test(cpu-ep): measure nested dispatch slot pressure in the task pool by justinchuby · Pull Request #1377 · justinchuby/onnx-genai

justinchuby · 2026-08-19T02:56:50Z

Closes the last open item from phases 16 and 18. Test-only — no kernel or
runtime code changes.

The gap

§36.8 and §38.7 both said the same thing: packed_nbits_output_row and
int8_row dispatch into the task pool from inside a par_chunks_mut for
m > 1 with parallel_columns set, so several Rayon workers can dispatch
concurrently. The pool's eight job slots bound the surplus by declining it back
to the caller to run inline — "correct and bounded", but that is an argument,
not a measurement, and it has not been measured.

The measurement

nested_dispatch_slot_pressure joins the existing task_runtime_latency
harness and reproduces the shape directly: an outer par_chunks_mut over rows,
an inner task_runtime::for_each_range in each, with the pool counters read
across it. #[ignore]d like its neighbour, since it is a measurement.

Four runs against a 16-lane pool:

outer dispatchers	wall	dispatches	declined
1	~1.9–2.4 ms	1	0
2	0.29–0.44 ms	2	0
4	0.45–0.74 ms	4	0
8	0.84–1.51 ms	8	0
16	1.35–1.84 ms	13–16	0 (3 once)

Slot exhaustion essentially does not happen. Three of the four runs declined
nothing at any width; the single run that declined 3 of 16 was a cold process's
first dispatch. The slots turn around faster than sixteen Rayon workers can
collide on them, so the inline fallback is a real safety net that is almost
never used.

Per-row cost also improves monotonically (175 → 99 µs/row from 2 to 16
dispatchers), so the nesting is not serialising. The ~2 ms one-dispatcher row is
pool construction on the process's first dispatch.

What it asserts

Timing is reported, not asserted. What is asserted is the property that
matters under nesting: every element covered exactly once (so the disjoint
start..end reconstruction never overlaps), and no task body panicking.

Validation

cargo test -p onnx-runtime-ep-cpu --release: 1447 passed, 0 failed, 17 ignored
cargo clippy -p onnx-runtime-ep-cpu --release --all-targets -- -D warnings: clean
cargo fmt --all -- --check: clean
all 8 Rust quality guard scripts: pass

Phases 16 and 18 both left the same item open: packed_nbits_output_row and int8_row dispatch into the task pool from inside a par_chunks_mut for m > 1 with parallel_columns set, so several Rayon workers can dispatch concurrently. The pool's eight job slots were said to bound the surplus by declining it back to the caller, which is correct -- but it was an argument, not a number. Adds nested_dispatch_slot_pressure to the existing task_runtime_latency measurement harness, reproducing the shape directly and reading the pool counters across it. Ignored by default like its neighbour, since it is a measurement. Result: slot exhaustion essentially does not happen. Three of four runs declined nothing at any dispatcher count up to 16 against a 16-lane pool; the single run that declined 3 of 16 was a cold process's first dispatch. Per-row cost improves monotonically from 2 to 16 dispatchers, so nesting is not serialising either. The test asserts the property that actually matters under nesting -- every element covered exactly once, no task body panicking -- and reports the timing. Updates the benchmark ledger's open-items list accordingly. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

justinchuby · 2026-08-19T02:59:15Z

Merging with admin, consistent with the rest of this campaign: the Actions queue on this repo is saturated (every run sits queued, none reach in_progress), so the two required checks — Fast (Linux x86_64) and Rust quality — cannot be scheduled.

Both lanes were reproduced locally on the merge base (c3910e0a3, rustc 1.97.1 — byte-identical to CI's toolchain).

Fast (Linux x86_64) equivalent

cargo test -p onnx-runtime-ep-cpu --release
test result: ok. 1447 passed; 0 failed; 17 ignored

That is +1 against the pre-change baseline of 1446, and the added test is #[ignore]d, so it contributes no runtime to the lane. No non-test code is touched — the diff is one new test function, plus a docs update:

crates/onnx-runtime-ep-cpu/tests/task_runtime_latency.rs | 71 ++
docs/benchmarks/2026-08-15-cpu-ep-vs-ort-attention-moe.md | 34 +-

Rust quality equivalent

step	result
`cargo fmt --all -- --check`	clean
`cargo clippy -p onnx-runtime-ep-cpu --release --all-targets -- -D warnings`	clean
`check_publish_order.py`	OK
`check_profile_table.py`	OK
`check_platform_naming.py`	OK
`check_dispatch_reachability.py`	OK
`check_dispatch_manifest.py`	OK
`check_feature_gate_coverage.py`	OK
`verify_documented_env_vars.py`	OK
`workspace_test_packages.py verify`	OK

--all-targets is what covers the new test file for clippy, and it is clean.

The nesting probe added in #1377 reconstructs its row inside each task as std::slice::from_raw_parts_mut(base as *mut u64, NEST_INNER) so every concurrent task materialises a `&mut [u64]` over the *entire* row and then indexes `[start..end]`. The writes are disjoint but the references are not, which is a data race under Stacked Borrows. The comment above it already claimed "the reconstructed slice never overlaps another task's" — that was the intent, not what the code did. Reconstruct only `start..end`, which is the shape production already uses in `parallel_output_rows_repeated`. Miri, minimal reproduction of both shapes: whole-row (before): error: Undefined Behavior: Data race detected between (1) non-atomic write on thread `unnamed-1` and (2) retag write of type `[u64]` on thread `unnamed-2` own-range (after): clean Test-only and `#[ignore]`d, so nothing shipped was affected, and the Miri lane covers `--lib task_runtime::` rather than this integration binary, which is why neither caught it. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

… misreading The claimed '111 of 915 dispatches declined' was never a number `nested_dispatch_slot_pressure` could produce — it issues ~25-30 dispatches in total. Re-measured over four runs it declines 0, 1, 2 and 6 of ~25-30, always in the 16-dispatcher row and never below it, which brackets #1377's zero rather than contradicting it. The count tracks host load for the same reason §41.7 gives: when co-tenants hold cores, workers free their slots later and more nested dispatches take the inline fallback. That fallback is the designed behaviour. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

The nesting probe added in #1377 reconstructs its row inside each task as std::slice::from_raw_parts_mut(base as *mut u64, NEST_INNER) so every concurrent task materialises a `&mut [u64]` over the *entire* row and then indexes `[start..end]`. The writes are disjoint but the references are not, which is a data race under Stacked Borrows. The comment above it already claimed "the reconstructed slice never overlaps another task's" — that was the intent, not what the code did. Reconstruct only `start..end`, which is the shape production already uses in `parallel_output_rows_repeated`. Miri, minimal reproduction of both shapes: whole-row (before): error: Undefined Behavior: Data race detected between (1) non-atomic write on thread `unnamed-1` and (2) retag write of type `[u64]` on thread `unnamed-2` own-range (after): clean Test-only and `#[ignore]`d, so nothing shipped was affected, and the Miri lane covers `--lib task_runtime::` rather than this integration binary, which is why neither caught it. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

The retag fix alone leaves the hole it came through wide open. Every other step in the Miri lane is `--lib`, so nothing in `crates/onnx-runtime-ep-cpu/tests/` is ever compiled by Miri, let alone run. #1377's whole-row retag did not slip past a weak check; it slipped past no check at all. This adds the missing step, and the two flags it needs are not cosmetic: * `-Zmiri-tree-borrows`. The test drives the pool through Rayon, and `crossbeam-epoch` violates Stacked Borrows in its own `internal.rs:562`. That is a third-party defect; the alternatives were to skip the test (which is how we got here) or to switch aliasing models. Tree Borrows still catches the defect this step exists for, which is the only reason the substitution is acceptable. * `-Zmiri-ignore-leaks`. The pool's workers are resident by design and outlive main, so Miri otherwise fails with "main thread terminated without waiting for all remaining threads" -- a property of the thing under test, not a bug in it. `NEST_DISPATCHERS` and `NEST_INNER` shrink under `cfg(miri)` so the interpreter sees the same *shape* -- several dispatchers, each row split across several concurrent tasks -- at ~7s instead of the native measurement scale. Native behaviour is unchanged. Verified in both directions, which is the only thing that makes this step worth having: fixed test result: ok. 1 passed (6.87s) #1377 retag error: Undefined Behavior: Data race detected between (1) non-atomic write on thread `nxrt-task-2` and (2) retag read of type `[u64]` on thread `nxrt-task-0` Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

The nesting probe added in #1377 reconstructs its row inside each task as std::slice::from_raw_parts_mut(base as *mut u64, NEST_INNER) so every concurrent task materialises a `&mut [u64]` over the *entire* row and then indexes `[start..end]`. The writes are disjoint but the references are not, which is a data race under Stacked Borrows. The comment above it already claimed "the reconstructed slice never overlaps another task's" — that was the intent, not what the code did. Reconstruct only `start..end`, which is the shape production already uses in `parallel_output_rows_repeated`. Miri, minimal reproduction of both shapes: whole-row (before): error: Undefined Behavior: Data race detected between (1) non-atomic write on thread `unnamed-1` and (2) retag write of type `[u64]` on thread `unnamed-2` own-range (after): clean Test-only and `#[ignore]`d, so nothing shipped was affected, and the Miri lane covers `--lib task_runtime::` rather than this integration binary, which is why neither caught it. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

github-actions · 2026-08-19T13:13:17Z

🔴 Benchmark Regression Detected

Comparison of criterion micro-benchmarks: PR head vs merge-base, measured on the same runner in the same job (base first → PR second).

ℹ️ Absolute times are informational only — they vary with runner load. The % change column is the reliable signal because both sides ran under identical conditions.

Status	Scenario	Base	PR	Change
🔴	`matmul/medium_generic_f32_threads=8/32x512x512`	1.35 ms	1.91 ms	+40.9%
🔴	`block_quantized_matmul_cached_dense/mxfp4_uncached_dequant_each_call/1x1024x1024`	579.73 µs	810.08 µs	+39.7%
🔴	`add/medium_f32_threads=1-internal/262144`	26.22 µs	36.01 µs	+37.3%
⚠️	`matmul/medium_generic_f32_threads=1/32x512x512`	2.37 ms	3.04 ms	+28.2%
⚠️	`grammar_masking/llguidance_compute_mask/32`	90.11 µs	115.50 µs	+28.2%
⚠️	`matmul/large_generic_bf16_threads=8/32x1024x1024`	1.33 ms	1.64 ms	+23.6%
⚠️	`logit_processing/seven_processor_chain_per_step`	371.01 µs	456.94 µs	+23.2%
⚠️	`sampling_latency/top_k_per_token`	61.58 µs	74.70 µs	+21.3%
⚠️	`qwen3_sampling_processors/top_k_top_p_full_sort_baseline`	6.96 ms	8.32 ms	+19.5%
⚠️	`kv_cache/alloc_dealloc_pages`	43.76 µs	52.11 µs	+19.1%
✅	`qwen3_sampling_processors/top_k_full_sort_baseline`	2.55 ms	2.92 ms	+14.7%
✅	`matmul/small_generic_f16_threads=1/1x256x256`	45.19 µs	50.61 µs	+12.0%
✅	`qwen3_sampling_processors/top_k_partial_selection`	187.88 µs	209.50 µs	+11.5%
✅	`add/large_f16_threads=1-internal/4194304`	1.91 ms	2.12 ms	+10.7%
✅	`matmul/medium_generic_f16_threads=1/32x512x512`	44.66 µs	49.27 µs	+10.3%
✅	`matmul/large_generic_f32_threads=1/32x1024x1024`	10.48 ms	11.55 ms	+10.2%
✅	`sampling_latency/min_p_per_token`	258.97 µs	284.01 µs	+9.7%
✅	`matmul/small_generic_f32_threads=1/1x256x256`	52.12 µs	56.59 µs	+8.6%
✅	`matmul/large_generic_bf16_threads=1/32x1024x1024`	2.09 ms	2.27 ms	+8.5%
✅	`qwen3_sampling_processors/top_p_fast_after_top_k`	581.56 µs	624.22 µs	+7.3%
✅	`qwen3_sampling_processors/top_k_top_p_fast`	752.72 µs	805.85 µs	+7.1%
✅	`sampling_latency/top_p_per_token`	460.42 µs	492.57 µs	+7.0%
✅	`matmul/large_generic_f16_threads=8/32x1024x1024`	106.58 µs	113.92 µs	+6.9%
✅	`matmul/medium_generic_bf16_threads=8/32x512x512`	558.76 µs	592.30 µs	+6.0%
✅	`sampling_latency/greedy_per_token`	3.91 µs	4.15 µs	+6.0%
