VecCUDAGetArray#
Provides access to the device buffer inside a vector
Synopsis#
#include <petscvec.h>
PetscErrorCode VecCUDAGetArray(Vec v, PetscScalar **a)
Not Collective; Asynchronous; No Fortran Support
Input Parameter#
v - the vector
Output Parameter#
a - the device buffer
Notes#
This routine has semantics similar to VecGetArray(); the returned buffer points to a
consistent view of the vector data. This may involve copying data from the host to the device
if the data on the device is out of date. It is also assumed that the returned buffer is
immediately modified, marking the host data out of date. This is similar to intent(inout) in
Fortran.
If the user does require strong memory guarantees, they are encouraged to use
VecCUDAGetArrayRead() and/or VecCUDAGetArrayWrite() instead.
The user must call VecCUDARestoreArray() when they are finished using the array.
Developer Note#
If the device memory hasn’t been allocated previously it will be allocated as part of this routine.
See Also#
Vectors and Parallel Data, VecCUDARestoreArray(), VecCUDAGetArrayRead(), VecCUDAGetArrayWrite(), VecGetArray(),
VecGetArrayRead(), VecGetArrayWrite()
Level#
intermediate
Location#
src/vec/vec/impls/seq/cupm/cuda/vecseqcupm.cu
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages