SPICEUnion

A C++17 simulator execution and result-reading infrastructure library for EDA-style parameter sweeps and design-space exploration. It submits batches of parameterized simulation tasks to real simulators (Spectre / Ngspice), runs them concurrently in order-preserving worker pools, and returns structured results through one unified model.

中文版见下文。Simplified-Chinese readers can jump to the Chinese section below.

What problem does it solve?

Circuit design, optimization, and parameter-scan projects usually need hundreds or thousands of simulations: change parameters -> run simulator -> read results -> repeat. Doing that by hand (shell scripts, ad-hoc parsing) is slow and brittle. SPICEUnion packages this loop as an embeddable library:

submit a batch of parameter states (ParameterState) or user cases (SimulationCase);
the library starts / reuses real simulators, executes concurrently, and returns results in input order;
each task's .raw outputs stay in its own worker directory, and a unified reader turns them into typed results;
a single task failure, timeout, or simulator crash does not poison the rest of the batch.

User-facing main path:

Simulation
  -> declare parameters
  -> run SimulationCase batch
  -> SimulationResult
  -> read signals

Internal execution path:

ParameterState batch
  -> Evaluator
  -> ordered worker pool
  -> SimulatorSession
  -> worker work directory
  -> caller-owned result reading
  -> ordered TaskResult list

Feature highlights

Execution

user workflow facade (Simulation / SimulationResult) that hides worker and result-directory plumbing;
Evaluator batch facade with per-task failure isolation and ordered return;
Spectre interactive backend (SKILL handshake, parameter injection, (sclRun "all"), completion detection);
Ngspice batch backend with built-in RC AC / RC TRAN / resistor-divider DC tasks.
simulator discovery and diagnostics: find_simulator() honors SPICEUNION_SPECTRE / SPICEUNION_NGSPICE; a manual spiceunion doctor reports which simulators are available.

Results

one unified ResultIR: ScalarResult, DcSweep, AcResponse, AcDerivedView, TranWaveform;
PSF result directory discovery and reading driven by an execution-declared ResultFormat; PSFASCII is parsed by the built-in parser, BINPSF by the optional libpsf backend, and content sniffing is only a fallback for unknown formats;
Ngspice wrdata AC / TRAN / DC sweep parsing;
AC math helpers (magnitude/phase, UGBW, phase margin) and transient settling-time helper.

Language bindings

C++17 public API under include/su/;
optional pybind11 Python bindings (workflow + result helpers + result types), module name spiceunion;
C ABI: draft / deferred.

Repository layout

include/su/      public C++ API
src/workflow/    user workflow facade implementation
src/core/        evaluator and shared execution types
src/pool/        ordered worker-pool adapter
src/session/     Spectre / Ngspice session backends
src/parse/       ResultIR helpers and optional libpsf backend
src/toolchain/   simulator discovery / version probing
bindings/python/ optional pybind11 bindings
tests/           GoogleTest suites and fixtures
doc/             development docs and study notes (mostly Simplified Chinese)
local/           local run outputs / external build products (not versioned)
build/           CMake build products (not versioned)
third_party/     vendored build recipes for third-party dependencies
packaging/       wheel / conda-forge release materials
.github/         GitHub Actions pipelines (cloud CI + self-hosted CI)

Quick start

Prerequisites

a C++17 compiler;
CMake >= 3.20;
git;
OrderedConcurrentPool cloned as a sibling of this repository (MIT).

The default build needs no EDA tools, no license, and no PDK.

Build and run the default test suite

git clone https://github.com/Snappersontheprowl/SPICEUnion.git
git clone https://github.com/Snappersontheprowl/OrderedConcurrentPool.git
cd SPICEUnion
cmake --preset default
cmake --build --preset default
ctest --preset default --output-on-failure

If the pool repository lives elsewhere, pass -DSPICEUNION_ORDERED_POOL_SOURCE_DIR=/path/to/OrderedConcurrentPool.

