pulsim 0.3.3

High-performance circuit simulator for power electronics

PulsimCore

High-performance power-electronics simulation with a Python-first runtime.

Supported Product Surface

Pulsim is now Python-only for user-facing usage:

• Supported: import pulsim APIs and YAML netlist workflows.
• Not supported as product surface: legacy CLI, gRPC server/client docs, JSON netlist loading.
• Core execution engine: unified v1 kernel.

See:

• docs/user-guide.md
• docs/migration-guide.md
• openspec/changes/refactor-python-only-v1-hardening/tasks.md

Quick Start

1) Build local Python bindings

cmake -S . -B build -G Ninja \
  -DCMAKE_BUILD_TYPE=Release \
  -DPULSIM_BUILD_PYTHON=ON
cmake --build build -j

2) Run with Python package from local build

PYTHONPATH=build/python python3 - <<'PY'
import pulsim as ps

parser_opts = ps.YamlParserOptions()
parser = ps.YamlParser(parser_opts)
circuit, sim_opts = parser.load("benchmarks/circuits/rc_step.yaml")

sim_opts.newton_options.num_nodes = int(circuit.num_nodes())
sim_opts.newton_options.num_branches = int(circuit.num_branches())

sim = ps.Simulator(circuit, sim_opts)
result = sim.run_transient(circuit.initial_state())
print("success:", result.success, "steps:", result.total_steps)
PY

Benchmarks and Validation

# Benchmark matrix (Python runtime path)
PYTHONPATH=build/python python3 benchmarks/validation_matrix.py --output-dir benchmarks/matrix

# External parity (ngspice)
PYTHONPATH=build/python python3 benchmarks/benchmark_ngspice.py \
  --backend ngspice \
  --output-dir benchmarks/ngspice_out

# External parity (LTspice, explicit executable path required)
PYTHONPATH=build/python python3 benchmarks/benchmark_ngspice.py \
  --backend ltspice \
  --ltspice-exe "/Applications/LTspice.app/Contents/MacOS/LTspice" \
  --output-dir benchmarks/ltspice_out

# Tiered stress suite (A/B/C)
PYTHONPATH=build/python python3 benchmarks/stress_suite.py --output-dir benchmarks/stress_out

Documentation Site

Build docs locally:

python3 -m pip install -r docs/requirements.txt
mkdocs build --strict

Serve locally:

mkdocs serve

Versioned deploy:

• Workflow: .github/workflows/docs.yml
• Trigger: only when pushing version tags v* (example: v0.2.1)
• Deploy mode: mike on gh-pages branch with version selector enabled
• Old versions remain published and selectable in the docs UI

Notes

• YAML schema is pulsim-v1.
• Benchmark/parity artifacts are machine-readable (results.json, parity_results.json, stress_results.json).
• For migration details (removed APIs and timeline), see docs/migration-guide.md.