wai-quantum: the estimate job on the reaction-limited clock, one tick rule shared with quantum_arch, the step clock's answers and receipts unchanged #673
2026-11-08
Merge origin/main into the branch
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum: the landscape's WebGPU members come from one instance, so a card is found every time
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With the CUDA fault fixed, jetson-hub's leg still lost a member: the RTX 4050 through Vulkan, from the fourth fault on. The disk was not the cause. The leg compiled and wrote its files, and the same tests failed twice more with 248 GB free. Nor was the card's memory: at most 630 of 6,141 MiB was in use. Each discovery made its own wgpu instance. That host's NVIDIA Vulkan driver (595.99) lists its card to a process's first ten instances and not after, even with every one dropped. At that moment it logs NV_ERR_NO_MEMORY for a host-memory allocation. A process that looks again, as the device tests do for every test and every faulted kernel, found the card gone; the order of the tests only decided where. On jetson-hub, one process discovering 60 times: - an instance a discovery: the card is found 10 times, then not again; - one instance for the process: the card is found 60 times. Discovery now takes the process's one instance. a_member_is_found_however_often_the_host_looks discovers twelve times in one process and wants the same members each time. On the Framework (AMD, through Vulkan) and Thor (NVIDIA), the device tests, it among them, pass twice each. The workflow expects 9 device tests where it expected 8. Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-11-07
Merge origin/main (wai-quantum 0.9.0) into the branch
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum: a CUDA sampling kernel that looks past its table stops, and the device stays
The jetson-hub leg's reds were not the card. The kernel log there holds Xid 31 (an MMU fault: a kernel read an unmapped address) many times today, the same address each time. They come from the process running the device tests, and none is a hardware Xid. The same tests on Thor's GPU, another card and driver, gave the same fault. The fault test puts "fields held in 32 bits" into the CUDA kernels. The sampling kernel shares field_of, so a wrong field sent its table lookup far past the table. On CUDA nothing checks that index, so the read faulted. A fault is sticky, and the process's primary context was lost: - the next fault's kernels "opened on 0 devices"; - every later CUDA test found "CUDA_ERROR_ILLEGAL_ADDRESS". WebGPU's kernels survive the same port because their indices are bounds-checked. The Xid named the decline test's thread because that test first made the context and its channel. chains_in_order now takes the table's entry count and a fault word. A lookup at or past the end sets the word and stops, and the host returns an error. The host sizes the table to every field a cell can reach, so the kernels as written never do this. A port that gets a field wrong loses its grade (certify takes an error as not holding) and not the device. a_kernel_that_looks_past_its_table_loses_its_grade_and_not_the_device puts a lookup 2^40 entries past the table into the CUDA kernel (and 256 MB past it into WebGPU's). It requires the grade lost, and the clean kernels to open again on as many devices and certify bit-exact. - With the check switched off it fails on Thor: "the clean kernels opened on 0 devices, before it on 1", with a new Xid 31. - With the check on, the device tests pass twice with no Xid, and compute-sanitizer's memcheck finds 0 errors in the fault tests. The workflow expects 8 device tests where it expected 7. Co-Authored-By: Claude Opus 5.5 <[email protected]>
Merge origin/main into the branch
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum: the reaction clock, as its review asked
What the source says. - arXiv:1905.09749 §2.11's "approximately 7 hours" is not a serial figure. Its 37 ms a lookup addition is the parallel basis of the paper's 5.1 hours: the lookup at half a beat an entry, and one runway piece's addition with the pieces side by side. It reaches 7 by rounding. Eq. (1)'s 503,808 lookup additions become 0.1·n_e·n, then 3.7·n_e·n ms becomes 4·n_e·n, which is 6.99 hours; unrounded, 37 ms gives 5.18. - The paper prints no serial figure. Its equations, at 10 µs a Toffoli one after another, give 7.3 hours (5,207 Toffolis a lookup addition), and the row, the page and the change note give that as our derivation. - The job's 20.05 M qubits are at d = 25 (a new row). They are near the paper's 20 M only by chance. - Of FeMoCo's 157 T factories against four, the tick is ×3.8 and the kind of factory ×10. At the paper's 38.75 µs the job keeps 41 15-to-1 units, each 1,568 µs to a CCZ state against its 155. What the engine takes. - A reaction includes the logical measurement it reacts to (App. B.1). A reaction time shorter than the qubit's measurement is refused (QE08), and the 100 µs qubits have no 10 µs tick. - `--qubit all` lists such a qubit as refused, with the reason, beside the others. - A machine whose qubits pass 64 bits is refused (checked arithmetic; ceil_pos saturates), where it once wrapped into a signed receipt. - The tool's schema and estimate.v1.json give the clock the engine's bounds: below 10⁹ µs, and no other member. The refusal message says so. - The answer echoes the reaction time as the request wrote it, since t·10³/10³ is not always t. What a reader sees. - A reaction-clock receipt names its clock: `tick_time_ns` and a `clock` member, read from the figures it signs. A step-clock receipt is byte-identical to before. from_json refuses a `clock` member that disagrees with the figures, and compares bits, since the crate's JSON parser need not round floats back. - `wai-quantum verify` prints the clock, and so do the estimate report and its `--qubit all` table. - `Estimate::steps` says what it counts on the reaction clock. - The README row, the request lists and the tool's description name the clock. Tidying. - The Rounding bullet is back under Honest boundaries. - The clock test has its own doc comment, and the summary-rows test has its comment back. New tests, each failing on the code before it, with the CLI's and the schema check's new calls: - a_reaction_time_is_never_shorter_than_the_qubit_s_measurement - a_machine_past_sixty_four_bits_is_refused_and_not_wrapped - a_reaction_clock_receipt_names_its_clock_and_a_step_clock_receipt_is_unchanged - a_reaction_time_shorter_than_a_measurement_is_refused - the_answer_echoes_the_reaction_time_as_written - the_schemas_say_of_the_clock_what_the_engine_takes - section_2_11_is_the_parallel_basis_rounded_and_the_serial_figure_is_ours - the_reaction_rows_say_what_they_rest_on - the_reaction_clock_reaches_the_request_and_the_report_names_it The existing clock test now counts four reaction runs where it allowed six or more: the 100 µs qubit's are refused. Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-11-06
merge the guard fix from #665
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum: the estimate job on the reaction-limited clock
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The estimate job priced arXiv:1905.09749's 2048-bit factoring at 60.7
hours against the paper's 5.1: every Toffoli took three logical steps,
and only quantum_arch had the reaction-limited clock. The job now takes
it: "clock": {"reaction_us": t} in a request, --reaction-us t on the
command line, reaction_us= in Python, and the estimate_resources tool on
both MCP servers.
One rule: quantum_resource::reaction_tick(reaction, supply), the slower
of the two, is the tick. quantum_arch::Timing::tick_us calls it
(quantum_arch now enables quantum_resource), and Clock::Reaction takes
it. On that clock estimate_isa_clocked takes the Toffolis' 3X steps out
and adds X ticks to the runtime, every Toffoli after the one before as
the layout runs its steps; holds the tiles' error over the whole
runtime; keeps enough factories that a CCZ state (four T states) comes
every tick, so the tick is the reaction time; and stretches ticks with
steps when slowed.
What the spec and receipts pin stays:
- Without a clock, or "clock": "steps", the answer and its receipts are
what they were, bit for bit: estimate_isa is estimate_isa_clocked on
Clock::Steps, the same arithmetic in the same order, and a clocked job
on the step clock has the job's hash and seals the same receipt.
- On the reaction clock the estimate's steps are the lattice-surgery
steps alone and its runtime adds the ticks, so the job is versioned: a
ClockedJob, whose hash is wai:resource-job-clocked\x01 over the job's
hash and the reaction time. A receipt sealed on one clock never
verifies as sealed on the other.
- wai.quantum.estimate/1 grows: an optional request member clock, and
an optional clock member in each estimate's figures (reaction_us,
tick_us, toffolis). No public struct gained a field: the clock enters
through new items only.
Through the job, arXiv:1905.09749's counts at its 10 us give 7.50 hours,
every Toffoli after the one before: the paper's own Section 2.11 estimate
on that basis is "approximately 7 hours"; its 5.1 runs its two runway
pieces side by side and its lookups at half a beat, which counts alone
do not carry. The published-architecture page carries these rows, and
the step clock's rows are now an assumption the request can change.
Tests, each failing on the code before it:
quantum_resource the_step_clock_is_the_estimate_bit_for_bit_and_the_
reaction_clock_keeps_pace; quantum_resource_receipt on_the_step_clock_
a_clocked_job_is_the_job_and_on_the_reaction_clock_another;
engine::estimate without_a_clock_the_answer_is_the_step_clock_s_and_
names_none, the_reaction_clock_runs_each_toffoli_in_a_tick_with_
factories_to_keep_up, a_reaction_clock_estimate_is_sealed_as_a_clocked_
job; and Python's test_an_estimate_on_the_reaction_clock_runs_each_
toffoli_in_a_tick. The resource-estimation workflow requires the five
Rust tests by name. The committed tool lists and agent docs are
regenerated.
Co-Authored-By: Claude Opus 5.5 <[email protected]>