Feature: publish simpler.trace for a caller's own host spans - #2131
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📝 WalkthroughWalkthroughAdds ChangesPublic tracing API
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to Async functions using the new decorator report near-zero spans instead of their execution time. The API remains usable, but async tracing should be corrected before relying on these records. Sequence Diagram(s)sequenceDiagram
participant Caller
participant simpler.trace
participant _task_interface
participant HostLog
Caller->>simpler.trace: Enter or call span
simpler.trace->>_task_interface: Read native monotonic time
simpler.trace->>_task_interface: Emit external host span
_task_interface->>HostLog: Write span to shared timeline
Poem
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation The PR implements the core public span API requirements from Resolution Either implement the outstanding Full details: Docstring CoverageExplanation Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 35 functions across 4 files. (4 skipped: 4 unsupported.) Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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In @.claude/rules/project-layout.md:
- Line 9: Update the simpler package row in the project layout documentation to
clarify that the transition-copy modules kernel_compiler.py,
runtime_compiler.py, toolchain.py, and elf_parser.py are excluded from the
wheel, or reference the existing exclusion rule instead of stating that every
module is shipped.
In `@python/simpler/trace.py`:
- Around line 134-141: Update the decorator around wrapper to detect async
functions and use an async wrapper that awaits function(*args, **kwargs) before
emitting the span in finally, preserving exception propagation; retain the
existing synchronous wrapper behavior for regular functions.
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.claude/rules/project-layout.mddocs/dfx/README.mddocs/dfx/host-trace.mddocs/user/reference/python-api.mdpython/bindings/task_interface.cpppython/simpler/__init__.pypython/simpler/trace.pytests/ut/py/test_trace_api.py
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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>
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@coderabbitai Both inline findings addressed; fixes folded into the single commit.
Re-verified after the fix: pyut 2143 passed, ruff/pyright/markdownlint clean. |
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The async wrapper now measures the awaited coroutine execution. The regression coverage targets the original failure mode. The packaging clarification resolves the wheel-table concern. 🐇 ✅ 🧠 Learnings usedIf you found this review helpful, would you consider giving us a shout-out on X? Thank you for using CodeRabbit! You are interacting with an AI system. |
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Summary
Implements #1794: a public Python surface for putting a caller's own phases on the host timeline. Today
_task_interface._emit_host_spanis the only way in — seven arguments, three of which (invocation_id,callable_hash,depth) are our internal correlation keys a caller can only fill with zeros, plus 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.One producer, one span, one gate is the whole surface. Three properties hold by construction, which is the reason to call this rather than the entry point underneath it:
_task_interface._monotonic_now_nsbinding exposessimpler::log::monotonic_now_ns— thesteady_clockevery host record's prefix and every C++ span already use — rather than leaving Python ontime.monotonic_ns()and relying on both mapping toCLOCK_MONOTONIC. That agreement is a platform property, not a guarantee, and it is whattest_the_span_carries_the_clock_the_native_records_are_stamped_withwould catch on a platform that broke it. The binding also measures cheaper than Python's clock here: 85 ns against 134 ns per call.ext.<producer>., sotrace.span("node.dispatch")emitsext.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.trace.enabled()isunified_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.Not a side channel. #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; the reserved namespace separates whose span it is, not which format it uses. That is why this waited for #2128 rather than landing first and claiming only that it "uses the[STRACE]family".Two things #1794's sketch asks for are deliberately absent, both because they would put a second rule beside one of the three above:
instant(). A zero-duration span would be a second event concept, anddur=0is already what our own emitting side writes for a phase that was never stamped, so a public API producing it would put two meanings on one value. A marker iswith trace.span("checkpoint"): pass, which records a real short interval.app. Deriving one fromargv[0]needs a chain of special cases — strip.py, fall back to the parent directory for__main__, substitute illegal characters, fall back again when empty — and onetrace.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 gate-closed against 8998 ns emitting. The closed-gate figure is Python's own floor rather than this path's work — an empty pure-Pythonwithblock costs 272 ns there and the gate query 166 ns — so a caller in a genuinely hot loop askstrace.enabled()once instead of opening a span per iteration. That is what the public query is for.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.This PR does not declare the record format a supported external contract; the
v=1field exists for that decision and making it is separate from offering the emitter.Testing
pytest tests/ut -m "not requires_hardware"— 2140 passed, 7 skippedimport simplerstill works with_task_interfaceunimportable (test_importing_simpler_does_not_require_the_extension)--swimlaneasexternal producer pypto/smoke_trace (pid=N)with the caller's spans nested, attributes intact, and stays out of the(pid, inv)-keyed tables — the documentedext.guarantees in both directions__enter__skip the gate reddens the closed-gate case)Fixes #1794