Refactor: make [STRACE] the only host-side timeline format - #2128
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📝 WalkthroughWalkthroughThe runtime now emits bind segments as ChangesBind segment span migration
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to Profiling tools can report incomplete or invalid span data and misclassify warm binds. Resolve these trace-analysis correctness issues before merging. Sequence Diagram(s)sequenceDiagram
participant HostBuildGraph
participant HostLog
participant hbg_bind_phases
participant phase_time_split
HostBuildGraph->>HostLog: emit chip.run.bind.<segment> spans
HostLog->>hbg_bind_phases: provide expanded logs
HostLog->>phase_time_split: provide expanded logs
hbg_bind_phases->>hbg_bind_phases: group by pid and inv
phase_time_split->>phase_time_split: split cold and warm segment spans
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In `@simpler_setup/tools/hbg_bind_phases.py`:
- Line 84: Update the span filters in hbg_bind_phases.py and phase_time_split.py
to accept bind segments only when span.depth equals 2, while retaining the
existing device and prefix checks. Add regression coverage confirming non-device
bind spans at depths 1 and 3 are excluded from statistics and timing rows.
In `@simpler_setup/tools/phase_time_split.py`:
- Line 148: Update main() to call cold_keys(rows) before removing rows with
missing counter fields, then filter incomplete rows only when computing
statistics so cold-key classification uses all parsed rows. Add a regression
test covering retained pid/inv/ts rows and ensuring a later valid bind is not
misclassified as cold.
In `@src/a2a3/runtime/host_build_graph/host/runtime_maker.cpp`:
- Around line 248-255: The counter-prefixed attribute formatting in
runtime_maker.cpp truncates into the local buffer without preserving the
required trailing “~” marker. Update the snprintf handling near the shown calls
to retain its result and mark the buffer when truncation occurs, ensuring
host_phase_record_bind and the logger receive the marker; apply the same change
at src/a2a3/runtime/host_build_graph/host/runtime_maker.cpp lines 248-255 and
src/a5/runtime/host_build_graph/host/runtime_maker.cpp lines 253-260 for runtime
parity.
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.claude/skills/hbg-bind-phases/SKILL.mddocs/dfx/hbg-bind-phases.mddocs/dfx/host-trace.mdsimpler_setup/tools/README.mdsimpler_setup/tools/__init__.pysimpler_setup/tools/hbg_bind_phases.pysimpler_setup/tools/phase_time_split.pysimpler_setup/tools/strace_timing.pysrc/a2a3/runtime/host_build_graph/docs/profiling_levels.mdsrc/a2a3/runtime/host_build_graph/host/runtime_maker.cppsrc/a5/runtime/host_build_graph/docs/profiling_levels.mdsrc/a5/runtime/host_build_graph/host/runtime_maker.cppsrc/common/host_build_graph/host/host_phase_trace.cppsrc/common/host_build_graph/host_phase_trace.hsrc/common/log/host_log.cppsrc/common/log/include/common/host_span.hsrc/common/platform/include/common/chip_swimlane_profiling.hsrc/common/platform/include/common/host_phase_kind.htests/ut/py/test_hbg_bind_phases_grouping.pytests/ut/py/test_hbg_bind_phases_torch_autoload.pytests/ut/py/test_host_timing_is_strace_only.pytests/ut/py/test_phase_time_split.pytests/ut/py/test_strace_timing.py
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@coderabbitai Addressed all three inline findings; the two real ones are fixed and folded into the single commit.
Re-verified after the fix: pyut 2126 passed, cpput 134/134, four platforms build clean, and a sim run still emits ten segment spans with no truncation. |
`[STRACE]` is the host's timeline format: one record per interval, and every view
in `strace_timing.py` is built from it. The device sub-phases already reach it the
long way round — the AICPU stamps cycles into a fixed-slot buffer, the host reads
it back after stream-sync and re-emits each phase as a span — so a fine-grained
capture mechanism and a single output format already coexist.
