feat(ascend): honor plugin-advertised hami-core percentage budget - #2952
feat(ascend): honor plugin-advertised hami-core percentage budget#2952curry30000 wants to merge 5 commits into
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe Ascend plugin infers Hami-core mode for positive core requests, normalizes physical budgets to 100, honors advertised budgets above 100, and rejects conflicting full-core allocations. Tests cover oversell capacity, sharing, legacy requests, and init-container exclusivity. ChangesAscend Hami-core scheduling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change updates Ascend hami-core scheduling budgets for scaled device-plugin core advertisements while retaining full-core exclusivity. No actionable merge-blocking risk is currently identified. Sequence Diagram(s)sequenceDiagram
participant Pod
participant MutateAdmission
participant Fit
participant AscendDevice
Pod->>MutateAdmission: submit core request
MutateAdmission->>Pod: infer huawei.com/vnpu-mode
Pod->>Fit: request Ascend device
Fit->>AscendDevice: calculate Hami-core budget
AscendDevice-->>Fit: return capacity and occupancy
Fit-->>Pod: admit or reject allocation
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Out of Scope Changes checkExplanation The budget and full-core exclusivity changes are within scope. However, adding template-mode inference and rejecting template-mode pods on hami-core nodes is not explicitly required by issue
✨ Finishing Touches🧪 Generate unit tests (beta)
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@DSFans2014 could you take a look when you have time? |
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I am not sure whether hami-vnpu-core currently supports core(NPU_PRIORITY) oversubscription. @archlitchi
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please resolve the conflicts |
| // non-oversold rejection reason as CardComputeUnitsExhausted. The requesting | ||
| // pod's own mode is irrelevant: only hami-core pods on non-hami-core nodes | ||
| // are filtered out, so a legacy vNPU pod still reaches an oversold card. | ||
| if dev.Used == 1 && dev.Usedcores >= hamiCorePercentBase { |
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Used == 1 misses the init-container case. A Pod can have an init container requesting 100 and two app containers requesting 30 each on the same card. CollapseInitContainerUsage takes the peak of each resource separately, so it records Usedcores=100, Slots=2. That makes dev.Used equal to 2 even before the init container finishes.
With a budget of 150, another Pod requesting 50 passes both the capacity check and this guard. I checked this with a test using CollapseInitContainerUsage and Fit: be3d1848 rejects it with CardInsufficientCore, while this branch accepts it.
Please cover this case and preserve the exclusive reservation across init/app phases. Dropping Used == 1 alone would block normal shared workloads once their combined usage reaches 100, so the aggregate counters aren't enough to tell these cases apart.
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You're right, and the trace checks out: CollapseInitContainerUsage takes the peak cores and the peak slots independently, so the 100 / 30 / 30 pod lands as Usedcores=100, Slots=2 and the scheduler rebuilds it as Used=2. The guard never fires.
Instead of adding a field to carry exclusivity, I kept it local to the ascend path and read the per-pod collapsed entries already hanging off the device: if a single pod holds the full base on that card, oversell is off for it. Two pods at 50 each stay below the base individually, so they keep sharing — the case you warned about removing Used == 1 would break.
Keep the hami-core 100-point Fit budget so physical AICore values (20/24/32) do not change Coresreq admission. When the coupled plugin advertises Devcore > 100 via deviceCoreScaling, use that percentage. Signed-off-by: curry30000 <32156223+curry30000@users.noreply.github.com>
An oversold budget lifts effectiveTotalCore above the 100 held by an exclusive occupant, so neither the core capacity check nor CardComputeUnitsExhausted rejects a later pod. Fit only filters hami-core pods off non-hami-core nodes, so a legacy vNPU pod still reached such a card. Drop the mode condition from the exclusivity guard. Name the percentage base instead of repeating 100, and log at V(5) when an advertised Devcore is clamped back to it, which signals a plugin and scheduler configuration mismatch. Signed-off-by: curry30000 <32156223+curry30000@users.noreply.github.com>
The exclusive-occupant guard ran before the CardComputeUnitsExhausted check, so a full card without oversell (Totalcore 100, Usedcores 100) began reporting ExclusiveDeviceAllocateConflict instead. Admission was unchanged but the reason surfaced to users was, which the previous commit did not intend. Move the guard after that check. Oversell is unaffected: with an advertised budget of 150 the occupant's 100 never equals effectiveTotalCore, so CardComputeUnitsExhausted cannot fire and the guard still rejects. Signed-off-by: curry30000 <32156223+curry30000@users.noreply.github.com>
CollapseInitContainerUsage takes the peak core usage and the peak slot count independently, so a Pod whose init container reserves a whole card and whose app containers then run alongside is stored as Usedcores at the percentage base with two slots. The scheduler rebuilds that as Used=2, so the dev.Used == 1 guard did not recognize the reservation and an oversold budget admitted a second tenant onto an exclusively held card. Identify the occupant from the per-Pod collapsed entries on the device instead. A Pod holding the base on the card blocks oversell; two Pods holding half each stay below it and keep sharing the card, so legitimate shared allocations that add up to the base are unaffected. Signed-off-by: curry30000 <32156223+curry30000@users.noreply.github.com>
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Inline comments:
In `@pkg/device/ascend/device.go`:
- Line 620: Update the 100-core exclusivity guard in the device allocation logic
to also trigger when nodeSupportHamiCore is enabled, preventing legacy
unannotated 100-core requests from sharing partially allocated oversold
hami-core devices. Add a regression case covering a legacy 100-core request
after partial hami-core use.
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pkg/device/ascend/device.gopkg/device/ascend/device_test.go
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…e nodes A pod that declares no vnpu-mode leaves isHAMiCore false, so its budget stays at dev.Totalcore instead of the percentage base. Once the plugin advertises an oversold Devcore neither arm of the exclusivity guard held, and a 100-core request was admitted onto a card that already carried a 50-core allocation. Without oversell the capacity check rejected that request first, so the gap only appears above the base budget. Gate the guard on the node as well: where hami-core is enabled, a request at the percentage base means the whole card whether or not the pod spells the mode out. Signed-off-by: curry30000 <32156223+curry30000@users.noreply.github.com>
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What type of PR is this?
/kind feature
What this PR does / why we need it:
Ascend hami-core
Coresreqis a 0-100 percentage. On current nodes the plugin advertises physical AICore asTotalcore(8/20/24/30), which is not that percentage.This change keeps a 100-point Fit budget by default. It only uses the advertised
Totalcorewhen the device plugin reportsDevcore > 100.It is meant to be used with Project-HAMi/ascend-device-plugin#132. That plugin PR registers
Devcore = round(100 * deviceCoreScaling). This scheduler PR consumes that advertised value. The scaling knob stays on the plugin (hamiVnpuCore.deviceCoreScaling). HAMi Helm is not changed.Totalcore <= 100: budget stays 100Totalcore > 100: budget is the advertised valueCoresreq=100stays exclusive when the budget is oversold-core: "30"still fits when physicalTotalcoreis 20Which issue(s) this PR fixes:
Fixes #2951
Special notes for your reviewer:
AI assistance: Cursor helped draft the patch. I reviewed the Fit budget and exclusive checks. I wrote the commit messages.
Hardware (scheduler extender Fit):
deviceCoreScaling=1.5(advertised Devcore 150)-core: "30"and 1 with-core: "20"on the same UUID: all scheduled (110 <= 150)CardInsufficientCore)Totalcore=20still admits-core: "30"go test ./pkg/device/...andgolangci-lint run ./pkg/device/ascend/...pass.Does this PR introduce a user-facing change?:
No. Behavior changes only when the coupled plugin advertises
Devcore > 100.Summary by CodeRabbit