# 6.2. CUpti_ActivityAPI

struct CUpti_ActivityAPI

  The activity record for a driver or runtime API invocation.

  This activity record represents an invocation of a driver or runtime API (CUPTI_ACTIVITY_KIND_DRIVER and CUPTI_ACTIVITY_KIND_RUNTIME).

  Public Members

  CUpti_ActivityKind kind

    The activity record kind, must be CUPTI_ACTIVITY_KIND_DRIVER, CUPTI_ACTIVITY_KIND_RUNTIME, or CUPTI_ACTIVITY_KIND_INTERNAL_LAUNCH_API.

  CUpti_CallbackId cbid

    The ID of the driver or runtime function.

  uint64_t start

    The start timestamp for the function, in ns.

    A value of 0 for both the start and end timestamps indicates that timestamp information could not be collected for the function.

  uint64_t end

    The end timestamp for the function, in ns.

    A value of 0 for both the start and end timestamps indicates that timestamp information could not be collected for the function.

  uint32_t processId

    The ID of the process where the driver or runtime CUDA function is executing.

  uint32_t threadId

    The ID of the thread where the driver or runtime CUDA function is executing.

  uint32_t correlationId

    The correlation ID of the driver or runtime CUDA function.

    Each function invocation is assigned a unique correlation ID that is identical to the correlation ID in the memcpy, memset, or kernel activity record that is associated with this function.

  uint32_t returnValue

    The return value for the function.

    For a CUDA driver function with will be a CUresult value, and for a CUDA runtime function this will be a cudaError_t value.