mooncake: read preferred_segment from environment#37
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ivanium merged 4 commits intoMay 12, 2026
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Today the only way to route owner-client puts to the local Mooncake
segment is to set MOONCAKE_PREFERRED_SEGMENT or extra_config.preferred_segment
manually. Both require an external wrapper to know the right host:port,
which makes the optimization invisible to vanilla vLLM users and unsafe in
multi-NIC environments where the wrapper guesses the wrong IP.
Add a best-effort auto-detection path:
1. Enumerate every non-loopback local IPv4 via psutil.net_if_addrs() so
multi-NIC hosts work without manual config.
2. GET the master /metrics endpoint (URL is read from
extra_config.master_metrics_url or the MOONCAKE_MASTER_METRICS_URL env
var) and parse `segment_total_capacity_bytes{segment="host:port"}`.
3. If a segment's host matches any local IP, return it as the preferred
segment. Otherwise return None and fall back to the random allocator.
Existing override paths are unchanged: an explicit
extra_config["preferred_segment"] still takes precedence. If neither the
override nor a metrics URL is configured the function returns None
exactly as before, so this is purely additive for current deployments.
Why this matters:
- Owner-client deployments get the put-locality benefit without shipping
a wrapper that exports MOONCAKE_PREFERRED_SEGMENT.
- Other Mooncake topologies (shared owner / no owner) opt in by setting
master_metrics_url.
- Failures (no psutil, master unreachable, no segment match) all degrade
to "no preference", so the feature can never break startup.
Measured benefit (Kimi-K2.5-NVFP4 reference workload, GB200 NVL72,
preferred_segment ON vs OFF, single-variable ablation):
P:D TTFT regression OFF -> ON
1p1d +5.7%
3p1d +10.2%
The TTFT gain comes from RDMA-path locality (puts land on the local
segment so reads stay intra-host); ext_hit barely moves between the two
runs, confirming the win is not a hit-rate effect.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Code Review
This pull request implements an auto-detection mechanism for the preferred Mooncake segment by matching local IPv4 addresses against segments listed in master metrics. It introduces utility functions to enumerate local non-loopback IPv4 addresses and fetch/parse Prometheus metrics. Feedback was provided regarding the regular expression used for parsing metrics, which was identified as being too restrictive for real-world Prometheus outputs that may contain multiple labels in varying orders.
Comment on lines
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| _SEGMENT_METRIC_RE = re.compile( | ||
| r'^segment_total_capacity_bytes\{segment="([^"]+)"\}\s+', re.MULTILINE | ||
| ) |
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The regular expression for parsing Prometheus metrics is too restrictive. It assumes that segment is the only label and that there are no spaces within the braces. Prometheus does not guarantee label order, and other labels (such as instance, job, or cluster) are frequently present in real-world deployments. If other labels exist, this auto-detection will silently fail and fall back to the random allocator, negating the performance benefits of this PR.
Updating the regex to allow for other labels before or after the segment label makes the auto-detection much more robust.
Suggested change
| _SEGMENT_METRIC_RE = re.compile( | |
| r'^segment_total_capacity_bytes\{segment="([^"]+)"\}\s+', re.MULTILINE | |
| ) | |
| _SEGMENT_METRIC_RE = re.compile( | |
| r'^segment_total_capacity_bytes\{[^}]*segment="([^"]+)"[^}]*\}\s+', re.MULTILINE | |
| ) |
Use MOONCAKE_PREFERRED_SEGMENT as a launcher-provided owner segment hint instead of scraping master metrics. Explicit extra_config.preferred_segment keeps priority over the environment fallback. Co-authored-by: OpenAI Codex <codex@openai.com>
Set MOONCAKE_PREFERRED_SEGMENT from the managed owner host and segment port so MooncakeStore workers can prefer the node-local owner segment. Co-authored-by: OpenAI Codex <codex@openai.com>
Let the owner wrapper skip default kv-transfer-config injection when the wrapped vLLM command already supplies one, so PD MultiConnector recipes can still use the managed owner path. Co-authored-by: OpenAI Codex <codex@openai.com>
ivanium
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May 12, 2026
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zhewenl
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…og + perf fixes Squashed forward-port of feat/mooncake-store-int-owner-client + PR-32 (tier-log) + PR-31 (segment readiness probe) + PR-36 (enable_offload gate + count-trigger removal) + PR-37 (preferred_segment env) + bind_gpu_block_pool MultiConnector fix, on top of the rebased feat/mooncake-store-connector. What lands ========== Owner-client topology - scripts/mooncake/: master + owner launcher + RDMA auto-detection helpers - mndp.yaml: Kimi-K2.5-NVFP4 / Qwen3-8B DP=4 vigil recipe - vllm/distributed/.../mooncake/rdma_utils.py: RNIC + GID detection - requester-only setup refactor: vLLM ranks pass global_segment_size=0; the separate mooncake_client owner contributes the CPU pool + SSD tier Disk offload (re-introduced after intentional revert on PR-40900) - batch budget tracking with backpressure - batch-splitting for disk-tier loads - LookupKeyServer wiring (restored after cherry-pick drop) - store_py.cpp + standalone-binary fixes are companion in kvcache-ai#2083 PR-32 observability - VLLM_MOONCAKE_STORE_TIER_LOG=1: per-batch "Mooncake load tier summary" lines showing memory_keys/disk_keys/unknown_keys/success_keys/failed_keys and bytes_by_tier breakdown PR-36 perf - _get_disk_offload_buffer_budget_bytes(enable_offload) returns None when off - enable_offload field on MooncakeStoreConfig (read from JSON or MOONCAKE_ENABLE_OFFLOAD env) - dropped redundant count-based split trigger that was firing on every batch with ≥2 keys, doubling owner GET-RPCs PR-37 preferred_segment env - MOONCAKE_PREFERRED_SEGMENT env var falls through to rdma_utils.py - run_vllm_with_mooncake_owner.sh exports it for the spawned vLLM MultiConnector bind_gpu_block_pool proxy - allow simple_cpu_backend-style child connectors to bind to the GPU block pool when wrapped by MultiConnector (PD-disaggregated setups) Validation ========== End-to-end mndp run (Qwen3-8B DP=4, 100 conv × 3 turns × 32 concurrent, 16K input, --gpu-memory-utilization 0.4 --num-gpu-blocks-override 1024, 4 GiB owner CPU pool to force SSD spillover): - 99/100 conversations completed - 219 tier-log lines, 100% with disk_keys>0, 0 failed_keys - 59.5 GB read back from SSD - After PR-36 layered on: Mean TTFT -61%, Mean E2EL -58%, tier-log batches halved (219 → 115) confirming count-trigger removal Layout ====== The owner-client commits assumed flat module layout (mooncake_store_*.py) while feat/mooncake-store-connector kept store/ subdir. Reconciled to flat layout to match upstream PR-40900 author's pre-revert state. Related ======= - vllm-project#40900 — parent PR (basic connector); this stacks on it - ivanium#31 — segment-port readiness probe (folded in) - ivanium#32 — VLLM_MOONCAKE_STORE_TIER_LOG (folded in) - ivanium#36 — enable_offload gate + count-trigger removal (folded in) - ivanium#37 — MOONCAKE_PREFERRED_SEGMENT env (folded in) - kvcache-ai/Mooncake#2083 — Mooncake-side standalone-binary disk-read fix
zhewenl
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May 12, 2026
…og + perf fixes Squashed forward-port of feat/mooncake-store-int-owner-client + PR-32 (tier-log) + PR-31 (segment readiness probe) + PR-36 (enable_offload gate + count-trigger removal) + PR-37 (preferred_segment env) + bind_gpu_block_pool MultiConnector fix, on top of the rebased feat/mooncake-store-connector. What lands ========== Owner-client topology - scripts/mooncake/: master + owner launcher + RDMA auto-detection helpers - mndp.yaml: Kimi-K2.5-NVFP4 / Qwen3-8B DP=4 vigil recipe - vllm/distributed/.../mooncake/rdma_utils.py: RNIC + GID detection - requester-only setup refactor: vLLM ranks pass global_segment_size=0; the separate mooncake_client owner contributes the CPU pool + SSD tier Disk offload (re-introduced after intentional revert on PR-40900) - batch budget tracking with backpressure - batch-splitting for disk-tier loads - LookupKeyServer wiring (restored after cherry-pick drop) - store_py.cpp + standalone-binary fixes are companion in kvcache-ai#2083 PR-32 observability - VLLM_MOONCAKE_STORE_TIER_LOG=1: per-batch "Mooncake load tier summary" lines showing memory_keys/disk_keys/unknown_keys/success_keys/failed_keys and bytes_by_tier breakdown PR-36 perf - _get_disk_offload_buffer_budget_bytes(enable_offload) returns None when off - enable_offload field on MooncakeStoreConfig (read from JSON or MOONCAKE_ENABLE_OFFLOAD env) - dropped redundant count-based split trigger that was firing on every batch with ≥2 keys, doubling owner GET-RPCs PR-37 preferred_segment env - MOONCAKE_PREFERRED_SEGMENT env var falls through to rdma_utils.py - run_vllm_with_mooncake_owner.sh exports it for the spawned vLLM MultiConnector bind_gpu_block_pool proxy - allow simple_cpu_backend-style child connectors to bind to the GPU block pool when wrapped by MultiConnector (PD-disaggregated setups) Validation ========== End-to-end mndp run (Qwen3-8B DP=4, 100 conv × 3 turns × 32 concurrent, 16K input, --gpu-memory-utilization 0.4 --num-gpu-blocks-override 1024, 4 GiB owner CPU pool to force SSD spillover): - 99/100 conversations completed - 219 tier-log lines, 100% with disk_keys>0, 0 failed_keys - 59.5 GB read back from SSD - After PR-36 layered on: Mean TTFT -61%, Mean E2EL -58%, tier-log batches halved (219 → 115) confirming count-trigger removal Layout ====== The owner-client commits assumed flat module layout (mooncake_store_*.py) while feat/mooncake-store-connector kept store/ subdir. Reconciled to flat layout to match upstream PR-40900 author's pre-revert state. Related ======= - vllm-project#40900 — parent PR (basic connector); this stacks on it - ivanium#31 — segment-port readiness probe (folded in) - ivanium#32 — VLLM_MOONCAKE_STORE_TIER_LOG (folded in) - ivanium#36 — enable_offload gate + count-trigger removal (folded in) - ivanium#37 — MOONCAKE_PREFERRED_SEGMENT env (folded in) - kvcache-ai/Mooncake#2083 — Mooncake-side standalone-binary disk-read fix
zhewenl
pushed a commit
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May 13, 2026
…og + perf fixes Squashed forward-port of feat/mooncake-store-int-owner-client + PR-32 (tier-log) + PR-31 (segment readiness probe) + PR-36 (enable_offload gate + count-trigger removal) + PR-37 (preferred_segment env) + bind_gpu_block_pool MultiConnector fix, on top of the rebased feat/mooncake-store-connector. What lands ========== Owner-client topology - scripts/mooncake/: master + owner launcher + RDMA auto-detection helpers - mndp.yaml: Kimi-K2.5-NVFP4 / Qwen3-8B DP=4 vigil recipe - vllm/distributed/.../mooncake/rdma_utils.py: RNIC + GID detection - requester-only setup refactor: vLLM ranks pass global_segment_size=0; the separate mooncake_client owner contributes the CPU pool + SSD tier Disk offload (re-introduced after intentional revert on PR-40900) - batch budget tracking with backpressure - batch-splitting for disk-tier loads - LookupKeyServer wiring (restored after cherry-pick drop) - store_py.cpp + standalone-binary fixes are companion in kvcache-ai#2083 PR-32 observability - VLLM_MOONCAKE_STORE_TIER_LOG=1: per-batch "Mooncake load tier summary" lines showing memory_keys/disk_keys/unknown_keys/success_keys/failed_keys and bytes_by_tier breakdown PR-36 perf - _get_disk_offload_buffer_budget_bytes(enable_offload) returns None when off - enable_offload field on MooncakeStoreConfig (read from JSON or MOONCAKE_ENABLE_OFFLOAD env) - dropped redundant count-based split trigger that was firing on every batch with ≥2 keys, doubling owner GET-RPCs PR-37 preferred_segment env - MOONCAKE_PREFERRED_SEGMENT env var falls through to rdma_utils.py - run_vllm_with_mooncake_owner.sh exports it for the spawned vLLM MultiConnector bind_gpu_block_pool proxy - allow simple_cpu_backend-style child connectors to bind to the GPU block pool when wrapped by MultiConnector (PD-disaggregated setups) Validation ========== End-to-end mndp run (Qwen3-8B DP=4, 100 conv × 3 turns × 32 concurrent, 16K input, --gpu-memory-utilization 0.4 --num-gpu-blocks-override 1024, 4 GiB owner CPU pool to force SSD spillover): - 99/100 conversations completed - 219 tier-log lines, 100% with disk_keys>0, 0 failed_keys - 59.5 GB read back from SSD - After PR-36 layered on: Mean TTFT -61%, Mean E2EL -58%, tier-log batches halved (219 → 115) confirming count-trigger removal Layout ====== The owner-client commits assumed flat module layout (mooncake_store_*.py) while feat/mooncake-store-connector kept store/ subdir. Reconciled to flat layout to match upstream PR-40900 author's pre-revert state. Related ======= - vllm-project#40900 — parent PR (basic connector); this stacks on it - ivanium#31 — segment-port readiness probe (folded in) - ivanium#32 — VLLM_MOONCAKE_STORE_TIER_LOG (folded in) - ivanium#36 — enable_offload gate + count-trigger removal (folded in) - ivanium#37 — MOONCAKE_PREFERRED_SEGMENT env (folded in) - kvcache-ai/Mooncake#2083 — Mooncake-side standalone-binary disk-read fix
zhewenl
pushed a commit
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May 13, 2026