`host_build_graph`'s bind breakdown stopped one step short. Its segments each
carry a start and a duration, which is an interval, but they went out as
`bind phase=<p> start_ns=<n> dur_ns=<n>` `LOG_TIMING` lines: a second timeline
format, with its own regex in `strace_timing.py`, its own two tools, and 44 lines
of span synthesis to put it back on the timeline it was already on.
The reasons recorded for that choice do not survive contact with the tree:
- *"Every line is written at the end of the pass, so it carries its own
`start_ns`"* — `STRACE_HOST_SPAN_AT_A` exists for exactly that, and `chip.run`
itself is emitted with it.
- *"The marker grammar is a fixed per-run-stage contract, and a runtime's internal
breakdown of one stage does not belong in it"* (stated as an invariant in
`host-trace.md` and both `profiling_levels.md`) — the tensormap runtime already
subdivides its own bind stage with `chip.run.bind.args` and
`chip.run.bind.prebuilt`, the device sub-phases are that runtime's internal
breakdown at depth 3, and `ext.` opened the namespace to producers outside this
repository. Those three paragraphs are rewritten here.
Each segment is now `chip.run.bind.<segment>` at depth 2, emitted from the same
flush, inside the `STRACE("chip.run.bind")` scope on the thread that opened it —
so `(inv, hid)` and the depth come out right by construction, and the `tid` is the
real Linux tid instead of the pthread handle the log prefix carried and the
consumer had to discard.
## Two dead kinds go first
`HostPhaseKind::BindRelocate` and `BindSmH2d` have no `record_bind_phase` call
site in either architecture. They date from when the shared-memory image was
relocated and copied on its own; it now travels inside the single `arena_h2d`
copy as that segment's `sm=`. Everything downstream still carried them — the name
switch, `host_phase_kind_is_device_upload`, `_BIND_PHASE_NAMES`, and
`hbg_bind_phases`' `PHASE_ORDER` / `CONTROL_PLANE`, where they appeared in every
report as "absent from every bind".
Three places also disagreed about how many bind kinds there are: the enum comment
said twelve partition the stage, `host_phase_trace.cpp` repeated it, and
`profiling_levels.md` listed eleven. A run emits ten, and they do not partition
the stage — the stretch between one segment closing and the next opening belongs
to neither, in counts exactly as in time, which `runtime_maker.cpp`'s own
`BindPhaseMark` comment already said. Renumbering is safe: `HostPhaseRecord.kind`
is a process-local `uint32_t` and both artifacts persist the phase *name*.
## The gate does not change
`SIMPLER_HBG_BIND_BREAKDOWN_ENABLE` still defaults off, and that is deliberate
rather than inherited: `TraceState::active` is one flag serving two consumers, so
arming the segments also arms every per-task `ORCH_PHASE_*` hook — on dsv4, ~3700
extra clock reads inside the 2.6–4.9 ms `host_orch` segment being measured — and
each segment's attributes cost two `getrusage` pairs plus a thread-CPU read, 20
per bind. The instrumentation sits on the path it measures, which is why it is
opt-in; what this change is about is the *format*, not the default. Default output
volume is unchanged at zero, and ten spans replace ten lines when it is on.
## What the format change buys
- **A bind is `(pid, inv)`.** `hbg_bind_phases` loses 100 lines whose only purpose
was inventing that key: grouping on a repeated segment name, the
`--ranks`/`--rounds` back-inference, the ragged-bind warning, the "do not close
on `arena_h2d`" ordering trap, and three encoded grouping rules in its README.
Its own docstring said *"there is no field to group by instead"*; a span has
two. Concurrent ranks interleaving one stream now separate exactly.
- **`--tree` and the TPOT table show the segments with no flag and no artifact.**
The empty `chip.run.bind` bar its docstring complained about is populated.
- `phase_time_split`'s `[a-z_]+` phase pattern, which silently dropped every
`arena_h2d`, is gone with the regex.
## Consumer side
`_BIND_PHASE_RE` and `bind_phase_spans()` are deleted (neither had any test
coverage). `host_record_spans` keeps its bind branch — a chip-swimlane capture
arms the record pool with the breakdown switch off, and is then the only source —
but the dedup inverts: the log's span wins, because it carries the segment's
attributes where an artifact record carries only `detail`.
