System and method to provide multicast group membership defined relative to partition membership in a high performance computing environment

A system for providing multicast group membership defined relative to partition membership in a high performance computing environment, the system comprising a subnet manager, the subnet manager comprising a processor, wherein the processor is configured to:

• receive a request to create a multicast group, the request being associated with a partition, the request indicating that each member of the partition should be included in the multicast group;
• determine than the request to create the multicast group is an initial request;
• allocate a multicast local identifier for the multicast group;
• gather each member of the partition from a cached topology;
• and
• add each member of the partition to the multicast group.

A non-transitory machine readable storage medium having instructions stored thereon for supporting multicast group membership defined relative to partition membership in a high performance computing environment that, when executed, cause a subnet manager of a subnet to perform steps comprising:

• receiving, by a subnet manager of a subnet, a request to create a multicast group, the request being associated with a partition, the request indicating that each member of the partition should be included in the multicast group;
• determining, by the subnet manager, than the request to create the multicast group is an initial request;
• allocating, by the subnet manager, a multicast local identifier for the multicast group;
• gathering, by the subnet manager, each member of the partition from a cached topology;
• and
• adding each member of the partition to the multicast group.