Timeouts¶

SiDB timeouts use milliseconds: 2**64 - 1 (default) is unlimited; 0 expires immediately. Nested calls and workers share the enclosing deadline without extending it.

The table names C++ parameter members. Python uses the keyword timeout for these bound applications; circuit design also accepts design_gate_timeout for each gate search.

Application	C++ budget member
Gate design	`operational_params.timeout`
Circuit design, including defect-aware placement and routing	`timeout`
Operational checks and input-pattern analysis	`timeout`
Operational and critical-temperature domains, physical-validity sweeps	`operational_params.timeout`
Critical temperature, defect influence, displacement robustness and fabrication probability	`operational_params.timeout`
Operational-domain ratio	`op_domain_params.operational_params.timeout`
Population stability and time-to-solution	`timeout`
Band-bending resilience	`assess_population_stability_params.timeout`

Expiration throws fiction::utils::timeout_error in C++ or TimeoutError in Python, without publishing partial results or statistics. A completed result is returned even if the last operation or callback overruns the deadline. Circuit design aborts on a gate timeout; only a completed, unsuccessful gate search triggers defect-aware placement-and-routing retries.

Finite budgets support QuickExact, ExGS, and QuickSim. ClusterComplete rejects them with std::invalid_argument (ValueError in Python). QuickSim’s quicksim_params.timeout in C++ and quicksim_timeout in Python set a separate per-attempt limit in time-to-solution measurements.

Cancellation is cooperative: individual operations and callbacks can overrun the budget before the next check, and cleanup callbacks can run afterward. Use a separate process for a hard deadline.

C++

fiction::sidb::simulation::logic::operational_domain_params params{};
params.operational_params.timeout = 5'000;
const auto domain = fiction::sidb::simulation::logic::operational_domain_grid_search(layout, spec, params);

Python

from mnt.pyfiction.sidb.simulation.logic import operational_domain_grid_search

domain = operational_domain_grid_search(layout, spec, timeout=5_000)