The attribute buffer is now the span attribute field's own width. It was 256
against a 192-byte field, so an overlong segment truncated twice — once unmarked
in the runtime, once marked by the logger. `SIMPLER_HOST_SPAN_*_CAPACITY` is
published from `host_span.h` and `kBindAttrsCapacity` derives from it, and
`record_bind_phase` now formats the kernel counters *before* the caller's
attributes: a truncation then eats a quantity the artifact's `detail` still has,
not a counter `phase_time_split` cannot work without.
Making the two widths equal moves the marking, so `record_bind_phase` checks its
own `snprintf` result and writes the `~` itself. The logger's marker cannot fire
any more — the value it receives always fits — and an unmarked cut would read as
a complete attribute list that is one field short.
`phase_time_split` decides warm-up over every bind the log holds, before it drops
the rows whose counters were cut. A truncated bind is still a bind that ran, so
dropping it first would make its successor the earliest one left and report that
genuinely warm bind's numbers as the cold row.
## The invariant
`tests/ut/py/test_host_timing_is_strace_only.py` pins it: no `LOG_TIMING` format
string in `src/` may carry a start timestamp. It carries its own positive control
and a case proving it can go red, because a guard that cannot fail is not a guard.
The summed `host-orch phase=` cost shares stay `LOG_TIMING` lines — kinds that
nest inside each other have no honest position on a timeline.
The three `grep -c 'bind phase='` acceptance gates in the `hbg-bind-phases` skill
move to the span pattern in the same change; leaving them would make every future
invocation report a working run as "no data".
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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`_task_interface._emit_host_span` has been the only way for a caller to put a
span on the host timeline: seven arguments, three of which (`invocation_id`,
`callable_hash`, `depth`) are our internal correlation keys that a caller can
only fill with zeros, and a timestamp the caller has to source itself. So
pypto-lib parses our `[STRACE]` output and prints its own phase timings in a
second format instead of writing into ours.
`simpler.trace` is the surface over that entry point: one producer, one span, one
gate. `producer(name)` returns an object carrying `span` and `enabled`; the
module-level names are that same pair on an unnamed default producer, in the
shape `random` exposes a hidden `Random` instance's — one call layer rather than a
wrapper per function, and no second implementation to drift from the one in
`Producer`.
Three properties hold by construction:
- **One clock.** The wrapper reads the clock, so a caller never handles a
timestamp. The new `_task_interface._monotonic_now_ns` binding exposes
`simpler::log::monotonic_now_ns` — the `steady_clock` every host record's
prefix and every C++ span already use — rather than leaving Python on
`time.monotonic_ns()` and relying on both mapping to `CLOCK_MONOTONIC`. That
agreement is a platform property, not a guarantee, and it is what
`test_the_span_carries_the_clock_the_native_records_are_stamped_with` would
catch on a platform that broke it. The binding also measures cheaper than
Python's clock here: 85 ns against 134 ns per call.
- **One namespace.** Every name is prefixed `ext.<producer>.`, so
`trace.span("node.dispatch")` emits `ext.pypto.node.dispatch`. One of our level
words is only ever a leaf, which is why nothing validates the name against
them: there is nothing a caller can pass that reaches our families, and a
rejecting check would add a failure mode without adding a guarantee. The
producer segment is per application rather than a single shared `ext.`, so
pypto-lib and a user script coexist in one process on separate lanes.
- **One gate.** `trace.enabled()` is `unified_log_host_span_enabled()`, the query
the C++ emit sites read. No second notion of "on", no new environment variable
or macro, no new verbosity level.
Two things issue hw-native-sys#1794's sketch asks for are deliberately absent, both because
they would put a second rule beside one of the three above:
- **No `instant()`.** A zero-duration span would be a second event concept, and
`dur=0` is already what our own emitting side writes for a phase that was never
stamped (`c_api_shared.cpp` skips a device phase whose duration reads back 0),
so a public API producing it would put two meanings on one value. A marker is
`with trace.span("checkpoint"): pass`, which records a real short interval.
