Function: host_get_device_pointer

Applicable Products

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

Description

Obtains the device memory address registered and mapped by the acl.rt.host_register or acl.rt.host_register_v2 API. This address cannot be used for memory operations, such as memory copy.

Prototype

C Prototype

aclError aclrtHostGetDevicePointer(void *pHost, void **pDevice, uint32_t flag)

Python Function

ptr_device, ret =acl.rt.host_get_device_pointer (ptr_host, flag)

Parameters

Parameter	Description
ptr_host	Host memory address mapped and registered by calling acl.rt.host_register or acl.rt.host_register_v2.
flag	Reserved. The value is fixed at 0.

Return Values

Return Value	Description
ptr_device	Int, device memory address.
ret	Int, 0 on success; else failure.

Parent topic: Host Memory Management