VecCUDAGetArrayRead

Provides read access to the CUDA buffer inside a vector.

Synopsis

#include <petscvec.h> 
PetscErrorCode VecCUDAGetArrayRead(Vec v, const PetscScalar **a)

Not Collective; Asynchronous; No Fortran Support

Input Parameter

• v - the vector

Output Parameter

• a - the CUDA pointer.

Notes

See VecCUDAGetArray() for data movement semantics of this function.

This function assumes that the user will not modify the vector data. This is analgogous to intent(in) in Fortran.

The device pointer must be restored by calling VecCUDARestoreArrayRead(). If the data on the host side was previously up to date it will remain so, i.e. data on both the device and the host is up to date. Accessing data on the host side does not incur a device to host data transfer.

See Also

Vectors and Parallel Data, VecCUDARestoreArrayRead(), VecCUDAGetArray(), VecCUDAGetArrayWrite(), VecGetArray(), VecGetArrayRead()

Level

intermediate

Location

src/vec/vec/impls/seq/cupm/cuda/vecseqcupm.cu

Examples

src/snes/tutorials/ex47cu.cu

---

Edit on GitLab

Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages