Date: 2025-03-28T21:10:40+00:00

Actual source code: petsclandau.h

      1: #pragma once

      3: #include <petscdmplex.h>
      4: #include <petscts.h>

      6: PETSC_EXTERN PetscErrorCode DMPlexLandauPrintNorms(Vec, PetscInt);
      7: PETSC_EXTERN PetscErrorCode DMPlexLandauCreateVelocitySpace(MPI_Comm, PetscInt, const char[], Vec *, Mat *, DM *);
      8: PETSC_EXTERN PetscErrorCode DMPlexLandauDestroyVelocitySpace(DM *);
      9: PETSC_EXTERN PetscErrorCode DMPlexLandauAccess(DM, Vec, PetscErrorCode (*)(DM, Vec, PetscInt, PetscInt, PetscInt, void *), void *);
     10: PETSC_EXTERN PetscErrorCode DMPlexLandauAddMaxwellians(DM, Vec, PetscReal, PetscReal[], PetscReal[], PetscInt, PetscInt, PetscInt, void *);
     11: PETSC_EXTERN PetscErrorCode DMPlexLandauCreateMassMatrix(DM dm, Mat *Amat);
     12: PETSC_EXTERN PetscErrorCode DMPlexLandauIFunction(TS, PetscReal, Vec, Vec, Vec, void *);
     13: PETSC_EXTERN PetscErrorCode DMPlexLandauIJacobian(TS, PetscReal, Vec, Vec, PetscReal, Mat, Mat, void *);

     15: typedef PetscInt LandauIdx;

     17: /* the Fokker-Planck-Landau context */
     18: #if !defined(LANDAU_MAX_SPECIES)
     19:   #if defined(PETSC_USE_DMLANDAU_2D)
     20:     #define LANDAU_MAX_SPECIES 10
     21:     #define LANDAU_MAX_GRIDS   3
     22:   #else
     23:     #define LANDAU_MAX_SPECIES 10
     24:     #define LANDAU_MAX_GRIDS   3
     25:   #endif
     26: #else
     27:   #define LANDAU_MAX_GRIDS 3
     28: #endif

     30: #if !defined(LANDAU_MAX_Q)
     31:   #if defined(LANDAU_MAX_NQND)
     32:     #error "LANDAU_MAX_NQND but not LANDAU_MAX_Q. Use -DLANDAU_MAX_Q=4 for Q3 elements"
     33:   #endif
     34:   #if defined(PETSC_USE_DMLANDAU_2D)
     35:     #define LANDAU_MAX_Q 6
     36:   #else
     37:     #define LANDAU_MAX_Q 5
     38:   #endif
     39: #else
     40:   #undef LANDAU_MAX_NQND
     41: #endif

     43: #if defined(PETSC_USE_DMLANDAU_2D)
     44:   #define LANDAU_MAX_Q_FACE   LANDAU_MAX_Q
     45:   #define LANDAU_MAX_NQND     (LANDAU_MAX_Q * LANDAU_MAX_Q)
     46:   #define LANDAU_MAX_BATCH_SZ 1024
     47:   #define LANDAU_DIM          2
     48: #else
     49:   #define LANDAU_MAX_Q_FACE   (LANDAU_MAX_Q * LANDAU_MAX_Q)
     50:   #define LANDAU_MAX_NQND     (LANDAU_MAX_Q * LANDAU_MAX_Q * LANDAU_MAX_Q)
     51:   #define LANDAU_MAX_BATCH_SZ 64
     52:   #define LANDAU_DIM          3
     53: #endif

     55: typedef enum {
     56:   LANDAU_KOKKOS,
     57:   LANDAU_CPU
     58: } LandauDeviceType;

     60: // static data - will be "device" data
     61: typedef struct {
     62:   void *invJ;    // nip*dim*dim
     63:   void *D;       // nq*nb*dim
     64:   void *B;       // nq*nb
     65:   void *alpha;   // ns
     66:   void *beta;    // ns
     67:   void *invMass; // ns
     68:   void *w;       // nip
     69:   void *x;       // nip
     70:   void *y;       // nip
     71:   void *z;       // nip
     72:   void *Eq_m;    // ns - dynamic
     73:   void *f;       //  nip*Nf - dynamic (IP)
     74:   void *dfdx;    // nip*Nf - dynamic (IP)
     75:   void *dfdy;    // nip*Nf - dynamic (IP)
     76:   void *dfdz;    // nip*Nf - dynamic (IP)
     77:   int   dim_, ns_, nip_, nq_, nb_;
     78:   void *NCells;         // remove and use elem_offset - TODO
     79:   void *species_offset; // for each grid, but same for all batched vertices
     80:   void *mat_offset;     // for each grid, but same for all batched vertices
     81:   void *elem_offset;    // for each grid, but same for all batched vertices
     82:   void *ip_offset;      // for each grid, but same for all batched vertices
     83:   void *ipf_offset;     // for each grid, but same for all batched vertices
     84:   void *ipfdf_data;     // for each grid, but same for all batched vertices
     85:   void *maps;           // for each grid, but same for all batched vertices
     86:   // COO
     87:   void     *coo_elem_offsets;
     88:   void     *coo_elem_point_offsets;
     89:   void     *coo_elem_fullNb;
     90:   void     *coo_vals;
     91:   void     *lambdas;
     92:   LandauIdx coo_n_cellsTot;
     93:   LandauIdx coo_size;
     94:   LandauIdx coo_max_fullnb;
     95: } LandauStaticData;