- **No producer name derived from the running program.** The default is the
constant `app`. Deriving one from `argv[0]` needs a chain of special cases —
strip `.py`, fall back to the parent directory for `__main__`, substitute
illegal characters, fall back again when the result is empty — and one
`trace.producer("my_bench")` call names an application better than any of them.
Cost of one `with trace.span(name, k=v, k2=v2)` attempt, median of 7 batches of
200k iterations on this aarch64 box: 995 ns with the gate closed against 8998 ns
emitting. The closed-gate figure is Python's own floor rather than this path's
work — an empty pure-Python `with` block costs 272 ns there and the gate query
166 ns — so a caller in a genuinely hot loop asks `trace.enabled()` once instead
of opening a span per iteration. That is what the public query is for.
This is not a side channel for callers. hw-native-sys#2128 made `[STRACE]` the host's one
timeline format, so a caller's interval is a span for the same reason a runtime's
own bind segment is; what the reserved namespace separates is *whose* span it is,
not which format it uses. The docs say so where they describe the namespace, which
is why this waited for that change rather than landing first and claiming only
that it "uses the [STRACE] family".
It also corrects a stale cross-reference hw-native-sys#2128 left in the same file: the
principle paragraph pointed at `ext.` as "(below)" when that section is above it.
A decorated `async def` gets a coroutine wrapper. A sync wrapper around one
would time the coroutine's *creation* — a few hundred nanoseconds — and close the
span before the body ran, reporting wrong data rather than none. The branch is
taken at decoration, so the call path carries no extra test, and the regression
asserts a 10 ms `await` shows up as more than 5 ms.
`project-layout.md`'s note on the four transition-copy modules said the
`python/simpler` copies are excluded from the wheel via
`pyproject.toml::wheel.exclude`. That key was removed in hw-native-sys#552, so both copies
ship and the duplication is a source-tree convention rather than a packaging one.
The note now says which, and the table row above it stays as it is.
This PR does not declare the record format a supported external contract; the
`v=1` field exists for that decision and making it is separate from offering the
emitter.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
ChaoWao
added a commit
that referenced
this pull request
Sep 5, 2026
`_task_interface._emit_host_span` has been the only way for a caller to put a
span on the host timeline: seven arguments, three of which (`invocation_id`,
`callable_hash`, `depth`) are our internal correlation keys that a caller can
only fill with zeros, and a timestamp the caller has to source itself. So
pypto-lib parses our `[STRACE]` output and prints its own phase timings in a
second format instead of writing into ours.
`simpler.trace` is the surface over that entry point: one producer, one span, one
gate. `producer(name)` returns an object carrying `span` and `enabled`; the
module-level names are that same pair on an unnamed default producer, in the
shape `random` exposes a hidden `Random` instance's — one call layer rather than a
wrapper per function, and no second implementation to drift from the one in
`Producer`.
Three properties hold by construction:
- **One clock.** The wrapper reads the clock, so a caller never handles a
timestamp. The new `_task_interface._monotonic_now_ns` binding exposes
`simpler::log::monotonic_now_ns` — the `steady_clock` every host record's
prefix and every C++ span already use — rather than leaving Python on
`time.monotonic_ns()` and relying on both mapping to `CLOCK_MONOTONIC`. That
agreement is a platform property, not a guarantee, and it is what
`test_the_span_carries_the_clock_the_native_records_are_stamped_with` would
catch on a platform that broke it. The binding also measures cheaper than
Python's clock here: 85 ns against 134 ns per call.
- **One namespace.** Every name is prefixed `ext.<producer>.`, so
`trace.span("node.dispatch")` emits `ext.pypto.node.dispatch`. One of our level
words is only ever a leaf, which is why nothing validates the name against
them: there is nothing a caller can pass that reaches our families, and a
rejecting check would add a failure mode without adding a guarantee. The
producer segment is per application rather than a single shared `ext.`, so
pypto-lib and a user script coexist in one process on separate lanes.
- **One gate.** `trace.enabled()` is `unified_log_host_span_enabled()`, the query
the C++ emit sites read. No second notion of "on", no new environment variable
or macro, no new verbosity level.
