Add distributed Ginkgo solver by greole · Pull Request #522 · exasim-project/NeoN

greole · 2026-05-23T19:41:10Z

Adds distributed (MPI) Ginkgo solver support to NeoN. The LinearSystem template is extended so the RHS value type can differ from the matrix value type, and it now carries a CommunicationPattern under MPI; Solver::solve dispatches to new solveDist overloads when a non-empty pattern is present. A new ginkgoDistributed.cpp builds a Ginkgo distributed matrix/vector from the local CSR plus the off-diagonal COO and runs scalar (and per-component Vec3) distributed solves. A SetReference post-assembly DSL functor is added to pin a reference cell so pure-Neumann systems are nonsingular, and the distributed operator test now validates the distributed solve against a global one.

Changes:

Add distributed Ginkgo matrix assembly + scalar/Vec3 solveDist paths, gated on NF_WITH_GINKGO and NF_WITH_MPI_SUPPORT.
Generalize LinearSystem with a separate RHSValueType and store/copy a CommunicationPattern; rebuild off-diagonal sparsity in createEmptyLinearSystem from the communication pattern.
Add SetReference post-assembly hook (pointer-based ps API across Expression/solver) and rework Ginkgo helpers (gkoVecView, retrieve) into the header; also add a (currently unused) StoppingCriterion/DistStoppingCriterion source file.

github-actions · 2026-05-23T19:42:55Z

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I deployed a test documentation to https://exasim-project.com/NeoN/Build_PR_522
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Copilot

Pull request overview

Adds distributed (MPI) Ginkgo solver support to NeoN. The LinearSystem template is extended so the RHS value type can differ from the matrix value type, and it now carries a CommunicationPattern under MPI; Solver::solve dispatches to new solveDist overloads when a non-empty pattern is present. A new ginkgoDistributed.cpp builds a Ginkgo distributed matrix/vector from the local CSR plus the off-diagonal COO and runs scalar (and per-component Vec3) distributed solves. A SetReference post-assembly DSL functor is added to pin a reference cell so pure-Neumann systems are nonsingular, and the distributed operator test now validates the distributed solve against a global one.

Changes:

Add distributed Ginkgo matrix assembly + scalar/Vec3 solveDist paths, gated on NF_WITH_GINKGO and NF_WITH_MPI_SUPPORT.
Generalize LinearSystem with a separate RHSValueType and store/copy a CommunicationPattern; rebuild off-diagonal sparsity in createEmptyLinearSystem from the communication pattern.
Add SetReference post-assembly hook (pointer-based ps API across Expression/solver) and rework Ginkgo helpers (gkoVecView, retrieve) into the header; also add a (currently unused) StoppingCriterion/DistStoppingCriterion source file.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
include/NeoN/linearAlgebra/ginkgo.hpp	Moves `gkoArrayView`/`gkoVecView`/`retrieve` into the header and adds `solveDist` declarations plus the scalar-matrix/Vec3-rhs overload on `GinkgoSolver`.
include/NeoN/linearAlgebra/solver.hpp	Adds default-throwing `SolverFactory` virtuals for the new overloads and dispatches scalar/Vec3 `Solver::solve` to `solveDist` when `commPattern().sendCounts` is non-empty.
include/NeoN/linearAlgebra/linearSystem.hpp	Adds `RHSValueType` template parameter, optional `CommunicationPattern` member, new convenience ctor, and rebuilds off-diagonal sparsity in `createEmptyLinearSystem` from `recvIdx`.
include/NeoN/dsl/expression.hpp	Makes `PostAssemblyBase::operator()` const, switches post-assembly list to pointer-vector, and adds the new `SetReference` functor.
include/NeoN/dsl/solver.hpp	Updates `iterativeSolveImpl`/`solve` signatures to take a pointer-vector of post-assembly hooks.
src/linearAlgebra/ginkgo/ginkgo.cpp	Generalizes `solve_impl` to be templated on vector type, drops the now-header helpers, and adds the scalar-matrix Vec3-rhs solve via segregated component solves.
src/linearAlgebra/ginkgo/ginkgoDistributed.cpp	New: distributed Ginkgo vector/matrix view builders, distributed `solve_impl_dist`, and `GinkgoSolver::solveDist` for scalar and Vec3 systems.
src/linearAlgebra/ginkgo/ginkgoL1Stop.cpp	New: defines a distributed L1-style stopping criterion class that is not wired into any solver yet.
src/finiteVolume/cellCentred/stencil/basicGeometryScheme.cpp	Reorders boundary-data fetches and uses `views(...)` (with a typo-fix from `bFaceAreas` to `bFaceArea` at the use site).
src/CMakeLists.txt	Repaths `ginkgo.cpp` under the new `ginkgo/` subdir and adds the two new distributed Ginkgo sources under `NeoN_WITH_MPI`.
test/linearAlgebra/ginkgo.cpp	Adds tests for `gkoVecView` scalar/Vec3, mutable/const overloads and a scalar-matrix multi-Vec3-rhs solve.
test/distributed/operator.cpp	Renames helpers, uses `SetReference`, switches to GMRES with 200 iters, and compares distributed final residual + per-rank solution slice against a global solve.
CHANGELOG.md	Adds PR #522 to the experimental MPI support entry.