…og + perf fixes Squashed forward-port of feat/mooncake-store-int-owner-client + PR-32 (tier-log) + PR-31 (segment readiness probe) + PR-36 (enable_offload gate + count-trigger removal) + PR-37 (preferred_segment env) + bind_gpu_block_pool MultiConnector fix, on top of the rebased feat/mooncake-store-connector. What lands ========== Owner-client topology - scripts/mooncake/: master + owner launcher + RDMA auto-detection helpers - mndp.yaml: Kimi-K2.5-NVFP4 / Qwen3-8B DP=4 vigil recipe - vllm/distributed/.../mooncake/rdma_utils.py: RNIC + GID detection - requester-only setup refactor: vLLM ranks pass global_segment_size=0; the separate mooncake_client owner contributes the CPU pool + SSD tier Disk offload (re-introduced after intentional revert on PR-40900) - batch budget tracking with backpressure - batch-splitting for disk-tier loads - LookupKeyServer wiring (restored after cherry-pick drop) - store_py.cpp + standalone-binary fixes are companion in kvcache-ai#2083 PR-32 observability - VLLM_MOONCAKE_STORE_TIER_LOG=1: per-batch "Mooncake load tier summary" lines showing memory_keys/disk_keys/unknown_keys/success_keys/failed_keys and bytes_by_tier breakdown PR-36 perf - _get_disk_offload_buffer_budget_bytes(enable_offload) returns None when off - enable_offload field on MooncakeStoreConfig (read from JSON or MOONCAKE_ENABLE_OFFLOAD env) - dropped redundant count-based split trigger that was firing on every batch with ≥2 keys, doubling owner GET-RPCs PR-37 preferred_segment env - MOONCAKE_PREFERRED_SEGMENT env var falls through to rdma_utils.py - run_vllm_with_mooncake_owner.sh exports it for the spawned vLLM MultiConnector bind_gpu_block_pool proxy - allow simple_cpu_backend-style child connectors to bind to the GPU block pool when wrapped by MultiConnector (PD-disaggregated setups) Validation ========== End-to-end mndp run (Qwen3-8B DP=4, 100 conv × 3 turns × 32 concurrent, 16K input, --gpu-memory-utilization 0.4 --num-gpu-blocks-override 1024, 4 GiB owner CPU pool to force SSD spillover): - 99/100 conversations completed - 219 tier-log lines, 100% with disk_keys>0, 0 failed_keys - 59.5 GB read back from SSD - After PR-36 layered on: Mean TTFT -61%, Mean E2EL -58%, tier-log batches halved (219 → 115) confirming count-trigger removal Layout ====== The owner-client commits assumed flat module layout (mooncake_store_*.py) while feat/mooncake-store-connector kept store/ subdir. Reconciled to flat layout to match upstream PR-40900 author's pre-revert state. Related ======= - vllm-project#40900 — parent PR (basic connector); this stacks on it - ivanium#31 — segment-port readiness probe (folded in) - ivanium#32 — VLLM_MOONCAKE_STORE_TIER_LOG (folded in) - ivanium#36 — enable_offload gate + count-trigger removal (folded in) - ivanium#37 — MOONCAKE_PREFERRED_SEGMENT env (folded in) - kvcache-ai/Mooncake#2083 — Mooncake-side standalone-binary disk-read fix
zhewenl
pushed a commit
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May 13, 2026
…og + perf fixes Squashed forward-port of feat/mooncake-store-int-owner-client + PR-32 (tier-log) + PR-31 (segment readiness probe) + PR-36 (enable_offload gate + count-trigger removal) + PR-37 (preferred_segment env) + bind_gpu_block_pool MultiConnector fix, on top of the rebased feat/mooncake-store-connector. What lands ========== Owner-client topology - scripts/mooncake/: master + owner launcher + RDMA auto-detection helpers - mndp.yaml: Kimi-K2.5-NVFP4 / Qwen3-8B DP=4 vigil recipe - vllm/distributed/.../mooncake/rdma_utils.py: RNIC + GID detection - requester-only setup refactor: vLLM ranks pass global_segment_size=0; the separate mooncake_client owner contributes the CPU pool + SSD tier Disk offload (re-introduced after intentional revert on PR-40900) - batch budget tracking with backpressure - batch-splitting for disk-tier loads - LookupKeyServer wiring (restored after cherry-pick drop) - store_py.cpp + standalone-binary fixes are companion in kvcache-ai#2083 PR-32 observability - VLLM_MOONCAKE_STORE_TIER_LOG=1: per-batch "Mooncake load tier summary" lines showing memory_keys/disk_keys/unknown_keys/success_keys/failed_keys and bytes_by_tier breakdown PR-36 perf - _get_disk_offload_buffer_budget_bytes(enable_offload) returns None when off - enable_offload field on MooncakeStoreConfig (read from JSON or MOONCAKE_ENABLE_OFFLOAD env) - dropped redundant count-based split trigger that was firing on every batch with ≥2 keys, doubling owner GET-RPCs PR-37 preferred_segment env - MOONCAKE_PREFERRED_SEGMENT env var falls through to rdma_utils.py - run_vllm_with_mooncake_owner.sh exports it for the spawned vLLM MultiConnector bind_gpu_block_pool proxy - allow simple_cpu_backend-style child