Initiating A Collective Operation In A Parallel Computer

An apparatus for initiating a collective operation in a parallel computer, the parallel computer comprising a plurality of compute nodes, the compute nodes coupled for data communications by one or more data communications networks, the compute nodes organized in an operational group for collective operations with one compute node assigned as a root node of the operational group, the apparatus comprising a computer processor, a computer memory operatively coupled to the computer processor, the computer memory having disposed within it computer program instructions that, when executed by the computer processor, cause the apparatus to carry out the steps of:

• identifying, by a non-root compute node, a collective operation to execute in the operational group of compute nodes;
• initiating, by the non-root compute node, execution of the collective operation amongst the compute nodes of the operational group including:
• sending, by the non-root compute node to one or more of the other compute nodes in the operational group, an active message, the active message comprising information configured to initiate execution of the collective operation amongst the compute nodes of the operational group;
• and
• executing, by the compute nodes of the operational group, the collective operation.

A computer program product for initiating a collective operation in a parallel computer, the parallel computer comprising a plurality of compute nodes, the compute nodes coupled for data communications by one or more data communications networks, the compute nodes organized in an operational group for collective operations with one compute node assigned as a root node of the operational group, the computer program product disposed upon a computer readable medium, the computer program product comprising computer program instructions that, when executed, cause a computer to carry out the steps of:

• identifying, by a non-root compute node, a collective operation to execute in the operational group of compute nodes;
• initiating, by the non-root compute node, execution of the collective operation amongst the compute nodes of the operational group including:
• sending, by the non-root compute node to one or more of the other compute nodes in the operational group, an active message, the active message comprising information configured to initiate execution of the collective operation amongst the compute nodes of the operational group;
• and
• executing, by the compute nodes of the operational group, the collective operation.