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+class StoppingCriterion
+{
+    using vec = gko::matrix::Dense<scalar>;
+    using mtx = gko::matrix::Csr<scalar>;
+    using val_array = gko::array<scalar>;
+    using idx_array = gko::array<localIdx>;
+
+    using dist_vec = gko::experimental::distributed::Vector<scalar>;
+
+    class DistStoppingCriterion :
+        public gko::EnablePolymorphicObject<DistStoppingCriterion, gko::stop::Criterion>
+    {
+        friend class gko::EnablePolymorphicObject<DistStoppingCriterion, gko::stop::Criterion>;
+        using Criterion = gko::stop::Criterion;
+
+    public:
+
+        GKO_CREATE_FACTORY_PARAMETERS(parameters, Factory)
+        {
+            /**
+             * Boolean set by the user to stop the iteration process
+             */
+            // TODO check why GKO_FACTORY_PARAMETER_SCALAR does not work
+            scalar GKO_FACTORY_PARAMETER(absolute_tolerance, 1.0e-6);
+
+            scalar GKO_FACTORY_PARAMETER(relative_tolerance, 0.0);
+
+            localIdx GKO_FACTORY_PARAMETER(minIter, 0);
+
+            localIdx GKO_FACTORY_PARAMETER(maxIter, 0);
+
+            localIdx GKO_FACTORY_PARAMETER(frequency, 1);
+
+            std::add_pointer<localIdx>::type GKO_FACTORY_PARAMETER_SCALAR(iter, NULL);
+
+            std::add_pointer<scalar>::type GKO_FACTORY_PARAMETER_SCALAR(time, NULL);
+
+            std::add_pointer<scalar>::type GKO_FACTORY_PARAMETER_SCALAR(residual_norm, NULL);
+
+            std::shared_ptr<vec> GKO_FACTORY_PARAMETER_SCALAR(residual_norms, {});
+
+            std::add_pointer<scalar>::type GKO_FACTORY_PARAMETER_SCALAR(init_residual_norm, NULL);
+
+            localIdx GKO_FACTORY_PARAMETER(verbose, 0);
+
+            bool GKO_FACTORY_PARAMETER(export_res, false);
+
+            std::shared_ptr<const gko::LinOp> GKO_FACTORY_PARAMETER(gkomatrix, {});
+
+            std::shared_ptr<dist_vec> GKO_FACTORY_PARAMETER(x, {});
+
+            std::shared_ptr<dist_vec> GKO_FACTORY_PARAMETER(b, {});
+        };
+
+        GKO_ENABLE_CRITERION_FACTORY(DistStoppingCriterion, parameters, Factory);
+
+        GKO_ENABLE_BUILD_METHOD(Factory);
+
+        /* Compute the SpMV of A with x_ref, where x_ref is a vector containing
+         * the average of x in every row. This is needed to initialise the
+         * normfactor in the first iteration.
+         *  */
+        void compute_Axref_dist(
+            size_t global_size,
+            size_t local_size,
+            std::shared_ptr<const gko::Executor> device_exec,
+            std::shared_ptr<const gko::LinOp> gkomatrix,
+            std::shared_ptr<const dist_vec> x,
+            std::shared_ptr<dist_vec> res
+        ) const;
+
+        /* Compute the normfactor ie || Ax - x* || + || b - x* ||
+         * or rewritten as || r - ( b - x* ) || + || (b - x*) ||
+         *  */
+        scalar compute_normfactor_dist(