connectors to bind to the GPU block pool when wrapped by MultiConnector (PD-disaggregated setups) Validation ========== End-to-end mndp run (Qwen3-8B DP=4, 100 conv × 3 turns × 32 concurrent, 16K input, --gpu-memory-utilization 0.4 --num-gpu-blocks-override 1024, 4 GiB owner CPU pool to force SSD spillover): - 99/100 conversations completed - 219 tier-log lines, 100% with disk_keys>0, 0 failed_keys - 59.5 GB read back from SSD - After PR-36 layered on: Mean TTFT -61%, Mean E2EL -58%, tier-log batches halved (219 → 115) confirming count-trigger removal Layout ====== The owner-client commits assumed flat module layout (mooncake_store_*.py) while feat/mooncake-store-connector kept store/ subdir. Reconciled to flat layout to match upstream PR-40900 author's pre-revert state. Related ======= - vllm-project#40900 — parent PR (basic connector); this stacks on it - ivanium#31 — segment-port readiness probe (folded in) - ivanium#32 — VLLM_MOONCAKE_STORE_TIER_LOG (folded in) - ivanium#36 — enable_offload gate + count-trigger removal (folded in) - ivanium#37 — MOONCAKE_PREFERRED_SEGMENT env (folded in) - kvcache-ai/Mooncake#2083 — Mooncake-side standalone-binary disk-read fix
zhewenl
pushed a commit
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that referenced
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May 13, 2026
…og + perf fixes Squashed forward-port of feat/mooncake-store-int-owner-client + PR-32 (tier-log) + PR-31 (segment readiness probe) + PR-36 (enable_offload gate + count-trigger removal) + PR-37 (preferred_segment env) + bind_gpu_block_pool MultiConnector fix, on top of the rebased feat/mooncake-store-connector. What lands ========== Owner-client topology - scripts/mooncake/: master + owner launcher + RDMA auto-detection helpers - mndp.yaml: Kimi-K2.5-NVFP4 / Qwen3-8B DP=4 vigil recipe - vllm/distributed/.../mooncake/rdma_utils.py: RNIC + GID detection - requester-only setup refactor: vLLM ranks pass global_segment_size=0; the separate mooncake_client owner contributes the CPU pool + SSD tier Disk offload (re-introduced after intentional revert on PR-40900) - batch budget tracking with backpressure - batch-splitting for disk-tier loads - LookupKeyServer wiring (restored after cherry-pick drop) - store_py.cpp + standalone-binary fixes are companion in kvcache-ai#2083 PR-32 observability - VLLM_MOONCAKE_STORE_TIER_LOG=1: per-batch "Mooncake load tier summary" lines showing memory_keys/disk_keys/unknown_keys/success_keys/failed_keys and bytes_by_tier breakdown PR-36 perf - _get_disk_offload_buffer_budget_bytes(enable_offload) returns None when off - enable_offload field on MooncakeStoreConfig (read from JSON or MOONCAKE_ENABLE_OFFLOAD env) - dropped redundant count-based split trigger that was firing on every batch with ≥2 keys, doubling owner GET-RPCs PR-37 preferred_segment env - MOONCAKE_PREFERRED_SEGMENT env var falls through to rdma_utils.py - run_vllm_with_mooncake_owner.sh exports it for the spawned vLLM MultiConnector bind_gpu_block_pool proxy - allow simple_cpu_backend-style child connectors to bind to the GPU block pool when wrapped by MultiConnector (PD-disaggregated setups) Validation ========== End-to-end mndp run (Qwen3-8B DP=4, 100 conv × 3 turns × 32 concurrent, 16K input, --gpu-memory-utilization 0.4 --num-gpu-blocks-override 1024, 4 GiB owner CPU pool to force SSD spillover): - 99/100 conversations completed - 219 tier-log lines, 100% with disk_keys>0, 0 failed_keys - 59.5 GB read back from SSD - After PR-36 layered on: Mean TTFT -61%, Mean E2EL -58%, tier-log batches halved (219 → 115) confirming count-trigger removal Layout ====== The owner-client commits assumed flat module layout (mooncake_store_*.py) while feat/mooncake-store-connector kept store/ subdir. Reconciled to flat layout to match upstream PR-40900 author's pre-revert state. Related ======= - vllm-project#40900 — parent PR (basic connector); this stacks on it - ivanium#31 — segment-port readiness probe (folded in) - ivanium#32 — VLLM_MOONCAKE_STORE_TIER_LOG (folded in) - ivanium#36 — enable_offload gate + count-trigger removal (folded in) - ivanium#37 — MOONCAKE_PREFERRED_SEGMENT env (folded in) - kvcache-ai/Mooncake#2083 — Mooncake-side standalone-binary disk-read fix
zhewenl
pushed a commit
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that referenced
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May 13, 2026
