Low latency variable transfer network for fine grained parallelism of virtual threads across multiple hardware threads

A method of communicating variables between a plurality of hardware threads disposed in a plurality of processing cores, each processing core including a register file and at least one hardware thread among the plurality of hardware threads, the method comprising:

• with a source hardware thread in a source processing core among the plurality of processing cores, initiating a transfer of a variable to a destination hardware thread in a destination processing core among the plurality of processing cores;
• and
• in response to initiating the transfer of the variable, communicating the variable from the source processing core to the destination processing core over a variable transfer network coupled to the source and destination processing cores.