Optional presets

Preset	Purpose
`default`	default tests, no external EDA tools
`external`	real Spectre / Ngspice external tests
`libpsf`	enable the libpsf PSF result backend
`external-libpsf`	real-netlist end-to-end: external sim + libpsf parsing
`python`	pybind11 Python bindings
`python-libpsf-pic`	Python bindings + libpsf (PIC static link)

External-simulation presets are opt-in: they require your own licensed simulator and private netlist / PDK materials. No proprietary materials are bundled or referenced by this repository.

Python quick check (after building the `python` preset)

PYTHONPATH=build/python/bindings/python python3 -c "import spiceunion; print(spiceunion.version())"

More examples live in bindings/python/examples/.

Python users: 3-minute start

No C++/CMake needed. From a fresh environment:

# install the library only (a simulator is never installed by SPICEUnion)
pip install git+https://github.com/Snappersontheprowl/SPICEUnion.git

# check what this machine can run
spiceunion doctor

import spiceunion as su

with su.Simulation(netlist_path="input.scs", simulator="spectre", workers=4) as sim:
    sim.add_parameter("wp")
    results = sim.run([{"wp": 14e-6}])
    if results[0].ok():
        ac = results[0].read_ac("out")

Reading existing result files needs no simulator at all; see bindings/python/examples/. Real simulation additionally requires your own ngspice / Spectre installation — spiceunion doctor tells you if it is missing and how to provide it.

Documentation

Most project documentation is Simplified Chinese; the doc map and conventions start at doc/develop_doc/README.md:

00_项目总览/01_当前事实状态.md — current capability, verification results, and boundary ledger (the single source of truth);
00_项目总览/02_架构总览.md — layered architecture and execution/reading pipelines;
00_项目总览/03_开发路线图.md — what is next;
10_阶段记录/ — per-milestone design background (M1–M6);
20_专题记录/ — cross-milestone design topics.
doc/develop_doc/DEVELOP_GUIDE.md — how documentation should participate in a feature development (Simplified Chinese).

Boundaries and known limitations

not a circuit metric/objective/penalty engine, optimizer, PDK manager, GUI, or full netlist IR;
SPICEUnion does not install, download, or manage real simulators (Spectre / Ngspice). It only detects executables already present on the machine (SPICEUNION_SPECTRE / SPICEUNION_NGSPICE or PATH) and calls them; when missing, spiceunion doctor tells the user how to provide one themselves.
parsing boundaries verified against real netlists: PSFXL transient returns unsupported_format; PSFASCII is supported by the built-in parser; BINPSF is supported through optional libpsf; legacy sensitivity and a fully native BINPSF parser are not implemented;
Python bindings currently cover workflow + result reading; starting simulations from Python is supported through Simulation;
no wheel / package release yet; performance numbers are not yet systematically measured.

Contributing

Contributions are welcome. Please start with CONTRIBUTING.md, which points to:

code and collaboration conventions in AGENTS.md;
the documentation map and the single source of truth for facts;
the local verification gate: scripts/verify_all_presets.sh;
cloud CI and self-hosted CI pipelines under .github/workflows/.

By contributing, you agree that your contributions are licensed under Apache-2.0.

License

SPICEUnion itself is licensed under Apache-2.0. Third-party components are used under their own licenses:

Component	Use	License
henjo/libpsf	optional BINPSF result backend	LGPL-3.0 (built from source; not distributed with this repo)
pybind11	optional Python bindings	MIT (fetched at build time)
GoogleTest	test framework	BSD-3-Clause (fetched at build time)
OrderedConcurrentPool	sibling dependency	MIT (see its `LICENSE`)

third_party/libpsf/CMakeLists.txt is this project's own CMake recipe for the upstream libpsf and is released under Apache-2.0.