…og + perf fixes Squashed forward-port of feat/mooncake-store-int-owner-client + PR-32 (tier-log) + PR-31 (segment readiness probe) + PR-36 (enable_offload gate + count-trigger removal) + PR-37 (preferred_segment env) + bind_gpu_block_pool MultiConnector fix, on top of the rebased feat/mooncake-store-connector. What lands ========== Owner-client topology - scripts/mooncake/: master + owner launcher + RDMA auto-detection helpers - mndp.yaml: Kimi-K2.5-NVFP4 / Qwen3-8B DP=4 vigil recipe - vllm/distributed/.../mooncake/rdma_utils.py: RNIC + GID detection - requester-only setup refactor: vLLM ranks pass global_segment_size=0; the separate mooncake_client owner contributes the CPU pool + SSD tier Disk offload (re-introduced after intentional revert on PR-40900) - batch budget tracking with backpressure - batch-splitting for disk-tier loads - LookupKeyServer wiring (restored after cherry-pick drop) - store_py.cpp + standalone-binary fixes are companion in kvcache-ai#2083 PR-32 observability - VLLM_MOONCAKE_STORE_TIER_LOG=1: per-batch "Mooncake load tier summary" lines showing memory_keys/disk_keys/unknown_keys/success_keys/failed_keys and bytes_by_tier breakdown PR-36 perf - _get_disk_offload_buffer_budget_bytes(enable_offload) returns None when off - enable_offload field on MooncakeStoreConfig (read from JSON or MOONCAKE_ENABLE_OFFLOAD env) - dropped redundant count-based split trigger that was firing on every batch with ≥2 keys, doubling owner GET-RPCs PR-37 preferred_segment env - MOONCAKE_PREFERRED_SEGMENT env var falls through to rdma_utils.py - run_vllm_with_mooncake_owner.sh exports it for the spawned vLLM MultiConnector bind_gpu_block_pool proxy - allow simple_cpu_backend-style child connectors to bind to the GPU block pool when wrapped by MultiConnector (PD-disaggregated setups) Validation ========== End-to-end mndp run (Qwen3-8B DP=4, 100 conv × 3 turns × 32 concurrent, 16K input, --gpu-memory-utilization 0.4 --num-gpu-blocks-override 1024, 4 GiB owner CPU pool to force SSD spillover): - 99/100 conversations completed - 219 tier-log lines, 100% with disk_keys>0, 0 failed_keys - 59.5 GB read back from SSD - After PR-36 layered on: Mean TTFT -61%, Mean E2EL -58%, tier-log batches halved (219 → 115) confirming count-trigger removal Layout ====== The owner-client commits assumed flat module layout (mooncake_store_*.py) while feat/mooncake-store-connector kept store/ subdir. Reconciled to flat layout to match upstream PR-40900 author's pre-revert state. Related ======= - vllm-project#40900 — parent PR (basic connector); this stacks on it - ivanium#31 — segment-port readiness probe (folded in) - ivanium#32 — VLLM_MOONCAKE_STORE_TIER_LOG (folded in) - ivanium#36 — enable_offload gate + count-trigger removal (folded in) - ivanium#37 — MOONCAKE_PREFERRED_SEGMENT env (folded in) - kvcache-ai/Mooncake#2083 — Mooncake-side standalone-binary disk-read fix
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May 13, 2026
…og + perf fixes Squashed forward-port of feat/mooncake-store-int-owner-client + PR-32 (tier-log) + PR-31 (segment readiness probe) + PR-36 (enable_offload gate + count-trigger removal) + PR-37 (preferred_segment env) + bind_gpu_block_pool MultiConnector fix, on top of the rebased feat/mooncake-store-connector. What lands ========== Owner-client topology - scripts/mooncake/: master + owner launcher + RDMA auto-detection helpers - mndp.yaml: Kimi-K2.5-NVFP4 / Qwen3-8B DP=4 vigil recipe - vllm/distributed/.../mooncake/rdma_utils.py: RNIC + GID detection - requester-only setup refactor: vLLM ranks pass global_segment_size=0; the separate mooncake_client owner contributes the CPU pool + SSD tier Disk offload (re-introduced after intentional revert on PR-40900) - batch budget tracking with backpressure - batch-splitting for disk-tier loads - LookupKeyServer wiring (restored after cherry-pick drop) - store_py.cpp + standalone-binary fixes are companion in kvcache-ai#2083 PR-32 observability - VLLM_MOONCAKE_STORE_TIER_LOG=1: per-batch "Mooncake load tier summary" lines showing memory_keys/disk_keys/unknown_keys/success_keys/failed_keys and bytes_by_tier breakdown PR-36 perf - _get_disk_offload_buffer_budget_bytes(enable_offload) returns None when off - enable_offload field on MooncakeStoreConfig (read from JSON or MOONCAKE_ENABLE_OFFLOAD env) - dropped redundant count-based split trigger that was firing on every batch with ≥2 keys, doubling owner GET-RPCs PR-37 preferred_segment env - MOONCAKE_PREFERRED_SEGMENT env var falls through to rdma_utils.py - run_vllm_with_mooncake_owner.sh exports it for the spawned vLLM MultiConnector bind_gpu_block_pool proxy - allow simple_cpu_backend-style child connectors to bind to the GPU