Two things issue #1794's sketch asks for are deliberately absent, both because
they would put a second rule beside one of the three above:
- **No `instant()`.** A zero-duration span would be a second event concept, and
`dur=0` is already what our own emitting side writes for a phase that was never
stamped (`c_api_shared.cpp` skips a device phase whose duration reads back 0),
so a public API producing it would put two meanings on one value. A marker is
`with trace.span("checkpoint"): pass`, which records a real short interval.
- **No producer name derived from the running program.** The default is the
constant `app`. Deriving one from `argv[0]` needs a chain of special cases —
strip `.py`, fall back to the parent directory for `__main__`, substitute
illegal characters, fall back again when the result is empty — and one
`trace.producer("my_bench")` call names an application better than any of them.
Cost of one `with trace.span(name, k=v, k2=v2)` attempt, median of 7 batches of
200k iterations on this aarch64 box: 995 ns with the gate closed against 8998 ns
emitting. The closed-gate figure is Python's own floor rather than this path's
work — an empty pure-Python `with` block costs 272 ns there and the gate query
166 ns — so a caller in a genuinely hot loop asks `trace.enabled()` once instead
of opening a span per iteration. That is what the public query is for.
This is not a side channel for callers. #2128 made `[STRACE]` the host's one
timeline format, so a caller's interval is a span for the same reason a runtime's
own bind segment is; what the reserved namespace separates is *whose* span it is,
not which format it uses. The docs say so where they describe the namespace, which
is why this waited for that change rather than landing first and claiming only
that it "uses the [STRACE] family".
It also corrects a stale cross-reference #2128 left in the same file: the
principle paragraph pointed at `ext.` as "(below)" when that section is above it.
A decorated `async def` gets a coroutine wrapper. A sync wrapper around one
would time the coroutine's *creation* — a few hundred nanoseconds — and close the
span before the body ran, reporting wrong data rather than none. The branch is
taken at decoration, so the call path carries no extra test, and the regression
asserts a 10 ms `await` shows up as more than 5 ms.
`project-layout.md`'s note on the four transition-copy modules said the
`python/simpler` copies are excluded from the wheel via
`pyproject.toml::wheel.exclude`. That key was removed in #552, so both copies
ship and the duplication is a source-tree convention rather than a packaging one.
The note now says which, and the table row above it stays as it is.
This PR does not declare the record format a supported external contract; the
`v=1` field exists for that decision and making it is separate from offering the
emitter.
Collaborator
Author
|
Post-merge follow-up: the onboard measurement this PR's description listed as not run. Ran the Result: the effect is smaller than the run-to-run driftControl-plane minimum-of-sums (
The base arm's own drift across repetitions is larger than any base→measure difference: control plane 0.290 → 0.488 ms (+68%), wall 0.790 → 0.930 ms (+18%). Signs disagree across repetitions, which by the doc's rule means the runs were contended rather than that the effect is small. The stronger reading — mine, not the doc's — is the two repetitions taken with the box fully idle, the only ones where both arms ran under comparable conditions: qwen's control plane came out identical (0.290 = 0.290) and its wall differed by 0.8%; dsv4 differed by +3.7% / +1.5%. So the emit-path change is at or below ~2% on the one interval that contains it, with no consistent sign.
Queue state is quoted above per run because a performance number from this box without it is not quotable. The retargeted tool, verified on real hardwaredsv4 reports 12 binds, 10 warm, ranks=2 with no Three stale numbers in
|
| The doc says | Measured on 222062e51 |
|---|---|
qwen control plane 1.11–1.53 ms, host_orch 0.44–0.75 ms (47 tasks) |
0.29–0.49 / 0.19–0.40 ms — roughly 3× high |
dsv4 control plane 3.63–6.81 ms, host_orch 2.60–4.91 ms (1131 tasks) |
0.49–0.51 / 0.32–0.33 ms — an order of magnitude, though the doc does flag those as the 1131-task era and the case now submits 129 |
dsv4 "emits torch_backend_autoload: no" — so a dsv4 A/B "has no in-log witness for the autoload state" |
It does emit one, in both arms |
The third is the one that would actively mislead: it tells a reader that a dsv4 comparison cannot verify its autoload condition, when it can.
