256,1024}, /beegfs write throughput. Each has pass criteria that gate later phases. - docs/ttt-config-draft.toml: starter TOML mirroring the production Forth qwen-rl.toml shape, with the TTT additions on top. Drops as `qwen-rl-ttt.toml` next to qwen-rl.toml in configs/private when the cluster session moves it over.
snimu
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May 22, 2026
Updates after read-only inspection of the cluster: - TTT plan + cheat-sheet now carry the actual cluster facts: H200 topology, /beegfs storage, vLLM 0.21.0 pin, weight broadcast=nccl, Qwen3-4B model cache, production memory pressure (optim_cpu_offload). - gate_up_proj layerwise fix is already in main (PR #2482); historical failure mode noted but no longer needs reproduction. Live SFT-on-tool runs validate the SFT path behaviorally — smoke task #1 is implicit. - New hard invariant from daniel/gptoss-lora-nan-repro HANDOVER: every chunk snapshot gets a fresh lora_int_id, never reused. LRU eviction handles cleanup. Codified in the cheat-sheet's "things that burned us" and as plan invariant #11. - Multi-LoRA infra is production-hardened via hosted training; TTT risk surface narrowed to the chunked-snapshot churn pattern, not the multi-LoRA machinery itself. New files: - docs/ttt-probes.md: four single-purpose benchmarks the cluster session should run before writing Phase A code — snapshot churn, learner forward+backward, multi-LoRA forward overhead at n_adapters ∈ {1,8,64,256,1024}, /beegfs write throughput. Each has pass criteria that gate later phases. - docs/ttt-config-draft.toml: starter TOML mirroring the production Forth qwen-rl.toml shape, with the TTT additions on top. Drops as `qwen-rl-ttt.toml` next to qwen-rl.toml in configs/private when the cluster session moves it over.
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