     97: typedef enum {
     98:   LANDAU_EX2_TSSOLVE,
     99:   LANDAU_MATRIX_TOTAL,
    100:   LANDAU_OPERATOR,
    101:   LANDAU_JACOBIAN_COUNT,
    102:   LANDAU_JACOBIAN,
    103:   LANDAU_MASS,
    104:   LANDAU_F_DF,
    105:   LANDAU_KERNEL,
    106:   KSP_FACTOR,
    107:   KSP_SOLVE,
    108:   LANDAU_NUM_TIMERS
    109: } LandauOMPTimers;

    111: typedef struct {
    112:   PetscBool interpolate; /* Generate intermediate mesh elements */
    113:   PetscBool gpu_assembly;
    114:   MPI_Comm  comm; /* global communicator to use for errors and diagnostics */
    115:   double    times[LANDAU_NUM_TIMERS];
    116:   PetscBool use_matrix_mass;
    117:   /* FE */
    118:   PetscFE fe[LANDAU_MAX_SPECIES];
    119:   /* geometry  */
    120:   PetscReal radius[LANDAU_MAX_GRIDS];
    121:   PetscReal radius_par[LANDAU_MAX_GRIDS];
    122:   PetscReal radius_perp[LANDAU_MAX_GRIDS];
    123:   PetscReal re_radius;      /* RE: radius of refinement along v_perp=0, z>0 */
    124:   PetscReal vperp0_radius1; /* RE: radius of refinement along v_perp=0 */
    125:   PetscReal vperp0_radius2; /* RE: radius of refinement along v_perp=0 after origin AMR refinement */
    126:   PetscBool sphere;
    127:   PetscReal sphere_inner_radius_90degree[LANDAU_MAX_GRIDS];
    128:   PetscReal sphere_inner_radius_45degree[LANDAU_MAX_GRIDS];
    129:   PetscInt  cells0[3];
    130:   /* AMR */
    131:   PetscBool use_p4est;
    132:   PetscInt  numRERefine;                     /* RE: refinement along v_perp=0, z > 0 */
    133:   PetscInt  nZRefine1;                       /* RE: origin refinement after v_perp=0 refinement */
    134:   PetscInt  nZRefine2;                       /* RE: origin refinement after origin AMR refinement */
    135:   PetscInt  numAMRRefine[LANDAU_MAX_GRIDS];  /* normal AMR - refine from origin */
    136:   PetscInt  postAMRRefine[LANDAU_MAX_GRIDS]; /* uniform refinement of AMR */
    137:   PetscBool simplex;
    138:   char      filename[PETSC_MAX_PATH_LEN];
    139:   PetscReal thermal_speed[LANDAU_MAX_GRIDS];
    140:   PetscBool sphere_uniform_normal;
    141:   /* relativistic */
    142:   PetscBool use_energy_tensor_trick;
    143:   PetscBool use_relativistic_corrections;
    144:   /* physics */
    145:   PetscReal thermal_temps[LANDAU_MAX_SPECIES];
    146:   PetscReal masses[LANDAU_MAX_SPECIES];  /* mass of each species  */
    147:   PetscReal charges[LANDAU_MAX_SPECIES]; /* charge of each species  */
    148:   PetscReal n[LANDAU_MAX_SPECIES];       /* number density of each species  */
    149:   PetscReal m_0;                         /* reference mass */
    150:   PetscReal v_0;                         /* reference velocity */
    151:   PetscReal n_0;                         /* reference number density */
    152:   PetscReal t_0;                         /* reference time */
    153:   PetscReal Ez;
    154:   PetscReal epsilon0;
    155:   PetscReal k;
    156:   PetscReal lambdas[LANDAU_MAX_GRIDS][LANDAU_MAX_GRIDS];
    157:   PetscReal electronShift;
    158:   PetscInt  num_species;
    159:   PetscInt  num_grids;
    160:   PetscInt  species_offset[LANDAU_MAX_GRIDS + 1]; // for each grid, but same for all batched vertices
    161:   PetscInt  mat_offset[LANDAU_MAX_GRIDS + 1];     // for each grid, but same for all batched vertices
    162:   // batching
    163:   PetscBool  jacobian_field_major_order; // this could be a type but lets not get pedantic
    164:   VecScatter plex_batch;
    165:   Vec        work_vec;
    166:   IS         batch_is;
    167:   PetscErrorCode (*seqaij_mult)(Mat, Vec, Vec);
    168:   PetscErrorCode (*seqaij_multtranspose)(Mat, Vec, Vec);
    169:   PetscErrorCode (*seqaij_solve)(Mat, Vec, Vec);
    170:   PetscErrorCode (*seqaij_getdiagonal)(Mat, Vec);
    171:   /* COO */
    172:   Mat J;
    173:   Mat M;
    174:   Vec X;
    175:   /* derived type */
    176:   void *data;
    177:   /* computing */
    178:   LandauDeviceType deviceType;
    179:   DM               pack;
    180:   DM               plex[LANDAU_MAX_GRIDS];
    181:   LandauStaticData SData_d; /* static geometric data on device */
    182:   /* diagnostics */
    183:   PetscInt         verbose;
    184:   PetscLogEvent    events[20];
    185:   PetscLogStage    stage;
    186:   PetscObjectState norm_state;
    187:   PetscInt         batch_sz;
    188:   PetscInt         batch_view_idx;
    189: } LandauCtx;