中文版（Chinese）

项目是什么

SPICEUnion 是一个 C++17 的仿真器执行与结果读取基础设施库：把一批参数化仿真任务交给真实仿真器（Spectre / Ngspice）批量执行，并把结果统一读取成结构化数据，供上层算法、优化器或工具链直接使用。它把“改参数 → 跑仿真 → 读结果”的重复劳动抽象为可嵌入的库，支持并发执行、按输入顺序返回结果、单任务失败隔离。

普通用户主链路：Simulation → 声明参数 → 提交 SimulationCase batch → SimulationResult → 读取信号。

核心能力

执行层：用户工作流 facade（Simulation/SimulationResult）； Evaluator batch facade；Spectre interactive backend（SKILL handshake、参数写入、(sclRun "all")、完成判定）；Ngspice batch backend；工具链探测（SPICEUNION_SPECTRE / SPICEUNION_NGSPICE 自动发现 + 版本解析）。
结果层：统一 ResultIR；产物格式由执行层声明交付（ResultFormat）， PSFASCII 内置解析、BINPSF 走可选 libpsf；AC 数学 helper 与 settling time。
多语言：C++17 公开 API（include/su/）；可选 pybind11 Python 绑定（Simulation 工作流 + 结果读取）；C ABI 暂缓。

快速开始

默认构建不需要任何 EDA 工具 / license / PDK。前置：C++17 编译器、CMake 3.20+，以及 sibling 仓库 OrderedConcurrentPool （MIT）。

git clone https://github.com/Snappersontheprowl/SPICEUnion.git
git clone https://github.com/Snappersontheprowl/OrderedConcurrentPool.git
cd SPICEUnion
cmake --preset default
cmake --build --preset default
ctest --preset default --output-on-failure

预设一览：default（无外部 EDA）、external（真实外部仿真）、libpsf、 external-libpsf（真实网表端到端）、python、python-libpsf-pic。真实仿真预设需要你自己的 simulator 许可与私有网表 / PDK 材料，仓库不捆绑也不引用任何私有材料。

文档入口

doc/develop_doc/README.md：开发文档地图与维护规范；
doc/develop_doc/DEVELOP_GUIDE.md：一次功能开发的文档参与流程使用指导；
00_项目总览/01_当前事实状态.md：当前能力、验证数字与边界总账（事实唯一来源）；
00_项目总览/02_架构总览.md：分层架构与执行/读取链路；
00_项目总览/03_开发路线图.md：下一步施工；
10_阶段记录/：M1–M6 阶段背景；20_专题记录/：跨阶段专题。

边界与不足

不做 metric/objective/penalty、optimizer、PDK 内容管理、GUI、完整 netlist IR；
SPICEUnion 不负责安装/下载/管理真实仿真器（Spectre / Ngspice）：只探测机器上已存在的可执行文件（SPICEUNION_SPECTRE / SPICEUNION_NGSPICE 或 PATH）并调用；缺失时 spiceunion doctor 提示用户自行安装；
解析边界（真实网表实测）：PSFXL transient 明确返回 unsupported_format； PSFASCII 内置支持、BINPSF 走可选 libpsf；legacy sensitivity 与完整原生 BINPSF parser 未实现；
Python 已支持第一版 workflow binding；真实 simulator smoke 需显式开启；
尚未发布 wheel / package；性能数字未系统实测。

参与贡献

欢迎任何形式的参与，请先读 CONTRIBUTING.md：里面有协作约定（AGENTS.md）、文档地图、本地门禁 scripts/verify_all_presets.sh 与 CI 说明。提交即表示你的贡献按 Apache-2.0 授权。

许可证

本体采用 Apache-2.0（见 LICENSE）。第三方组件按各自许可使用： libpsf（LGPL-3.0，构建期以源形式获取）、pybind11（MIT）、GoogleTest （BSD-3-Clause）、OrderedConcurrentPool（MIT）。third_party/libpsf/ 下的 CMake 配方是本项目为上游 libpsf 编写的构建配方，随本项目以 Apache-2.0 发布。

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This release

0.1.0 This release

Sep 4, 2026 9 files

spiceunion 0.1.0

SPICEUnion

What problem does it solve?

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Quick start

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Build and run the default test suite

Optional presets

Python quick check (after building the python preset)

Python users: 3-minute start

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中文版（Chinese）

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Python quick check (after building the `python` preset)