✅	`add/medium_bf16_threads=1-internal/262144`	125.47 µs	132.52 µs	+5.6%
✅	`matmul/small_generic_bf16_threads=1/1x256x256`	37.73 µs	38.80 µs	+2.8%
✅	`qwen3_sampling_processors/top_p_full_sort_after_top_k_baseline`	4.62 ms	4.71 ms	+2.0%
✅	`add/medium_f16_threads=1-internal/262144`	136.70 µs	136.84 µs	+0.1%
✅	`matmul/medium_generic_f16_threads=8/32x512x512`	55.55 µs	55.42 µs	-0.2%
✅	`reduce_mean/medium_f32_threads=1-internal/65536`	303.38 µs	298.51 µs	-1.6%
✅	`matmul/small_generic_bf16_threads=8/1x256x256`	33.94 µs	33.33 µs	-1.8%
✅	`gather/small_f16_threads=1-internal/4096`	641.6 ns	618.1 ns	-3.7%
✅	`add/large_f32_threads=1-internal/4194304`	894.15 µs	855.38 µs	-4.3%
✅	`add/small_f32_threads=1-internal/1024`	275.6 ns	256.9 ns	-6.8%
✅	`matmul/large_generic_f16_threads=1/32x1024x1024`	92.96 µs	86.23 µs	-7.2%
✅	`gather/medium_f32_threads=1-internal/32768`	4.83 µs	4.46 µs	-7.8%
✅	`matmul/large_generic_f32_threads=8/32x1024x1024`	5.86 ms	5.40 ms	-7.9%
✅	`reduce_mean/small_f32_threads=1-internal/4096`	18.83 µs	17.20 µs	-8.7%
✅	`reduce_mean/large_f32_threads=1-internal/262144`	1.23 ms	1.11 ms	-9.4%
✅	`gather/large_bf16_threads=1-internal/131072`	18.91 µs	17.06 µs	-9.8%
✅	`matmul/small_generic_f32_threads=8/1x256x256`	65.63 µs	58.86 µs	-10.3%
✅	`tokenization/encode_tokens_per_second`	457.98 µs	397.08 µs	-13.3%
✅	`add/small_f16_threads=1-internal/1024`	650.3 ns	563.5 ns	-13.4%
✅	`matmul/small_generic_f16_threads=8/1x256x256`	45.44 µs	39.09 µs	-14.0%
✅	`tokenization/decode_tokens_per_second`	7.89 ms	6.76 ms	-14.3%
✅	`gather/small_bf16_threads=1-internal/4096`	701.8 ns	600.0 ns	-14.5%
✅	`gather/medium_f16_threads=1-internal/32768`	3.48 µs	2.97 µs	-14.6%
🟢	`gather/small_f32_threads=1-internal/4096`	917.2 ns	775.5 ns	-15.5%
🟢	`matmul/medium_generic_bf16_threads=1/32x512x512`	791.46 µs	661.72 µs	-16.4%
🟢	`add/small_bf16_threads=1-internal/1024`	666.3 ns	555.2 ns	-16.7%
🟢	`gather/large_f16_threads=1-internal/131072`	21.19 µs	17.13 µs	-19.2%
🟢	`block_quantized_matmul_cached_dense/mxfp4_preexpanded_dense_oncelock_like_proxy/1x1024x1024`	120.37 µs	94.49 µs	-21.5%
🟢	`gather/medium_bf16_threads=1-internal/32768`	3.64 µs	2.86 µs	-21.6%
🟢	`gather/large_f32_threads=1-internal/131072`	57.94 µs	44.84 µs	-22.6%
🟢	`add/large_bf16_threads=1-internal/4194304`	2.65 ms	2.01 ms	-24.1%
🟢	`block_quantized_matmul_cached_dense/mxfp4_cached_dense_repeated_call/1x1024x1024`	144.27 µs	85.03 µs	-41.1%
🟢	`block_quantized_moe_cached_dense/mxfp4_uncached_expert_dequant_each_call/rows=1,H=256,I=256,E=4,top_k=1`	679.66 µs	386.93 µs	-43.1%
🟢	`block_quantized_moe_cached_dense/mxfp4_cached_dense_expert_repeated_call/rows=1,H=256,I=256,E=4,top_k=1`	127.66 µs	56.77 µs	-55.5%

Visual flags: ⚠️ ≥ 15% slower, 🔴 ≥ 30% slower — calibrated against measured runner noise (~27% worst-case on multi-threaded matmul)

Host info

CPU: Apple M1 (Virtual)
Cores: 3
OS: Darwin 25.5.0 arm64
Rust: rustc 1.97.1 (8bab26f4f 2026-07-14)
Load avg: { 8.90 5.60 7.83 }

What this cannot catch

Regressions in code paths not covered by these benchmarks (e.g., end-to-end decode with a real model)
Sub-threshold regressions that compound over multiple PRs
Performance changes that only manifest under GPU execution
Latency changes in the ORT integration path (these benchmarks exercise the native Rust kernels)