+            std::shared_ptr<const gko::Executor> device_exec,
+            const dist_vec* r,
+            std::shared_ptr<const gko::LinOp> gkomatrix,
+            std::shared_ptr<const dist_vec> x,
+            std::shared_ptr<const dist_vec> b
+        ) const;
+
+        /* Implementation of the residual norm check
+         *  */
+        bool check_impl(
+            gko::uint8 stoppingId,
+            bool setFinalized,
+            gko::array<gko::stopping_status>* stop_status,
+            bool* one_changed,
+            const Criterion::Updater& updater
+        ) override;
+
+
+        explicit DistStoppingCriterion(std::shared_ptr<const gko::Executor> exec)
+            : EnablePolymorphicObject<DistStoppingCriterion, Criterion>(std::move(exec))
+        {}
+
+        explicit DistStoppingCriterion(const Factory* factory, const gko::stop::CriterionArgs&)
+
+            : EnablePolymorphicObject<DistStoppingCriterion, Criterion>(factory->get_executor()),
+              parameters_ {factory->get_parameters()}
+        {}
+
+        void set_eval_norm_factor(bool eval_norm_factor) { eval_norm_factor_ = eval_norm_factor; }
+
+        mutable bool first_iter_ = true;
+
+        mutable scalar norm_factor_ = 1;
+
+        mutable bool eval_norm_factor_ = true;
+
+        mutable std::vector<scalar> res_norms_ {};
+    };
+
+    mutable localIdx maxIter_;
+
+    const localIdx minIter_;
+
+    const scalar tolerance_;
+
+    const scalar relTol_;
+
+    const scalar res_norm_eval_;
+
+    const localIdx norm_eval_limit_;
+
+    const localIdx frequency_;
+
+    const scalar relaxationFactor_;
+
+    const bool adapt_minIter_;
+
+    const std::shared_ptr<vec> normalised_res_norms_;
+
+    mutable scalar init_normalised_res_norm_;
+
+    mutable scalar normalised_res_norm_;
+
+    mutable localIdx iter_;
+
+    mutable scalar time_;
+
+public:
+
+    StoppingCriterion(const Dictionary& controlDict)
+        : maxIter_(controlDict.get<localIdx>("maxIter", 1000)),
+          minIter_(controlDict.get<localIdx>("minIter", 0)),
+          tolerance_(controlDict.get<scalar>("tolerance", 1e-6)),
+          relTol_(controlDict.get<scalar>("relTol", 1e-6)),
+          res_norm_eval_(controlDict.get<scalar>("resNormEval", 0.1)),
+          norm_eval_limit_(controlDict.get<localIdx>("normEvalLimit", 100)),
+          frequency_(controlDict.get<localIdx>("evalFrequency", 1)),
+          relaxationFactor_(controlDict.get<scalar>("relaxationFactor", 0.6)),
+          adapt_minIter_(controlDict.get<bool>("adaptMinIter", true)),
+          normalised_res_norms_(gko::share(vec::create(
+              gko::ReferenceExecutor::create(),
+              gko::dim<2> {static_cast<gko::dim<2>::dimension_type>(maxIter_), 1}
+          ))),
+          init_normalised_res_norm_(0), normalised_res_norm_(0), iter_(0), time_(0)
+    {
+        normalised_res_norms_->fill(0.0);
