NAME

       fi_tcp - The msg sockets Fabric Provider

OVERVIEW

       The  tcp  provider  can be used on any system that supports TCP sockets.  The provider is not intended to
       provide performance improvements over regular TCP sockets, but  rather  to  allow  developers  to  write,
       test,and debug application code even on platforms that do not have high-performance fabric hardware.

SUPPORTED FEATURES

       The following features are supported

       Endpoint types
              FI_EP_MSG is the only supported endpoint type.  Reliable datagram endpoint over TCP sockets can be
              achieved  by  layering RxM over tcp provider.  FI_EP_RDM is supported by layering ofi_rxm provider
              on top of the tcp provider.

       Endpoint capabilities
              The tcp provider currently supports FI_MSG, FI_RMA

       Progress
              Currently tcp provider supports only FI_PROGRESS_MANUAL

       Shared Rx Context
              The tcp provider supports shared receive context

       Multi recv buffers
              The tcp provider supports multi recv buffers

RUNTIME PARAMETERS

       The tcp provider check for the following environment variables -

       FI_TCP_IFACE
              A specific network interface can be requested with this variable

       FI_TCP_PORT_LOW_RANGE/FI_TCP_PORT_HIGH_RANGE
              These variables are used to set the range of ports to be used by the tcp provider for its  passive
              endpoint  creation.   This  is  useful where only a range of ports are allowed by firewall for tcp
              connections.

       FI_TCP_TX_SIZE
              Default tx context size (default: 256)

       FI_TCP_RX_SIZE
              Default rx context size (default: 256)

LIMITATIONS

       The tcp provider is implemented over TCP sockets to emulate libfabric API.  Hence the performance may  be
       lower than what an application might see implementing to sockets directly, depending on the types of data
       transfers the application is trying to achieve.

SEE ALSO

       fabric(7), fi_provider(7), fi_getinfo(3)

AUTHORS

       OpenFabrics.

Libfabric Programmer’s Manual                      2022-12-11                                          fi_tcp(7)