From c2a03ab37af3d0aee85ff502616cdbe8df4860eb Mon Sep 17 00:00:00 2001
From: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>
Date: Fri, 11 Sep 2026 11:45:09 -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 (611c1cba)
Agent-Model: SWE-2 High
Agent-Session: local session transcript /home/crackauc/sandbox/tmp_20260911_112052_59120/history_6a789c0b69c64ca3.md
---
 .github/workflows/benchmark.yml | 29 ++++++++++++++++++
 benchmark/benchmarks.jl         | 52 +++++++++++++++++++++++++++++++++
 2 files changed, 81 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 0000000..bb1f281
--- /dev/null
+++ b/.github/workflows/benchmark.yml
@@ -0,0 +1,29 @@
+name: Benchmark this PR
+
+on:
+  pull_request:
+    branches: [master]
+    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: ${{ matrix.version }}
+          script: "benchmark/benchmarks.jl"
+          extra-pkgs: "DiffEqBase"
+          job-summary: true
diff --git a/benchmark/benchmarks.jl b/benchmark/benchmarks.jl
new file mode 100644
index 0000000..3575248
--- /dev/null
+++ b/benchmark/benchmarks.jl
@@ -0,0 +1,52 @@
+using DiffEqNoiseProcess, DiffEqBase, BenchmarkTools
+
+const SUITE = BenchmarkGroup()
+
+# =============================================================================
+# Noise process simulation
+# =============================================================================
+
+SUITE["simulate"] = BenchmarkGroup()
+
+W_scalar = WienerProcess(0.0, 0.0, 0.0)
+prob_w = NoiseProblem(W_scalar, (0.0, 1.0); seed = 1234)
+
+W_vec = WienerProcess!(0.0, zeros(10), zeros(10))
+prob_wv = NoiseProblem(W_vec, (0.0, 1.0); seed = 1234)
+
+gbm = GeometricBrownianMotionProcess(0.01, 0.2, 0.0, 1.0, 1.0)
+prob_gbm = NoiseProblem(gbm, (0.0, 1.0); seed = 1234)
+
+ou = OrnsteinUhlenbeckProcess(1.0, 0.0, 0.5, 0.0, 0.0)
+prob_ou = NoiseProblem(ou, (0.0, 1.0); seed = 1234)
+
+SUITE["simulate"]["wiener_scalar"] = @benchmarkable solve($prob_w; dt = 0.001)
+SUITE["simulate"]["wiener_vector"] = @benchmarkable solve($prob_wv; dt = 0.001)
+SUITE["simulate"]["geometric_brownian"] = @benchmarkable solve($prob_gbm; dt = 0.001)
+SUITE["simulate"]["ornstein_uhlenbeck"] = @benchmarkable solve($prob_ou; dt = 0.001)
+
+# =============================================================================
+# Bridge processes
+# =============================================================================
+
+SUITE["bridge"] = BenchmarkGroup()
+
+Wb = BrownianBridge(0.0, 1.0, 0.0, 1.0)
+prob_wb = NoiseProblem(Wb, (0.0, 1.0); seed = 1234)
+
+gbmb = GeometricBrownianBridge(0.01, 0.2, 0.0, 1.0, 1.0, 1.5)
+prob_gbmb = NoiseProblem(gbmb, (0.0, 1.0); seed = 1234)
+
+SUITE["bridge"]["brownian"] = @benchmarkable solve($prob_wb; dt = 0.001)
+SUITE["bridge"]["geometric_brownian"] = @benchmarkable solve($prob_gbmb; dt = 0.001)
+
+# =============================================================================
+# Ensemble simulation
+# =============================================================================
+
+SUITE["ensemble"] = BenchmarkGroup()
+
+eprob = EnsembleProblem(prob_w)
+SUITE["ensemble"]["trajectories_100"] = @benchmarkable solve(
+    $eprob; dt = 0.01, trajectories = 100
+)