Make RAM accounting cgroup aware with dynamic limit probing - #15766
Make RAM accounting cgroup aware with dynamic limit probing#15766cgf120 wants to merge 4 commits into
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…imit psutil reads /proc/meminfo, which is not namespaced. Inside a container with a memory limit it therefore reports the host's RAM rather than the limit the process is actually killed at. Every RAM pressure decision compares against host-wide numbers, never frees anything, and the kernel OOM-kills the process. On a 32 GiB container on a 58 GiB host, ComfyUI reported 59919 MB total RAM and sized its pinned memory budget at 42.51 GiB, 133% of the real limit. Add comfy/cgroup_memory.py, which clamps total and available to the active cgroup limit, and route the eight RAM sizing call sites through it. When there is no limit -- bare metal, or an unconstrained container -- psutil's values are returned untouched, so those systems are unaffected. Notable details: - available subtracts inactive_file from memory.current. The page cache is reclaimed long before the kernel kills anything, so counting it as used reports a nearly full cgroup and causes constant, pointless eviction. This is the working set convention used by cAdvisor and the kubelet. - Swap is not counted. A cgroup may allow unlimited swap while the host's swap is exhausted, which would reintroduce the over-reporting. - Limits at or above physical RAM, memory.max of "max", and the cgroup v1 unlimited sentinel are all treated as no limit. - Probing is Linux only, so Windows and macOS never touch this path. That also keeps it away from mps, which can be shared into containers. - memory.high is ignored; it throttles rather than kills. Fixes Comfy-Org#14938 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Resolve the process' own cgroup hierarchy and read the limit and the usage from the same level, so a child's limit can no longer be paired with the host root's usage under --cgroupns=host. The most binding ancestor limit wins, which also picks up a limit inherited from a parent. Reject negative values in memory.max and memory.limit_in_bytes, and rename the module to system_memory so callers do not name the implementation.
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage | Docstring coverage is 46.15% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 52 functions across 5 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
| Check name | Status | Explanation |
|---|---|---|
| Title check | ✅ Passed | The title clearly summarizes the PR's main change: dynamic cgroup-aware RAM accounting. |
| Description check | ✅ Passed | The description directly explains the cgroup-aware RAM changes, fixes, tests, and validation results. |
| Linked Issues check | ✅ Passed | Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | ✅ Passed | Check skipped because no linked issues were found for this pull request. |
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Actionable comments posted: 2
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Inline comments:
In `@comfy/system_memory.py`:
- Around line 173-187: Update _resolve_scope so the cgroup memory-limit info
message is emitted only when the resolved limit changes, while preserving the
existing per-call probing needed for resize detection. Track the previously
logged resolved limit, including the transition to no limit, and suppress
repeated messages for unchanged values.
In `@tests-unit/comfy_test/system_memory_test.py`:
- Around line 67-76: Add a unit test for the v1 branch of _own_cgroup_scopes
using cgroup content with both memory and non-memory controller lines. Assert
that only the memory controller produces a scope rooted at CGROUP_V1_MEMORY_ROOT
with the parsed cgroup path appended, while non-memory controllers are ignored;
keep the existing v2 test unchanged.
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**/*
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Preserve existing APIs, node names, model-loading behavior, file layout, and workflow compatibility unless replacement is explicitly intended.
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execution.pycomfy/model_management.pycomfy_execution/caching.pycomfy/system_memory.pytests-unit/comfy_test/system_memory_test.py
**/*.py
📄 CodeRabbit inference engine (AGENTS.md)
**/*.py: Keep state and capability flags on the object that owns the behavior. Prefer explicit parent-owned attributes over probing child objects withgetattr; use child checks only when the child owns the delegated behavior.
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Remove inference-only training behavior such as dropout while preserving checkpoint and state-dict compatibility; usenn.Identitywhen deleting a module would alter keys or ordering.
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Treat dtype, device placement, VRAM use, and offloading as correctness concerns across CPU, CUDA, ROCm, MPS, DirectML, XPU, NPU, and low-VRAM environments.
Prefer existing ComfyUI and Comfy Kitchen operations, quantization helpers, cast/offload helpe...
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🪛 ast-grep (0.45.1)
comfy/system_memory.py
[warning] 36-36: File path is request-/variable-derived; validate and normalize to prevent path traversal.
Context: open(path, "r")
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
(open-filename-from-request)
🔇 Additional comments (6)
comfy/system_memory.py (2)
68-113: LGTM!
195-253: LGTM!tests-unit/comfy_test/system_memory_test.py (1)
89-161: LGTM!Also applies to: 205-341
comfy/model_management.py (1)
32-32: LGTM!Also applies to: 322-322, 365-365, 707-707, 721-721, 1755-1755
comfy_execution/caching.py (1)
7-7: LGTM!Also applies to: 551-551, 591-591
execution.py (1)
16-16: LGTM!Also applies to: 801-801
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@alexisrolland The follow-up PR now has the two review findings addressed, 30 targeted tests passing, CodeRabbit approval, and a successful CLA check. Could you please take a look when available? |
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I can't test this myself, we'll need cloud team to look into it and they are a bit stretched right now. Will se what we can do... |
3 participants
Summary
Follow-up/alternative to #15272. This branch carries @Joly0's cgroup-aware RAM accounting implementation and applies the four review fixes discussed on the original PR.
Fixes included:
psutil.virtual_memory()result in the malformed-limit test.The original PR commits are preserved for attribution. Please merge this PR or #15272, not both; if this branch is preferred, the original PR can be closed.
Validation
pytest -q tests-unit/comfy_test/system_memory_test.py— 28 passeddocker update --memory=256m.The patch also adds regression coverage for runtime cgroup resizing and unrelated fallback roots.