    191: #define LANDAU_SPECIES_MAJOR
    192: #if !defined(LANDAU_SPECIES_MAJOR)
    193:   #define LAND_PACK_IDX(_b, _g)                         (_b * ctx->num_grids + _g)
    194:   #define LAND_MOFFSET(_b, _g, _nbch, _ngrid, _mat_off) (_b * _mat_off[_ngrid] + _mat_off[_g])
    195: #else
    196:   #define LAND_PACK_IDX(_b, _g)                         (_g * ctx->batch_sz + _b)
    197:   #define LAND_MOFFSET(_b, _g, _nbch, _ngrid, _mat_off) (_nbch * _mat_off[_g] + _b * (_mat_off[_g + 1] - _mat_off[_g]))
    198: #endif

    200: typedef struct {
    201:   PetscReal scale;
    202:   LandauIdx gid; // Landau matrix index (<10,000)
    203: } pointInterpolationP4est;
    204: typedef struct _lP4estVertexMaps {
    205:   LandauIdx (*gIdx)[LANDAU_MAX_SPECIES][LANDAU_MAX_NQND]; // #elems *  LANDAU_MAX_NQND
    206:   LandauIdx        num_elements;
    207:   LandauIdx        num_reduced;
    208:   LandauIdx        num_face; // (Q or Q^2 for 3D)
    209:   LandauDeviceType deviceType;
    210:   PetscInt         Nf;
    211:   pointInterpolationP4est (*c_maps)[LANDAU_MAX_Q_FACE];
    212:   struct _lP4estVertexMaps *d_self;
    213:   void                     *vp1, *vp2, *vp3;
    214:   PetscInt                  numgrids;
    215: } P4estVertexMaps;

    217: #if defined(PETSC_HAVE_KOKKOS)
    218: PETSC_EXTERN PetscErrorCode LandauKokkosJacobian(DM[], const PetscInt, const PetscInt, const PetscInt, const PetscInt, const PetscInt[], PetscReal[], PetscScalar[], const PetscScalar[], const LandauStaticData *, const PetscReal, const PetscLogEvent[], const PetscInt[], const PetscInt[], Mat[], Mat);
    219: PETSC_EXTERN PetscErrorCode LandauKokkosCreateMatMaps(P4estVertexMaps *, pointInterpolationP4est (*)[LANDAU_MAX_Q_FACE], PetscInt[], PetscInt);
    220: PETSC_EXTERN PetscErrorCode LandauKokkosDestroyMatMaps(P4estVertexMaps *, PetscInt);
    221: PETSC_EXTERN PetscErrorCode LandauKokkosStaticDataSet(DM, const PetscInt, const PetscInt, const PetscInt, const PetscInt, PetscInt[], PetscInt[], PetscInt[], PetscReal[], PetscReal[], PetscReal[], PetscReal[], PetscReal[], PetscReal[], PetscReal[], PetscReal[], PetscReal[], LandauStaticData *);
    222: PETSC_EXTERN PetscErrorCode LandauKokkosStaticDataClear(LandauStaticData *);
    223: #endif