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Fix Rosenbrock convergence-order test flakiness (Rodas6P dts + Rodas5P+Krylov tol) #3528

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ChrisRackauckas merged 2 commits into from
Apr 23, 2026
+9 −4
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Fix Rosenbrock convergence-order test flakiness (Rodas6P dts + Rodas5P+Krylov tol) #3528

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cab06ff
Fix Rosenbrock test roundoff / Krylov tolerance issues
ChrisRackauckas Apr 23, 2026
5da9045
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ChrisRackauckas Apr 23, 2026
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16 changes: 12 additions & 4 deletions lib/OrdinaryDiffEqRosenbrock/test/ode_rosenbrock_tests.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -207,7 +207,11 @@ end

prob = prob_ode_linear

sim = test_convergence(dts, prob, Rodas6P(), dense_errors = true)
# Use larger dts than the default (1/2).^(6:-1:3): the linear test problem
# is so small that Rodas6P (order 6) hits Float64 roundoff at dt=1/64,
# corrupting the measured convergence slope.
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rodas6p_dts = (1 / 2) .^ (5:-1:2)
sim = test_convergence(rodas6p_dts, prob, Rodas6P(), dense_errors = true)
#@test sim.𝒪est[:final]≈5 atol=testTol #-- observed order > 6
@test sim.𝒪est[:L2] ≈ 6 atol = testTol

Expand All @@ -217,7 +221,7 @@ end

prob = prob_ode_2Dlinear

sim = test_convergence(dts, prob, Rodas6P(), dense_errors = true)
sim = test_convergence(rodas6p_dts, prob, Rodas6P(), dense_errors = true)
#@test sim.𝒪est[:final]≈5 atol=testTol #-- observed order > 6
@test sim.𝒪est[:L2] ≈ 6 atol = testTol

Expand Down Expand Up @@ -256,6 +260,8 @@ end
#@test sim.𝒪est[:final]≈5 atol=testTol #-- observed order > 6
@test sim.𝒪est[:L2] ≈ 5 atol = testTol

# Krylov linear solvers need tight tolerance for the outer-method
# convergence order to surface; LinearSolve now respects reltol/abstol.
sim = test_convergence(
dts, prob,
Rodas5P(
Expand All @@ -264,7 +270,8 @@ end
),
linsolve = LinearSolve.KrylovJL()
),
dense_errors = true
dense_errors = true,
reltol = 1.0e-14, abstol = 1.0e-14
)
#@test sim.𝒪est[:final]≈5 atol=testTol #-- observed order > 6
@test sim.𝒪est[:L2] ≈ 5 atol = testTol
Expand All @@ -277,7 +284,8 @@ end
),
linsolve = LinearSolve.KrylovJL_GMRES()
),
dense_errors = true
dense_errors = true,
reltol = 1.0e-14, abstol = 1.0e-14
)
#@test sim.𝒪est[:final]≈5 atol=testTol #-- observed order > 6
@test sim.𝒪est[:L2] ≈ 5 atol = testTol
Expand Down
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