aclrtDeviceCanAccessPeer
Applicability
|
Product |
Supported |
|---|---|
|
Atlas 350 Accelerator Card |
√ |
|
|
√ |
|
|
√ |
|
|
☓ |
|
|
√ |
|
|
√ |
Description
Queries whether data exchange is supported between devices.
Prototype
1
|
aclError aclrtDeviceCanAccessPeer(int32_t *canAccessPeer, int32_t deviceId, int32_t peerDeviceId) |
Parameters
|
Parameter |
Input/Output |
Description |
|---|---|---|
|
canAccessPeer |
Output |
Whether data exchange is supported. 1 indicates that data exchange is supported, and 0 indicates that data exchange is not supported. |
|
deviceId |
Input |
ID of the specified device, which must be different from peerDeviceId. Must be in the range of [0, Device count – 1]. Call aclrtGetDeviceCount to obtain the device count. |
|
peerDeviceId |
Input |
ID of the specified device, which must be different from deviceId. Must be in the range of [0, Device count – 1]. Call aclrtGetDeviceCount to obtain the device count. |
Returns
0 on success; otherwise, failure. For details, see aclError.
Restrictions
- This API supports memory copy only in physical machines and containers.
- This API supports data exchange only between devices in the same PCIe switch. In the AI Server scenario, data exchange between devices is supported although they reside in different PCIe switches.
- This API supports data exchange only between devices in the same physical machine or container.
- This API supports data exchange only between devices of threads in the same process.
- This API supports memory copy between devices in the same PCIe switch only when the related ports of the host are enabled (such as the host BIOS).