From 0ff137c2125b79f9128d3c7e4dd3dd54cf46a2ad Mon Sep 17 00:00:00 2001
From: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>
Date: Sat, 12 Sep 2026 00:32:06 -0400
Subject: [PATCH] Add AirspeedVelocity benchmarking CI

Adds a benchmark workflow (Julia 1 and lts) and a benchmark/benchmarks.jl
suite covering representative workloads so PRs check for performance
regressions.

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Agent-Harness: devin 3000.10.21
Agent-Model: SWE-2 Max
Agent-Session: local session transcript /home/crackauc/.local/share/devin/cli/summaries/history_ccb52064e6514b21.md
---
 .github/workflows/benchmark.yml | 29 +++++++++++++++++++++++++++++
 benchmark/benchmarks.jl         | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 .github/workflows/benchmark.yml
 create mode 100644 benchmark/benchmarks.jl

diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
new file mode 100644
index 00000000..fcb99013
--- /dev/null
+++ b/.github/workflows/benchmark.yml
@@ -0,0 +1,29 @@
+name: Benchmark this PR
+
+on:
+  pull_request:
+    branches: [main]
+    paths-ignore: ['docs/**']
+
+permissions:
+  pull-requests: write
+  contents: read
+
+jobs:
+  benchmark:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ["1", "lts"]
+    env:
+      # Force consistent Julia depot path for self-hosted runners
+      JULIA_DEPOT_PATH: ~/.julia
+    steps:
+      - uses: MilesCranmer/AirspeedVelocity.jl@action-v1
+        with:
+          julia-version: ${{ matrix.version }}
+          script: "benchmark/benchmarks.jl"
+          extra-pkgs: "ModelingToolkit"
+          job-summary: true
diff --git a/benchmark/benchmarks.jl b/benchmark/benchmarks.jl
new file mode 100644
index 00000000..5863a8e1
--- /dev/null
+++ b/benchmark/benchmarks.jl
@@ -0,0 +1,32 @@
+using ModelOrderReduction, BenchmarkTools
+using ModelingToolkit
+
+const SUITE = BenchmarkGroup()
+
+@independent_variables t
+@variables u(t)[1:4]
+D = Differential(t)
+snapshot = [
+    sin(0.3 * i * j) + cos(0.2 * i * (j + 1)) for i in 1:4, j in 1:8
+]
+
+@mtkcompile sys = System([D(u) ~ -u - u .^ 3], t)
+csys = complete(sys)
+
+# =============================================================================
+# DEIM reduction (symbolic system + snapshot matrix)
+# =============================================================================
+
+SUITE["deim"] = BenchmarkGroup()
+
+SUITE["deim"]["deim_2"] = @benchmarkable deim($csys, $snapshot, 2)
+SUITE["deim"]["deim_3"] = @benchmarkable deim($csys, $snapshot, 3)
+
+# =============================================================================
+# POD-Galerkin reduction
+# =============================================================================
+
+SUITE["pod"] = BenchmarkGroup()
+
+SUITE["pod"]["pod_2"] = @benchmarkable pod($csys, $snapshot, 2)
+SUITE["pod"]["pod_3"] = @benchmarkable pod($csys, $snapshot, 3)