Applicable Products

Product	Supported (√/x)
Ascend 950PR/Ascend 950DT	√
Atlas A3 training products/Atlas A3 inference products	√
Atlas A2 training products/Atlas A2 inference products	√
Atlas training products	√
Atlas inference products	√
Atlas 200I/500 A2 inference products	√

Description

Implements asynchronous memory copy, which is mainly used for matrix data replication. This is an asynchronous API.

The Atlas inference accelerator module does not support this API.

Prototype

C Prototype

aclError aclrtMemcpy2dAsync(void *dst, size_t dpitch, const void *src, size_t spitch, size_t width, size_t height, aclrtMemcpyKind kind, aclrtStream stream)

Python Function

ret = acl.rt.memcpy2d_async(dst, dpitch, src, spitch, width, height, kind, stream)

Parameters

Parameter	Description
dst	Int, pointer address of the destination memory address.
dpitch	Int, address distance between two adjacent columns of vectors in the destination memory.
src	Int, pointer address of the source memory address.
spitch	Int, address distance between two adjacent columns of vectors in the source memory.
width	Int, matrix width to be copied. It must be less than or equal to dpitch and spitch. The maximum value of width is 5000000.
height	Int, matrix height to be copied. The maximum height can be set to 5242880 (5 x 1024 x 1024). Otherwise, a failure is returned.
kind	Int, memory copy type. ACL_MEMCPY_HOST_TO_HOST = 0 // Copy memory within the host. ACL_MEMCPY_HOST_TO_DEVICE = 1 // Copy memory from the host to the device. ACL_MEMCPY_DEVICE_TO_HOST = 2 // Copy memory from the device to the host. ACL_MEMCPY_DEVICE_TO_DEVICE = 3 // Copy memory within a device. ACL_MEMCPY_DEFAULT = 4 // The system determines the copy direction based on the source and destination memory addresses.
stream	Int, pointer address of the stream.

Return Values

Return Value	Description
ret	Int, error code. 0 on success; else, failure.

Restrictions