Actual source code: curand.c
petsc-3.15.0 2021-03-30
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      1: #include <../src/sys/classes/random/randomimpl.h>
      2: #include <curand.h>

      4: #define CHKERRCURAND(stat) \
      5: do { \
      6:    if (PetscUnlikely(stat != CURAND_STATUS_SUCCESS)) { \
      7:      if (((stat == CURAND_STATUS_INITIALIZATION_FAILED) || (stat == CURAND_STATUS_ALLOCATION_FAILED)) && PetscCUDAInitialized) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_GPU_RESOURCE,"cuRAND error %d. Reports not initialized or alloc failed; this indicates the GPU has run out resources",(int)stat); \
      8:      else SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_GPU,"cuRand error %d",(int)stat); \
      9:    } \
     10: } while (0)

     12: typedef struct {
     13:   curandGenerator_t gen;
     14: } PetscRandom_CURAND;

     16: PetscErrorCode PetscRandomSeed_CURAND(PetscRandom r)
     17: {
     18:   curandStatus_t     cerr;
     19:   PetscRandom_CURAND *curand = (PetscRandom_CURAND*)r->data;

     22:   cerr = curandSetPseudoRandomGeneratorSeed(curand->gen,r->seed);CHKERRCURAND(cerr);
     23:   return(0);
     24: }

     26: PETSC_INTERN PetscErrorCode PetscRandomCurandScale_Private(PetscRandom,size_t,PetscReal*,PetscBool);

     28: PetscErrorCode  PetscRandomGetValuesReal_CURAND(PetscRandom r, PetscInt n, PetscReal *val)
     29: {
     30:   curandStatus_t     cerr;
     31:   PetscRandom_CURAND *curand = (PetscRandom_CURAND*)r->data;
     32:   size_t             nn = n < 0 ? -2*(size_t)n : n; /* handle complex case */

     35: #if defined(PETSC_USE_REAL_SINGLE)
     36:   cerr = curandGenerateUniform(curand->gen,val,nn);CHKERRCURAND(cerr);
     37: #else
     38:   cerr = curandGenerateUniformDouble(curand->gen,val,nn);CHKERRCURAND(cerr);
     39: #endif
     40:   if (r->iset) {
     41:     PetscErrorCode PetscRandomCurandScale_Private(r,nn,val,(PetscBool)(n<0));
     42:   }
     43:   return(0);
     44: }

     46: PetscErrorCode PetscRandomGetValues_CURAND(PetscRandom r, PetscInt n, PetscScalar *val)
     47: {

     51: #if defined(PETSC_USE_COMPLEX)
     52:   /* pass negative size to flag complex scaling (if needed) */
     53:   PetscRandomGetValuesReal_CURAND(r,-n,(PetscReal*)val);
     54: #else
     55:   PetscRandomGetValuesReal_CURAND(r,n,val);
     56: #endif
     57:   return(0);
     58: }

     60: PetscErrorCode PetscRandomDestroy_CURAND(PetscRandom r)
     61: {
     62:   PetscErrorCode     ierr;
     63:   curandStatus_t     cerr;
     64:   PetscRandom_CURAND *curand = (PetscRandom_CURAND*)r->data;

     67:   cerr = curandDestroyGenerator(curand->gen);CHKERRCURAND(cerr);
     68:   PetscFree(r->data);
     69:   return(0);
     70: }

     72: static struct _PetscRandomOps PetscRandomOps_Values = {
     73:   PetscRandomSeed_CURAND,
     74:   NULL,
     75:   NULL,
     76:   PetscRandomGetValues_CURAND,
     77:   PetscRandomGetValuesReal_CURAND,
     78:   PetscRandomDestroy_CURAND,
     79:   NULL
     80: };

     82: /*MC
     83:    PETSCCURAND - access to the CUDA random number generator

     85:   Level: beginner

     87: .seealso: PetscRandomCreate(), PetscRandomSetType()
     88: M*/

     90: PETSC_EXTERN PetscErrorCode PetscRandomCreate_CURAND(PetscRandom r)
     91: {
     92:   PetscErrorCode     ierr;
     93:   curandStatus_t     cerr;
     94:   PetscRandom_CURAND *curand;

     97:   PetscCUDAInitializeCheck();
     98:   PetscNewLog(r,&curand);
     99:   cerr = curandCreateGenerator(&curand->gen,CURAND_RNG_PSEUDO_DEFAULT);CHKERRCURAND(cerr);
    100:   /* https://docs.nvidia.com/cuda/curand/host-api-overview.html#performance-notes2 */
    101:   cerr = curandSetGeneratorOrdering(curand->gen,CURAND_ORDERING_PSEUDO_SEEDED);CHKERRCURAND(cerr);
    102:   PetscMemcpy(r->ops,&PetscRandomOps_Values,sizeof(PetscRandomOps_Values));
    103:   PetscObjectChangeTypeName((PetscObject)r,PETSCCURAND);
    104:   r->data = curand;
    105:   r->seed = 1234ULL; /* taken from example */
    106:   PetscRandomSeed_CURAND(r);
    107:   return(0);
    108: }