Communicator

template<class... attr_val_type> comm_attr CCL_API create_comm_attr (attr_val_type &&... avs)

Creates an attribute object that may be used to control the create_communicator operation.

Returns

an attribute object

template<class... attr_val_type> comm_split_attr CCL_API create_comm_split_attr (attr_val_type &&... avs)

Creates an attribute object that may be used to control the split_communicator operation.

Returns

an attribute object

template<class DeviceType, class ContextType> vector_class< communicator > CCL_API create_communicators (int size, const vector_class< pair_class< int, DeviceType >> &devices, const ContextType &context, shared_ptr_class< kvs_interface > kvs, const comm_attr &attr=default_comm_attr)

Creates new communicators with user supplied size, ranks, local device-rank mapping and kvs.

Parameters

• size – user-supplied total number of ranks

• rank – user-supplied rank

• device – local device

• devices – user-supplied mapping of local ranks on devices

• context – context containing the devices

• kvs – key-value store for ranks wire-up

• attr – optional communicator attributes

Returns

vector of communicators / communicator

template<class DeviceType, class ContextType> vector_class< communicator > CCL_API create_communicators (int size, const map_class< int, DeviceType > &devices, const ContextType &context, shared_ptr_class< kvs_interface > kvs, const comm_attr &attr=default_comm_attr)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

template<class DeviceType, class ContextType> communicator CCL_API create_communicator (int size, int rank, DeviceType &device, const ContextType &context, shared_ptr_class< kvs_interface > kvs, const comm_attr &attr=default_comm_attr)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

communicator CCL_API create_communicator (int size, int rank, shared_ptr_class< kvs_interface > kvs, const comm_attr &attr=default_comm_attr)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

template<class DeviceType, class ContextType> vector_class< communicator > CCL_API create_communicators (int size, const vector_class< DeviceType > &devices, const ContextType &context, shared_ptr_class< kvs_interface > kvs, const comm_attr &attr=default_comm_attr)

Creates a new communicators with user supplied size, local devices and kvs. Ranks will be assigned automatically.

Parameters

• size – user-supplied total number of ranks

• devices – user-supplied device objects for local ranks

• context – context containing the devices

• kvs – key-value store for ranks wire-up

• attr – optional communicator attributes

Returns

vector of communicators / communicator

communicator CCL_API create_communicator (int size, shared_ptr_class< kvs_interface > kvs, const comm_attr &attr=default_comm_attr)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

communicator CCL_API create_communicator (const comm_attr &attr=default_comm_attr)

Creates a new communicator with externally provided size, rank and kvs. Implementation is platform specific and non portable.

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

attr – optional communicator attributes

Returns

communicator

vector_class< communicator > CCL_API split_communicators (const vector_class< pair_class< communicator, comm_split_attr >> &attrs)

Splits communicators according to attributes.

Parameters

attrs – split attributes for local communicators

Returns

vector of communicators