test(st): L3 dispatch runs the callable it names - #1938
Conversation
The existing coverage for serving several callables on one L3 worker cannot
observe a dispatch that ran the wrong one. dynamic_register builds its two
callables from the same orchestration, differing only by an unused child entry
at func_id 99, so both compute the same value -- a dispatch that ran the other
callable produces exactly the value that test asserts.
These cases build two callables that compute DIFFERENT functions, by exchanging
the AIV binaries at func_id 0 and 2. kernel_add and kernel_mul share an argument
layout, so the exchange is signature-safe:
X func0=add, func2=mul -> f = (a+b+1) * (a+b+2) + (a+b)
Y func0=mul, func2=add -> c = a*b ; f = ((c+1) + (c+2)) * c
Sequences on one worker: X, X X, X Y, X Y X, and X Y X Y X Y -- the fourth being
a callable re-dispatched after another has run. A fresh-worker-per-dispatch case
gives a baseline, so an environmental failure is distinguishable from a reuse
defect. On a mismatch the check compares against the other callable's expected
value first, so the report names the culprit rather than a bare numeric
difference. Every dispatch uses its own input values, so a stale buffer cannot
pass as a correct result.
test_the_two_callables_are_distinguishable runs no kernel: it asserts X and Y
disagree on every input pair used, and that each failure message fires. Without
it, making X and Y compute the same value would silently empty the other cases.
Verified 6/6 on a2a3sim and 6/6 on a2a3 hardware. Fault-injected end to end --
submitting the other callable's handle on the third dispatch of X Y X while
checking against the named one -- and the suite fails with
dispatch 2:X named callable X but produced callable Y's result (39.375);
expected 34
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📝 WalkthroughWalkthroughThis change adds L3 tests for two ChangesCallable isolation tests
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The change improves callable-dispatch coverage, but setup failures may leave worker resources uncleared and affect later test runs. The PR is mergeable with owner awareness and a follow-up to close workers across the full setup boundary. Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@tests/st/a2a3/tensormap_and_ringbuffer/test_l3_callable_isolation.py`:
- Around line 180-191: In both affected test sites at
tests/st/a2a3/tensormap_and_ringbuffer/test_l3_callable_isolation.py lines
180-191 and 217-224, begin the existing try block immediately after Worker
construction and include register(), _build_l3_task_args(), and worker.init()
within it. Ensure the corresponding finally path calls worker.close(), including
when Worker.init() fails, so cleanup can be retried.
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tests/st/a2a3/tensormap_and_ringbuffer/test_l3_callable_isolation.py
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Both cases opened their try/finally after Worker.init(), so a register(),
_build_l3_task_args() or init() that raised skipped worker.close(). init()
rolls back best-effort and may leave a child behind, marks the worker FAILED
("close this Worker and create a new one"), and close() is what re-drives the
journaled teardown debt -- as its own docstring says, "a worker that is never
closed keeps its device held". Skipping it turns one failed case into every
later case on that card failing.
Guard from construction instead. Verified on a2a3sim that close() returns
cleanly both on a never-init'd worker and on one whose init was fault-injected
to fail after the chip child was forked, so the wider finally cannot mask the
original error. All 7 cases pass on a2a3sim and on a2a3 device 0.
1 participant
The gap
The existing coverage for serving several callables on one L3 worker cannot observe a dispatch that ran the wrong one.
tests/st/a2a3/tensormap_and_ringbuffer/dynamic_register/test_dynamic_register.pybuilds both of its callables from the same orchestration via_build_vector_callable, differing only by an unused child entry atfunc_id99. Both therefore compute the same value, and the test says so as an intent:So a dispatch that ran the other callable produces exactly the value that test asserts. The failure mode it is positioned to catch is the one failure mode it cannot see.
This is not hypothetical. On runtime
a756969ca chip child bound to the first callable it ran, and a later dispatch of a different callable silently returned wrong data — observed downstream as three correct gradients and one atmax_rel = 1.0, the one output fed by a re-dispatched kernel. That behaviour is correct on current main; two refactors between (39f5cdd9,da75d350) appear to have fixed it. Because no test named the behaviour, nothing reported the fix either, and a workaround built on the constraint outlived it by three weeks.What this adds
Two callables that compute different functions, built by exchanging the AIV binaries at
func_id0 and 2.kernel_addandkernel_mulshare an argument layout, so the exchange is signature-safe:Distinct binaries per
func_idgive distinct hashids and distinct expected values.Sequences on one worker:
X,X X,X Y,X Y X,X Y X Y X Y. The fourth is a callable re-dispatched after another has run. A fresh-worker-per-dispatch case is included as a baseline, so an environmental failure stays distinguishable from a reuse defect.On a mismatch the check compares against the other callable's expected value first, so the report names the culprit instead of a bare numeric difference:
test_the_two_callables_are_distinguishableruns no kernel. It asserts X and Y disagree on every input pair used, and that each of the failure messages fires. Without it, making X and Y compute the same value would silently empty every other case — which is the failure this PR is about.Every dispatch uses its own input values, so a stale-buffer read cannot pass as a correct result. All callables are registered and all argument buffers allocated before
init(), per the fork-inheritance contract.Verification
a2a3sim, 6/6 ona2a3hardware (single device, no collectives).X Y Xwhile still checking against the named one makes the suite fail with the message above. The same injection throughtest_dynamic_register.pypasses, because its two callables agree.A question about the
manualmarkersFour of the five
dynamic_registercases carry@pytest.mark.manual(["a2a3sim"]), and--manualdefaults toexclude, so they do not run in ordinary lanes. Was that a deliberate quarantine — cost, flakiness, device pressure — or incidental? It affects where this file belongs: if there is a reason multi-callable cases are kept out of the default lanes, these should probably follow the same convention rather than run by default. Happy to mark them to match; they are currently unmarked and run ona2a3simanda2a3.