# 6.53. CUpti_ActivityMemcpyPtoP4

struct CUpti_ActivityMemcpyPtoP4

  The activity record for peer-to-peer memory copies.

  This activity record represents a peer-to-peer memory copy (CUPTI_ACTIVITY_KIND_MEMCPY2).

  Public Members

  CUpti_ActivityKind kind

    The activity record kind, must be CUPTI_ACTIVITY_KIND_MEMCPY2.

  uint8_t copyKind

    The kind of the memory copy, stored as a byte to reduce record size.

    See also

    CUpti_ActivityMemcpyKind

  uint8_t srcKind

    The source memory kind read by the memory copy, stored as a byte to reduce record size.

    See also

    CUpti_ActivityMemoryKind

  uint8_t dstKind

    The destination memory kind read by the memory copy, stored as a byte to reduce record size.

    See also

    CUpti_ActivityMemoryKind

  uint8_t flags

    The flags associated with the memory copy.

    See also

    CUpti_ActivityFlag

  uint64_t bytes

    The number of bytes transferred by the memory copy.

  uint64_t start

    The start timestamp for the memory copy, in ns.

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

  uint64_t end

    The end timestamp for the memory copy, in ns.

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

  uint32_t deviceId

    The ID of the device where the memory copy is occurring.

  uint32_t contextId

    The ID of the context where the memory copy is occurring.

  uint32_t streamId

    The ID of the stream where the memory copy is occurring.

  uint32_t srcDeviceId

    The ID of the device where memory is being copied from.

  uint32_t srcContextId

    The ID of the context owning the memory being copied from.

  uint32_t dstDeviceId

    The ID of the device where memory is being copied to.

  uint32_t dstContextId

    The ID of the context owning the memory being copied to.

  uint32_t correlationId

    The correlation ID of the memory copy.

    Each memory copy is assigned a unique correlation ID that is identical to the correlation ID in the driver and runtime API activity record that launched the memory copy.

  void *reserved0

    Undefined.

    Reserved for internal use.

  uint64_t graphNodeId

    The unique ID of the graph node that executed the memcpy through graph launch.

    This field will be 0 if memcpy is not done using graph launch.

  uint32_t graphId

    The unique ID of the graph that executed this memcpy through graph launch.

    This field will be 0 if the memcpy is not done through graph launch.

  uint32_t channelID

    The ID of the HW channel on which the memory copy is occurring.

  CUpti_ChannelType channelType

    The type of the channel.