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	x

Disables memory copy between the current device and a specified device. This API disables device-level memory copy.

C Prototype

aclError aclrtDeviceDisablePeerAccess(int32_t peerDeviceId)

Python Function

ret = acl.rt.device_disable_peer_access(peer_dev_id)

Parameter	Description
peer_dev_id	Int, device ID, which must be different from the current device ID. Must be in the range of [0, Device count – 1]. Call acl.rt.get_device_count to obtain the device count.

Parameter

Description

peer_dev_id

Int, device ID, which must be different from the current device ID.

Must be in the range of [0, Device count – 1]. Call acl.rt.get_device_count to obtain the device count.

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

Call acl.rt.device_disable_peer_access twice to enable data exchange between two devices. For example, call acl.rt.device_enable_peer_access once to enable data exchange between device 0 and device 1, and call acl.rt.device_disable_peer_access again to enable data exchange between device 1 and device 0.
This API is not supported by the Atlas 500 Pro (model 3000).

Function: device_disable_peer_access