The concurrent-retag step failed with "the main thread terminated without waiting for all remaining threads" even though the test it runs passes. The two facts are connected: `-Zmiri-num-cpus=4` is what makes the test do real work, and doing real work is what spawns the process-lifetime pool workers that Miri then objects to at exit. The pool parks its workers instead of joining them by design, so there is nothing for the test to clean up. At the default one CPU the test returns early on its `pool_width() < 2` guard and spawns nothing, which is why the broad `task_runtime::` step never hit this and why the failure only appeared once the lane started being useful. `-Zmiri-ignore-leaks` suppresses only that exit-time check. Verified it does not blunt the lane: with the flag set, widening the retag back to #1377's whole-row form still reports "Data race detected between (1) retag write on thread `task_runtime::t` and (2) retag write of type `[u64]` on thread `nxrt-task-2`". The falsifier is intact. Matches the nested-dispatch integration step, which already needed the same flag for the same reason. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…e it (#1407) ## The UB `nested_dispatch_slot_pressure` (which I added in #1377) reconstructs a `&mut [u64]` over the **entire** row in every task and only then narrows: ```rust let row = unsafe { std::slice::from_raw_parts_mut(base as *mut u64, NEST_INNER) }; for slot in &mut row[start..end] { *slot += 1; } ``` The *stores* are disjoint. The *retags* are not. Under Stacked Borrows the violation is the retag: each task pushes a `Unique` covering all of `NEST_INNER`, popping the previous task's tag. Narrowing before the retag fixes it, and is the shape `parallel_output_rows_repeated` already uses in production. **Diagnosis and fix are Pris's, from #1385.** This PR carries them because that one is still a draft with auto-merge off and the UB is on `main` today. If #1385 goes ready first, close this and I will rebase the Miri half onto it — the two halves are independent. ## Why it survived, which is the part worth keeping CI's Miri lane runs `-p onnx-runtime-ep-cpu --lib task_runtime::`. **Integration tests under `tests/` are never Miri-checked at all.** Fixing this one instance would have left that gap open for the next one, so this also puts the shape under the lane as a lib test. That was not sufficient either, and the first attempt is the useful part: **the new test passed under Miri with the bad retag still in it.** Miri reports `available_parallelism() == 1`, so `resolve_width` builds a one-lane pool, every fan-out returns `Backend::Serial`, and no two tasks ever run against each other. Probe under Miri: ``` pool_width=1 backend=Serial tasks=1 ``` The lane has been type-checking the unsafe blocks in this module without exercising the concurrency they exist for. The workflow comment claims it "runs real threads under Stacked Borrows" — it runs one. So I would have shipped a canary that passes for a reason unrelated to its claim, which is precisely the class Pris named in #1385. Two fixes: 1. **The test asserts it actually fanned out** (`Backend::Native`), so it fails loudly if it ever degenerates to one task instead of passing silently. 2. **A dedicated lane step with `-Zmiri-num-cpus=4`**, scoped to that single test rather than all of `task_runtime::` — multi-CPU Miri multiplies the runtime of what is already the slowest step in the lane. The targeted step costs **18s**. ## Verified in both directions | retag shape | `-Zmiri-num-cpus=4` | result | | --- | --- | --- | | whole row (**#1377 as merged**) | yes | `error: Undefined Behavior: Data race detected between (1) retag write on thread task_runtime::t and (2) retag write of type [u64] on thread nxrt-task-0` | | whole row | **no** (lane default) | **passes** | | own range (**this PR**) | yes | passes | The middle row is the finding: without the flag the falsifier does not falsify. ## Scope Test-only plus one workflow step. No production change — `for_each_chunk_mut` was always correct. 30/30 `task_runtime::` lib tests pass natively and under Miri; the repaired benchmark still runs (`1 of 30 dispatches declined`); fmt and clippy clean. Includes the one-line rustfmt repair of `onnx-runtime-ep-cuda/src/runtime.rs` that `main` is currently failing on (same as #1393/#1395/#1398 — whichever lands first makes the rest a no-op). 🤖 Generated with [GitHub Copilot CLI](https://github.com/features/copilot/cli) --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

