System and method for a multicast send duplication instead of replication in a high performance computing environment

A method for multicast send duplication instead of replication in a high performance computing environment, comprising:

• providing, at a computer, the computer comprising one or more microprocessors,
• a plurality of switches;
• a plurality of hosts, the plurality of hosts being interconnected via the plurality of switches, wherein a host of the plurality of hosts comprises a multicast sender node, the sender node comprising a system image generation module and a current message sequence module;
• organizing the plurality of switches into two rails, the two or more rails providing redundant connectivity between the plurality of hosts;
• sending, by the multicast sender node, two or more duplicate multicast packets addressed to a multicast address, wherein each of the two or more duplicate multicast packets are sent on a different rail of the two rails.

A non-transitory computer readable storage medium having instructions thereon for multicast send duplication instead of replication in a high performance computing environment, which when read and executed cause a computer to perform steps comprising:

• providing, at a computer, the computer comprising one or more microprocessors,
• a plurality of switches;
• a plurality of hosts, the plurality of hosts being interconnected via the plurality of switches, wherein a host of the plurality of hosts comprises a multicast sender node, the sender node comprising a system image generation module and a current message sequence module;
• organizing the plurality of switches into two rails, the two or more rails providing redundant connectivity between the plurality of hosts;
• sending, by the multicast sender node, two or more duplicate multicast packets addressed to a multicast address, wherein each of the two or more duplicate multicast packets are sent on a different rail of the two rails.