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Safeguard reused FGMRES guesses against the current true residual

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This commit is contained in:
Emily Boudreaux
2026-09-16 14:49:47 -04:00
parent 21b2c2b38e
commit 61174cf192
3 changed files with 111 additions and 4 deletions
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47
tests/solver/stellar_equilibrium_runtime.cpp
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@@ -743,6 +743,53 @@ TEST_CASE(
CHECK(correction(1) == Approx(0.6).margin(1.0e-11));
}
TEST_CASE(
"MFEM FGMRES Discards A Supplied Guess That Worsens The Current True Residual",
"[solver][linear][fgmres][warm-start][safeguard]"
) {
using namespace mean_field;
using namespace stellar_solver_architecture_test;
using Catch::Approx;
TwoByTwoOperator operation;
IdentityInverse inverse;
auto backend = solver::linear::prepareLinearBackend(
solver::linear::FGMRES({.restartLength = 1, .printLevel = -1}), operation, inverse, MPI_COMM_WORLD
);
mfem::Vector rhs(2), correction(2);
rhs(0) = 1.0;
rhs(1) = 2.0;
const solver::LinearSolveControl control{
.relativeTolerance = 1.0e-12, .absoluteTolerance = 1.0e-14, .maximumIterations = 200
};
correction = 0.0;
const auto cold = backend.Solve(rhs, correction, control);
REQUIRE(cold.Converged());
int rank = 0;
REQUIRE(MPI_Comm_rank(MPI_COMM_WORLD, &rank) == MPI_SUCCESS);
correction = 0.0;
SECTION("A finite adverse guess on one rank falls back collectively") {
if (rank == 0) {
correction(0) = 100.0;
correction(1) = -100.0;
}
}
SECTION("Finite coefficients with an overflowing operator action fall back collectively") {
if (rank == 0) {
correction = std::numeric_limits<double>::max() / 2.0;
}
}
const auto guarded = backend.Solve(rhs, correction, control);
REQUIRE(guarded.Converged());
CHECK(guarded.initialResidualNorm == Approx(cold.rightHandSideNorm));
CHECK(guarded.iterations == cold.iterations);
CHECK(guarded.operatorApplications == cold.operatorApplications + 1);
CHECK(correction(0) == Approx(0.1).margin(1.0e-11));
CHECK(correction(1) == Approx(0.6).margin(1.0e-11));
CHECK(guarded.trueResidualNorm <= control.ConvergenceThreshold(guarded.rightHandSideNorm));
}
TEST_CASE(
"A User-Owned Context Certifies Views Only Through Evaluation Reports",
"[solver][architecture][ownership][report][view]"