add sanity check to ginkgo block preconditioner test

tests/hyteg/composites/P2P1Stokes3DGinkgoSolveTest.cpp

@@ -24,6 +24,7 @@
 
 #include "hyteg/composites/P2P1TaylorHoodFunction.hpp"
 #include "hyteg/composites/P2P1TaylorHoodStokesOperator.hpp"
+#include "hyteg/dataexport/TimingOutput.hpp"
 #include "hyteg/ginkgo/GinkgoBlockSolver.hpp"
 #include "hyteg/ginkgo/GinkgoUtilities.hpp"
 #include "hyteg/mesh/MeshInfo.hpp"
@@ -45,13 +46,13 @@ namespace hyteg {
 /// \param blockPreconditionerType
 ///     0: velocity AMG, pressure lumped mass
 ///     1: velocity Jacobi, pressure lumped mass
-void petscSolveTest( std::shared_ptr< const gko::Executor > exec,
-                     const uint_t&                          blockPreconditionerType,
-                     const uint_t&                          level,
-                     const MeshInfo&                        meshInfo,
-                     const real_t&                          resEps,
-                     const real_t&                          errEpsUSum,
-                     const real_t&                          errEpsP )
+void petscSolveTest( std::shared_ptr< gko::Executor > exec,
+                     const uint_t&                    blockPreconditionerType,
+                     const uint_t&                    level,
+                     const MeshInfo&                  meshInfo,
+                     const real_t&                    resEps,
+                     const real_t&                    errEpsUSum,
+                     const real_t&                    errEpsP )
 {
    SetupPrimitiveStorage setupStorage( meshInfo, uint_c( walberla::mpi::MPIManager::instance()->numProcesses() ) );
 
@@ -126,10 +127,13 @@ void petscSolveTest( std::shared_ptr< const gko::Executor > exec,
    }
 
    walberla::WcTimer timer;
-   WALBERLA_LOG_INFO_ON_ROOT( "Block precond. BiCGStab solver (preconditioner: " << precondType << ") ..." )
+   WALBERLA_LOG_INFO_ON_ROOT( "Block precond. GMRes solver (preconditioner: " << precondType << ") ..." )
    solver->solve( A, x, b, level );
    timer.end();
 
+   WALBERLA_LOG_INFO_ON_ROOT( "Sanity check for block precond. GMRes solver (preconditioner: " << precondType << ") ..." )
+   solver->solve( A, x, b, level );
+
    hyteg::vertexdof::projectMean( x.p, level );
 
    WALBERLA_LOG_INFO_ON_ROOT( "time was: " << timer.last() );