block pool when wrapped by MultiConnector (PD-disaggregated setups) Validation ========== End-to-end mndp run (Qwen3-8B DP=4, 100 conv × 3 turns × 32 concurrent, 16K input, --gpu-memory-utilization 0.4 --num-gpu-blocks-override 1024, 4 GiB owner CPU pool to force SSD spillover): - 99/100 conversations completed - 219 tier-log lines, 100% with disk_keys>0, 0 failed_keys - 59.5 GB read back from SSD - After PR-36 layered on: Mean TTFT -61%, Mean E2EL -58%, tier-log batches halved (219 → 115) confirming count-trigger removal Layout ====== The owner-client commits assumed flat module layout (mooncake_store_*.py) while feat/mooncake-store-connector kept store/ subdir. Reconciled to flat layout to match upstream PR-40900 author's pre-revert state. Related ======= - vllm-project#40900 — parent PR (basic connector); this stacks on it - ivanium#31 — segment-port readiness probe (folded in) - ivanium#32 — VLLM_MOONCAKE_STORE_TIER_LOG (folded in) - ivanium#36 — enable_offload gate + count-trigger removal (folded in) - ivanium#37 — MOONCAKE_PREFERRED_SEGMENT env (folded in) - kvcache-ai/Mooncake#2083 — Mooncake-side standalone-binary disk-read fix
zhewenl
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to zhewenl/vllm
that referenced
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May 13, 2026
…og + perf fixes Squashed forward-port of feat/mooncake-store-int-owner-client + PR-32 (tier-log) + PR-31 (segment readiness probe) + PR-36 (enable_offload gate + count-trigger removal) + PR-37 (preferred_segment env) + bind_gpu_block_pool MultiConnector fix, on top of the rebased feat/mooncake-store-connector. What lands ========== Owner-client topology - scripts/mooncake/: master + owner launcher + RDMA auto-detection helpers - mndp.yaml: Kimi-K2.5-NVFP4 / Qwen3-8B DP=4 vigil recipe - vllm/distributed/.../mooncake/rdma_utils.py: RNIC + GID detection - requester-only setup refactor: vLLM ranks pass global_segment_size=0; the separate mooncake_client owner contributes the CPU pool + SSD tier Disk offload (re-introduced after intentional revert on PR-40900) - batch budget tracking with backpressure - batch-splitting for disk-tier loads - LookupKeyServer wiring (restored after cherry-pick drop) - store_py.cpp + standalone-binary fixes are companion in kvcache-ai#2083 PR-32 observability - VLLM_MOONCAKE_STORE_TIER_LOG=1: per-batch "Mooncake load tier summary" lines showing memory_keys/disk_keys/unknown_keys/success_keys/failed_keys and bytes_by_tier breakdown PR-36 perf - _get_disk_offload_buffer_budget_bytes(enable_offload) returns None when off - enable_offload field on MooncakeStoreConfig (read from JSON or MOONCAKE_ENABLE_OFFLOAD env) - dropped redundant count-based split trigger that was firing on every batch with ≥2 keys, doubling owner GET-RPCs PR-37 preferred_segment env - MOONCAKE_PREFERRED_SEGMENT env var falls through to rdma_utils.py - run_vllm_with_mooncake_owner.sh exports it for the spawned vLLM MultiConnector bind_gpu_block_pool proxy - allow simple_cpu_backend-style child connectors to bind to the GPU block pool when wrapped by MultiConnector (PD-disaggregated setups) Validation ========== End-to-end mndp run (Qwen3-8B DP=4, 100 conv × 3 turns × 32 concurrent, 16K input, --gpu-memory-utilization 0.4 --num-gpu-blocks-override 1024, 4 GiB owner CPU pool to force SSD spillover): - 99/100 conversations completed - 219 tier-log lines, 100% with disk_keys>0, 0 failed_keys - 59.5 GB read back from SSD - After PR-36 layered on: Mean TTFT -61%, Mean E2EL -58%, tier-log batches halved (219 → 115) confirming count-trigger removal Layout ====== The owner-client commits assumed flat module layout (mooncake_store_*.py) while feat/mooncake-store-connector kept store/ subdir. Reconciled to flat layout to match upstream PR-40900 author's pre-revert state. Related ======= - vllm-project#40900 — parent PR (basic connector); this stacks on it - ivanium#31 — segment-port readiness probe (folded in) - ivanium#32 — VLLM_MOONCAKE_STORE_TIER_LOG (folded in) - ivanium#36 — enable_offload gate + count-trigger removal (folded in) - ivanium#37 — MOONCAKE_PREFERRED_SEGMENT env (folded in) - kvcache-ai/Mooncake#2083 — Mooncake-side standalone-binary disk-read fix
zhewenl
pushed a commit
to zhewenl/vllm
that referenced
this pull request
May 13, 2026