+        if (controlDict.get<std::string>("solver") == "GKOBiCGStab") maxIter_ *= 2;
+    }
+
+    std::shared_ptr<const gko::stop::CriterionFactory> build_dist_stopping_criterion(
+        std::shared_ptr<gko::Executor> device_exec,
+        std::shared_ptr<const gko::LinOp> gkomatrix,
+        std::shared_ptr<dist_vec> x,
+        std::shared_ptr<dist_vec> b,
+        label verbose,
+        bool export_res,
+        label prev_solve_iters,
+        scalar prev_rel_cost
+    ) const
+    {
+        std::string frequencyMode = "optimizer";
+        label minIter = minIter_;
+        label frequency = frequency_;
+        // in case of export_res all residuals need to be computed
+        if (!export_res)
+        {
+            if (prev_solve_iters > 0 && adapt_minIter_ && prev_rel_cost > 0)
+            {
+                minIter = prev_solve_iters * relaxationFactor_;
+                if (frequencyMode == "optimizer")
+                {
+                    auto alpha =
+                        sqrt(1.0 / (prev_solve_iters * (1.0 - relaxationFactor_)) * prev_rel_cost);
+                    frequency = std::min(norm_eval_limit_, std::max(1, localIdx(1 / alpha)));
+                }
+                if (frequencyMode == "relative")
+                {
+                    frequency = localIdx(prev_solve_iters * 0.075) + 1;
+                }
+            }
+        }
+
+        std::string msg = "\nCreating stopping criterion\n\tminIter: " + std::to_string(minIter)
+                        + "\n\tfrequency: " + std::to_string(frequency) + "\n\tprev_solve_iters: "
+                        + std::to_string(prev_solve_iters) + "\n\tadapt_minIter:  "
+                        + std::to_string(adapt_minIter_) + "\n\tprev_rel_cost: ";
+
+        NeoN::Logging::info(msg);
+
+        return DistStoppingCriterion::build()
+            .with_absolute_tolerance(tolerance_)
+            .with_relative_tolerance(relTol_)
+            .with_minIter(minIter)
+            .with_maxIter(maxIter_)
+            .with_frequency(frequency)
+            .with_verbose(verbose)
+            .with_export_res(export_res)
+            .with_init_residual_norm(&init_normalised_res_norm_)
+            .with_residual_norm(&normalised_res_norm_)
+            .with_residual_norms(normalised_res_norms_)
+            .with_iter(&iter_)
+            .with_time(&time_)
+            .with_gkomatrix(gkomatrix)
+            .with_x(x)
+            .with_b(b)
+            .on(device_exec);
+    }
+
+    scalar get_init_res_norm() const { return init_normalised_res_norm_; }
+
+    scalar get_res_norm() const { return normalised_res_norm_; }
+
+    std::shared_ptr<vec> get_res_norms() const { return normalised_res_norms_; }
+
+    label get_is_final() const { return relTol_ == 0.0; }
+
+    label get_num_iters() const { return iter_; }
+
+    scalar get_res_norm_time() const { return time_; }
+};


