Actual source code: mcudahost.cu
petsc-3.13.6 2020-09-29
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      1:  #include <petscsys.h>
      2:  #include <petsccublas.h>

      4: static PetscErrorCode PetscCUDAHostMalloc(size_t a,PetscBool clear,int lineno,const char function[],const char filename[],void **result)
      5: {
      6:   cudaError_t ierr;
      7:   cudaMallocHost(result,a);CHKERRCUDA(ierr);
      8:   return 0;
      9: }

     11: static PetscErrorCode PetscCUDAHostFree(void *aa,int lineno,const char function[],const char filename[])
     12: {
     13:   cudaError_t ierr;
     14:   cudaFreeHost(aa);CHKERRCUDA(ierr);
     15:   return 0;
     16: }

     18: static PetscErrorCode PetscCUDAHostRealloc(size_t a,int lineno,const char function[],const char filename[],void **result)
     19: {
     20:   SETERRQ(PETSC_COMM_SELF,PETSC_ERR_MEM,"CUDA has no Realloc()");
     21: }

     23: static PetscErrorCode (*PetscMallocOld)(size_t,PetscBool,int,const char[],const char[],void**);
     24: static PetscErrorCode (*PetscReallocOld)(size_t,int,const char[],const char[],void**);
     25: static PetscErrorCode (*PetscFreeOld)(void*,int,const char[],const char[]);

     27: /*@C
     28:    PetscMallocSetCUDAHost - Set PetscMalloc to use CUDAHostMalloc
     29:      Switch the current malloc and free routines to the CUDA malloc and free routines

     31:    Not Collective

     33:    Level: developer

     35:    Notes:
     36:      This provides a way to use the CUDA malloc and free routines temporarily. One
     37:      can switch back to the previous choice by calling PetscMallocResetCUDAHost().

     39: .seealso: PetscMallocResetCUDAHost()
     40: @*/
     41: PetscErrorCode PetscMallocSetCUDAHost(void)
     42: {
     44:   /* Save the previous choice */
     45:   PetscMallocOld  = PetscTrMalloc;
     46:   PetscReallocOld = PetscTrRealloc;
     47:   PetscFreeOld    = PetscTrFree;
     48:   PetscTrMalloc   = PetscCUDAHostMalloc;
     49:   PetscTrRealloc  = PetscCUDAHostRealloc;
     50:   PetscTrFree     = PetscCUDAHostFree;
     51:   return(0);
     52: }

     54: /*@C
     55:    PetscMallocResetCUDAHost - Reset the changes made by PetscMallocSetCUDAHost

     57:    Not Collective

     59:    Level: developer

     61: .seealso: PetscMallocSetCUDAHost()
     62: @*/
     63: PetscErrorCode PetscMallocResetCUDAHost(void)
     64: {
     66:   PetscTrMalloc  = PetscMallocOld;
     67:   PetscTrRealloc = PetscReallocOld;
     68:   PetscTrFree    = PetscFreeOld;
     69:   return(0);
     70: }