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Summary
[STRACE]is the host's timeline format — one record per interval, and every view instrace_timing.pyis built from it.host_build_graph's bind breakdown was the one interval-shaped data that stopped short of it, going out asbind phase=<p> start_ns=<n> dur_ns=<n>LOG_TIMINGlines: a second timeline format with its own regex, its own two tools, and 44 lines of span synthesis to put it back on the timeline it was already on.Each segment is now
chip.run.bind.<segment>at depth 2, emitted from the same end-of-bind flush inside theSTRACE("chip.run.bind")scope, so(inv, hid)and the depth are right by construction.BindRelocate/BindSmH2dhave no recording site in either arch; they showed up in every report as "absent from every bind". Three places also disagreed about how many bind kinds exist (12 / 12 / 11 — a run emits 10), and they do not partition the stage: the gap between one segment closing and the next opening belongs to neither.(pid, inv).hbg_bind_phasesloses ~100 lines whose only purpose was inventing that key — the repeated-segment-name grouping,--ranks/--roundsback-inference, the ragged-bind warning, the "do not close onarena_h2d" trap. Its docstring said "there is no field to group by instead"; a span has two, so concurrent ranks interleaving one stream now separate exactly.--treeand the TPOT table show the segments with no flag and no artifact. The emptychip.run.bindbar is populated.SIMPLER_HBG_BIND_BREAKDOWN_ENABLEstays default-off on purpose:TraceState::activeis one flag serving two consumers, so arming the segments also arms every per-taskORCH_PHASE_*hook (~3700 extra clock reads inside thehost_orchsegment being measured on dsv4). This change is about the format, not the default — default output volume is unchanged at zero.host_record_spanskeeps its bind branch (a chip-swimlane capture arms the pool with the switch off, and is then the only source), but the log's span now wins: it carries the segment's attributes where an artifact record carries onlydetail.phase_time_splitcannot work without.Three docs stated the opposite design as an invariant ("the marker grammar is a fixed per-run-stage contract, and a runtime's internal breakdown of one stage does not belong in it"). They are rewritten, because the tree already contradicts the premise three ways: the tensormap runtime subdivides its own bind stage with
chip.run.bind.args/.prebuilt, the device sub-phases are that runtime's internal breakdown at depth 3, andext.opened the namespace to producers outside this repo.tests/ut/py/test_host_timing_is_strace_only.pypins the invariant: noLOG_TIMINGformat string insrc/may carry a start timestamp. It carries its own positive control and a case proving it can go red. The summedhost-orch phase=cost shares stayLOG_TIMINGlines — kinds that nest inside each other have no honest position on a timeline.The three
grep -c 'bind phase='acceptance gates in thehbg-bind-phasesskill move to the span pattern in the same change; leaving them would make every future invocation report a working run as "no data".Testing
pytest tests/ut -m "not requires_hardware"— 2125 passed, 7 skippednative_run_lifecycle+graph_executionona2a3sim; runtimes build for a2a3 / a5 / a2a3sim / a5sima2a3simwith the breakdown on: ten segments at depth 2 withts/durinside the enclosingchip.run.bind, attributes complete with no~;hbg_bind_phasesreporting2 binds, 1 warmwith no rank or round argument;phase_time_splitsplitting all ten includingarena_h2d;--swimlane --host-phase-recordsdrawing each segment exactly once (10 segment(s) already in the log)hbg-bind-phasesskill's two modes on the qwen and dsv4 decode cases, and the before/after control-plane comparison, need 1–2 h of NPU time and have not been done. The numbers this change could perturb are the ones that recipe reads, so it is worth running before merge.One item from the plan was dropped deliberately: a scene-test assertion on real data.
host_phase_breakdown_enabled()caches in astatic const bool, so flipping the env in-process does nothing, and automating it needs a subprocess — which inside a scene test would re-enter the same test method. The contract is covered by the sim verification above plustest_strace_timing.py's synthetic cases; depth /(inv, hid)/ truncation on real data stay a manual check in the skill's recipe, whose gates this change already updated.