+
+#endif
+
+} // namespace Foam


HendriceH · 2026-05-27T10:59:36Z

+    SolverStats solve(
+        const LinearSystem<scalar, CSRMatrix<scalar, localIdx>, COOMatrix<scalar, localIdx>, Vec3>&
+            ls,
+        Vector<Vec3>& field
+    ) const
    {
        return solverInstance_->solve(ls, field);
    }


Also flagged by my session.

+        LinearSystem<MatrixValueType, SystemMatrixType, BoundaryMatrixType, RHSValueType> ls {
            matrix_.copyToExecutor(exec),
            rhs_.copyToExecutor(exec),
            offDiagonalMatrix_.copyToExecutor(exec),
            boundaryMatrix_.copyToExecutor(exec),
            boundaryRhs_.copyToExecutor(exec)
        };
+#ifdef NF_WITH_MPI_SUPPORT
+        ls.commPattern_ = commPattern_;
+#endif
+        return ls;


+template<unsigned int I>
+void solveComponentDist(auto& sys, auto& x, auto& exec, auto& factory, auto& stats)
+{
+    auto rhs = getComponent<I>(sys.rhs());
+    auto xcopy = getComponent<I>(x);
+    auto values = getComponent<I>(sys.matrix().values());
+    auto sparsity = sys.matrix().sparsity();
+    auto mtx = CSRMatrix<scalar, localIdx> {values, sparsity};
+
+    auto nonLocalValues = getComponent<I>(sys.offDiagonalMatrix().values());
+    auto nonLocalSparsity = sys.offDiagonalMatrix().sparsity();
+    auto nonLocalMtx = COOMatrix<scalar, localIdx> {nonLocalValues, nonLocalSparsity};
+
+    const CommunicationPattern& commPattern = sys.commPattern();
+    bool forceHostBuffer = false;
+    auto comm = gko::experimental::mpi::communicator(commPattern.env.comm(), forceHostBuffer);
+    auto gkoMtx = createGkoMtxDist(exec, comm, mtx, nonLocalMtx, commPattern);
+    auto solver = factory->generate(gkoMtx);
+    stats.entries.push_back(solve_impl_dist(exec, comm, rhs, xcopy, gkoMtx, std::move(solver)));
+    setComponent<I>(xcopy, x);
+}


lupeterm

lgtm

HendriceH

In the processorBC (not in this PR) we also might need a fence? The proc boundary data is filled and directly communicated afterwards, in processor.hpp:

virtual void correctBoundaryCondition([[maybe_unused]] Field<ValueType>& domainVector) final
    {
        detail::setProcBoundaryValue(domainVector, mesh_, this->range());
#ifdef NF_WITH_MPI_SUPPORT
        const int neighborRank =
            static_cast<int>(mesh_.boundaryMesh().neighbourRankForRange(this->range()));
        domainVector.boundaryData().communicate(this->range(), neighborRank);
#endif
    }

HendriceH · 2026-05-27T10:54:19Z

+    const auto numNonLocalElements = imap.get_non_local_size();
+
+    auto non_loc_vals = gko::array<scalar>::const_view(
+        exec, static_cast<gko::size_type>(numNonLocalElements), bmtx.values().data()
+    );


Review from my Claude:
The distributed matrix silently drops off-diagonal entries. The non-local COO block is sized from imap.get_non_local_size() (count of unique remote columns), but the values/rows/cols are taken as the first numNonLocalElements entries of bmtx (which has nProcFaces entries). This is only correct when #unique remote neighbour cells == #processor faces. The moment a local cell couples to the same remote cell through more than one face (non-convex partition boundaries, baffles, certain scotch/metis cuts), get_non_local_size() < nProcFaces, and the trailing couplings are dropped and the value slice misaligns with the column map — silent wrong matrix, converging solver, wrong answer. Use bmtx.values().size() (= nProcFaces) as the COO nnz and let the index_map handle column deduplication.

And I think this could be true? During my tests, hierarchical behaved much better than scotch.

