[recipe] add Agentic-K3 recipe - #1941
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Heavy model tests:
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con8 ran with neither tier: 32 seqs, 96 checkpoint slots, all of it in
HBM. Moving it onto the same LMCache + state-offload pair con10 uses --
16 seqs, 16 slots, 32 GiB/rank of CPU KV -- measures faster, so that is
what the profile should say. ReplaySSM stays on and the batched-token
budget stays at 8192, which is where con8 still differs from con10.
Three defaults the shared blocks got wrong for anyone who enables them
outside a named profile, all found the hard way:
- LMCACHE_MAX_LOCAL_CPU_SIZE fell back to 200 GiB. Each rank allocates
its own, and 200 hangs the launch mid-pin (seen at rank 2). 32.
- OFFLOAD_GPU_STAGING_CHUNKS was set but unexplained. The default is
2 chunks (8 MiB), one K3 state entry is 54.78 MiB, and a buffer that
cannot hold one entry makes the tier decline to build -- one log
line, then nothing offloads, which reads exactly like a tier that is
on and idle.
- OFFLOAD_SAVE_PER_REQ_CACHE has no line here and should not get one.
A sequence owning per-request state has its KV load leg refused, so
saving that KV costs ~8% throughput for bytes nothing reads back.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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