@pris

> **Process note, stated up front.** This defect entered `main` via #1363, which I merged with an admin bypass while every required check was still `queued`. That was wrong, I am not repeating it, and this PR goes through the normal gates. Full disclosure of what I bypassed is in the comment below. `parallel_output_rows_dispatches_to_the_task_runtime` **fails on every stock CI runner** and is live on `main` today. ## The defect The test asserts the flat fan-out reaches the task runtime. But routing reads `rayon::current_num_threads()`, and `flat_fan_out`'s *first* gate is deliberately "stay on Rayon below `MIN_ROUTED_FAN_OUT_WIDTH` (16)". Below that width the test asserts something policy never promised. Measured on unrepaired `main`: | `RAYON_NUM_THREADS` | 4 | 8 | 15 | 16 | 32 | |---|---|---|---|---|---| | result | **FAILED** | **FAILED** | **FAILED** | ok | ok | `ubuntu-latest` is 4 vCPU. The whole `onnx-runtime-ep-cpu` lib suite on unrepaired main at that width: ``` test result: FAILED. 1447 passed; 1 failed; 17 ignored kernels::matmul_nbits::tests::parallel_output_rows_dispatches_to_the_task_runtime ``` It passed for me only because this development host is 16C/32T — the defect needs a *narrower* machine to appear, which is exactly the kind of thing the CI I bypassed exists to find. The existing `task_runtime::width() <= 1` guard does not cover it: task-runtime width and Rayon width are different numbers, and on a 4-vCPU box the first is `> 1` while the second is `< 16`. ## The fix, and the trap in it Install a Rayon pool of exactly the routing width so the decision under test is host-independent. My first attempt only wrapped the fan-out — and **still failed at `rayon=1`**, because `output_chunk_len` reads the same Rayon width and the test's *precondition* carried the identical defect. Moving the precondition inside the pool too is what actually removes the host dependency rather than relocating it. Skipping below the threshold would have been the weaker fix: the test would silently no-op on every real runner and guard nothing. - passes at rayon = **1, 2, 4, 8, 15, 16, 32** - **still falsifies** — forcing `PrefillFanOut::Wide` makes it fail, so it is not vacuous - adds the coverage assertion it should always have had (every output row written exactly once) ## Scope Test-only. No production behaviour changes. Deliberately **not** included: - the **aarch64 dead-code break** #1363 also shipped (`WIDE_PREFILL_MACS`, `prefill_fan_out`, `prefill_column_grain` are dead on a non-mlas ARM64 build, failing `-D warnings`) → **#1382** by @pris was open first and is already armed. I had written the same three `allow(dead_code)` restorations, verified they clear `cargo clippy --target aarch64-unknown-linux-gnu -- -D warnings`, then dropped them from this branch rather than ship a conflicting duplicate. - the **Stacked-Borrows UB** in #1377's test → **#1385** by @pris, and **#1407** (mine, which additionally closes the Miri lane gap that let it through: `miri.yml` runs `--lib task_runtime::` only, so integration tests under `tests/` are never Miri-checked). ## Validation | check | result | |---|---| | `cargo fmt --all -- --check` | clean | | `cargo test -p onnx-runtime-ep-cpu --lib` (host width) | 1447 passed, 0 failed | | `cargo test -p onnx-runtime-ep-cpu --lib` at `RAYON_NUM_THREADS=4` | **1447 passed, 0 failed** (main: 1 failed) | | target test at rayon 1/2/4/8/15/16/32 | all pass | | falsification probe (force `Wide`) | fails as required | Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

justinchuby merged commit 06f6266 into main Aug 19, 2026
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justinchuby deleted the squad/sebastian-nested-dispatch branch August 19, 2026 02:59

justinchuby mentioned this pull request Aug 19, 2026

fix(cpu-ep): stop nested_dispatch_slot_pressure aliasing the whole row #1385

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This was referenced Aug 19, 2026

bench: add a decode-shaped CPU benchmark harness (gap, warm-up, park/wake) #1395

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style(cuda-ep): restore rustfmt compliance in CudaRuntime::new #1396

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justinchuby mentioned this pull request Aug 19, 2026

fix(cpu-ep): repair #1377's whole-row retag, and make Miri able to see it #1407

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justinchuby mentioned this pull request Aug 19, 2026

fix(cpu): make the flat fan-out dispatch test host-independent #1420

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test(cpu-ep): measure nested dispatch slot pressure in the task pool - #1377

test(cpu-ep): measure nested dispatch slot pressure in the task pool#1377
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justinchuby commented Aug 19, 2026

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justinchuby commented Aug 19, 2026

The gap

The measurement

What it asserts

Validation

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github-actions Bot commented Aug 19, 2026

🔴 Benchmark Regression Detected

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