CUpti_ActivityNvLink3 Struct Reference
[CUPTI Activity API]

NVLink information. More...


Data Fields

uint64_t bandwidth
uint32_t flag
union {
idDev0
union {
idDev1
CUpti_ActivityKind kind
uint32_t nvlinkVersion
uint8_t nvswitchConnected
uint8_t pad [7]
uint32_t physicalNvLinkCount
int8_t portDev0 [CUPTI_MAX_NVLINK_PORTS]
int8_t portDev1 [CUPTI_MAX_NVLINK_PORTS]
CUpti_DevType typeDev0
CUpti_DevType typeDev1
uint32_t domainId
uint32_t index


Detailed Description

This structure gives capabilities of each logical NVLink connection between two devices, gpu<->gpu or gpu<->CPU which can be used to understand the topology.

Field Documentation

Banwidth of NVLink in kbytes/sec

Domain ID of NPU. On Linux, this can be queried using lspci.

Flag gives capabilities of the link

See also:
CUpti_LinkFlag

If typeDev0 is CUPTI_DEV_TYPE_GPU, UUID for device 0. CUpti_ActivityDevice2. If typeDev0 is CUPTI_DEV_TYPE_NPU, struct npu for NPU.

If typeDev1 is CUPTI_DEV_TYPE_GPU, UUID for device 1. CUpti_ActivityDevice2. If typeDev1 is CUPTI_DEV_TYPE_NPU, struct npu for NPU.

Index of the NPU. First index will always be zero.

The activity record kind, must be CUPTI_ACTIVITY_KIND_NVLINK.

NvLink version.

NVSwitch is connected as an intermediate node.

Undefined. reserved for internal use

Number of physical NVLinks present between two devices.

int8_t CUpti_ActivityNvLink3::portDev0[CUPTI_MAX_NVLINK_PORTS]

Port numbers for maximum 16 NVLinks connected to device 0. If typeDev0 is CUPTI_DEV_TYPE_NPU, ignore this field. In case of invalid/unknown port number, this field will be set to value CUPTI_NVLINK_INVALID_PORT. This will be used to correlate the metric values to individual physical link and attribute traffic to the logical NVLink in the topology.

int8_t CUpti_ActivityNvLink3::portDev1[CUPTI_MAX_NVLINK_PORTS]

Port numbers for maximum 16 NVLinks connected to device 1. If typeDev1 is CUPTI_DEV_TYPE_NPU, ignore this field. In case of invalid/unknown port number, this field will be set to value CUPTI_NVLINK_INVALID_PORT. This will be used to correlate the metric values to individual physical link and attribute traffic to the logical NVLink in the topology.

Type of device 0 CUpti_DevType

Type of device 1 CUpti_DevType


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