…og + perf fixes Squashed forward-port of feat/mooncake-store-int-owner-client + PR-32 (tier-log) + PR-31 (segment readiness probe) + PR-36 (enable_offload gate + count-trigger removal) + PR-37 (preferred_segment env) + bind_gpu_block_pool MultiConnector fix, on top of the rebased feat/mooncake-store-connector. What lands ========== Owner-client topology - scripts/mooncake/: master + owner launcher + RDMA auto-detection helpers - mndp.yaml: Kimi-K2.5-NVFP4 / Qwen3-8B DP=4 vigil recipe - vllm/distributed/.../mooncake/rdma_utils.py: RNIC + GID detection - requester-only setup refactor: vLLM ranks pass global_segment_size=0; the separate mooncake_client owner contributes the CPU pool + SSD tier Disk offload (re-introduced after intentional revert on PR-40900) - batch budget tracking with backpressure - batch-splitting for disk-tier loads - LookupKeyServer wiring (restored after cherry-pick drop) - store_py.cpp + standalone-binary fixes are companion in kvcache-ai#2083 PR-32 observability - VLLM_MOONCAKE_STORE_TIER_LOG=1: per-batch "Mooncake load tier summary" lines showing memory_keys/disk_keys/unknown_keys/success_keys/failed_keys and bytes_by_tier breakdown PR-36 perf - _get_disk_offload_buffer_budget_bytes(enable_offload) returns None when off - enable_offload field on MooncakeStoreConfig (read from JSON or MOONCAKE_ENABLE_OFFLOAD env) - dropped redundant count-based split trigger that was firing on every batch with ≥2 keys, doubling owner GET-RPCs PR-37 preferred_segment env - MOONCAKE_PREFERRED_SEGMENT env var falls through to rdma_utils.py - run_vllm_with_mooncake_owner.sh exports it for the spawned vLLM MultiConnector bind_gpu_block_pool proxy - allow simple_cpu_backend-style child connectors to bind to the GPU block pool when wrapped by MultiConnector (PD-disaggregated setups) Validation ========== End-to-end mndp run (Qwen3-8B DP=4, 100 conv × 3 turns × 32 concurrent, 16K input, --gpu-memory-utilization 0.4 --num-gpu-blocks-override 1024, 4 GiB owner CPU pool to force SSD spillover): - 99/100 conversations completed - 219 tier-log lines, 100% with disk_keys>0, 0 failed_keys - 59.5 GB read back from SSD - After PR-36 layered on: Mean TTFT -61%, Mean E2EL -58%, tier-log batches halved (219 → 115) confirming count-trigger removal Layout ====== The owner-client commits assumed flat module layout (mooncake_store_*.py) while feat/mooncake-store-connector kept store/ subdir. Reconciled to flat layout to match upstream PR-40900 author's pre-revert state. Related ======= - vllm-project#40900 — parent PR (basic connector); this stacks on it - ivanium#31 — segment-port readiness probe (folded in) - ivanium#32 — VLLM_MOONCAKE_STORE_TIER_LOG (folded in) - ivanium#36 — enable_offload gate + count-trigger removal (folded in) - ivanium#37 — MOONCAKE_PREFERRED_SEGMENT env (folded in) - kvcache-ai/Mooncake#2083 — Mooncake-side standalone-binary disk-read fix
huangyibo
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May 21, 2026
Co-authored-by: aoshen524 <aoshen524@gmail.com>
huangyibo
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Jun 4, 2026
Co-authored-by: aoshen524 <aoshen524@gmail.com>
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Problem
Owner-client deployments need MooncakeStore puts to prefer the node-local owner segment. With a shared YAML recipe,
preferred_segmentis per-instance state and should be injected by the launcher or owner wrapper after it determines the node-local advertised host.Changes
extra_config.preferred_segmentas the highest-priority override for backwards compatibility and manual overrides.MOONCAKE_PREFERRED_SEGMENT=<owner_host>:<owner_segment_port>fromrun_vllm_with_mooncake_owner.sh.MOONCAKE_PREFERRED_SEGMENTas the narrow vLLM fallback when no explicitpreferred_segmentis configured.--kv-transfer-configinjection when the wrapped vLLM command already supplies one, so PD MultiConnector recipes can still use the managed owner path./metrics; topology selection stays with the component that starts the node-local owner and knows its advertisedhost:port.Why this is not duplicating an existing PR
I checked the related open work in this fork before updating the PR. This is the small wrapper + vLLM consumer path for the owner-wrapper-provided
MOONCAKE_PREFERRED_SEGMENThint, and no open PR in this fork currently carries that complete path.Validation
bash -n scripts/mooncake/run_vllm_with_mooncake_owner.sh uv run --active --no-sync /home/aoshen/code/uv_envs/py312/bin/python -m pytest \ tests/v1/kv_connector/unit/test_mooncake_store_worker.py \ -k 'get_configured_preferred_segment' -vResult:
4 passed, 26 deselected.AI assistance
AI assistance was used. The submitting human should review every changed line and validate the deployment behavior before merge.
Co-authored-by: OpenAI Codex codex@openai.com