HendriceH · 2026-05-27T10:59:36Z

+    SolverStats solve(
+        const LinearSystem<scalar, CSRMatrix<scalar, localIdx>, COOMatrix<scalar, localIdx>, Vec3>&
+            ls,
+        Vector<Vec3>& field
+    ) const
    {
        return solverInstance_->solve(ls, field);
    }


Also flagged by my session.

greole · 2026-05-27T11:08:38Z

In the processorBC (not in this PR) we also might need a fence? The proc boundary data is filled and directly communicated afterwards, in processor.hpp:

virtual void correctBoundaryCondition([[maybe_unused]] Field<ValueType>& domainVector) final
    {
        detail::setProcBoundaryValue(domainVector, mesh_, this->range());
#ifdef NF_WITH_MPI_SUPPORT
        const int neighborRank =
            static_cast<int>(mesh_.boundaryMesh().neighbourRankForRange(this->range()));
        domainVector.boundaryData().communicate(this->range(), neighborRank);
#endif
    }

this currently aims for non blocking communication. the communicate kicks of the exchange in a peer to peer fashion. however when you want to read a value from boundaryData it'll wait until all communication is ready.

Edit: @HendriceH ah i see your point the fence should be before communicate.

Some fixes to get tests running

greole changed the base branch from develop to enh/procOperatorImpl May 23, 2026 19:41

greole force-pushed the enh/procOperatorImpl branch from 0d5dd9e to a3a0153 Compare May 26, 2026 17:09

greole changed the title ~~Enh/distributed gko~~ Add distributed Ginkgo solvers May 26, 2026

greole changed the base branch from enh/procOperatorImpl to develop May 26, 2026 20:50

greole force-pushed the enh/distributedGko branch from 9555607 to 59caf1b Compare May 26, 2026 20:51

greole linked an issue May 27, 2026 that may be closed by this pull request

Check postAssmebly functor implementation #426

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greole requested a review from Copilot May 27, 2026 08:37

greole marked this pull request as ready for review May 27, 2026 08:37

Copilot started reviewing on behalf of greole May 27, 2026 08:37 View session

greole force-pushed the enh/distributedGko branch from a072087 to 84d57f7 Compare May 27, 2026 08:42

Copilot AI reviewed May 27, 2026

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greole requested review from HendriceH and lupeterm May 27, 2026 08:54

greole added the ready-for-review Set this label to indicate that the PR is ready for review label May 27, 2026

greole mentioned this pull request May 27, 2026

Enh/proc operator impl exasim-project/NeoFOAM#303

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lupeterm approved these changes May 27, 2026

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HendriceH reviewed May 27, 2026

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greole added build Everything related to building NF and removed build Everything related to building NF labels May 28, 2026

greole added 9 commits May 28, 2026 21:12

add distributed ginkgo bindings

415780a

update CHANGELOG

15ec843

fix clang-tidy issues

7361e68

pass forceHostBuffer to ginkgo, add todo note

9ca509a

address review comments

ec348f9

address review comments, add fence before communicate

a22920e

address review comments, multiface/dofs

4c878e4

fixup div by zero guard

76770c4

fixup use faceCentres from boundary mesh

c84ea7f

greole force-pushed the enh/distributedGko branch from ec4eb50 to c84ea7f Compare May 28, 2026 19:13

greole added build Everything related to building NF and removed build Everything related to building NF labels May 28, 2026

wip fix gko::not_support csr issue

626e797

greole added build Everything related to building NF and removed build Everything related to building NF labels May 29, 2026

greole changed the title ~~Add distributed Ginkgo solvers~~ Add distributed Ginkgo solver May 29, 2026

greole added build Everything related to building NF and removed build Everything related to building NF labels May 29, 2026

greole and others added 5 commits May 29, 2026 20:09

set export CUDA_VISIBLE_DEVICES=0 in nvidia run

dc05a5d

Some fixes to get tests running

74080af

Merge pull request #529 from exasim-project/fix/distributedGko-tests

da77a0b

Some fixes to get tests running

fix compiler warning

504e5d2

fixup clang-tidy

e1018ba

greole merged commit b42b40a into develop May 30, 2026
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Add distributed Ginkgo solver#522

Add distributed Ginkgo solver#522
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