Mechanism of supporting sub-communicator collectives with O(64) counters as opposed to one counter for each sub-communicator

A system for enhancing barrier collective synchronization on a computer system including a plurality of processing devices, a data storage device, and a program stored on the data storage device, the system for enhancing barrier collective synchronization comprising:

• a plurality of communicators for storing state information for a barrier algorithm;
• a plurality of counters, a respective one of the counters being allocated to each of the communicators;
• one or more of the plurality of processing devices configured for;
• operating a plurality of process threads, wherein each of the threads is associated with a respective one of the communicators;
• when one of the process threads initiates a barrier operation, configuring a table including setting a respective one entry in the table with an ID of the communicator associated with said one of the process threads and with an ID of the counter allocated to said associated communicator;
• and wherein others of the process threads use said table for determining the counter used in said barrier operation.

A computer program product comprising a computer readable device having a computer program recorded thereon and for execution in a computer system for enhancing barrier collective synchronization on the computer system, wherein the computer system includes a plurality of processing devices and a data storage device, the program steps comprising:

• storing information for a plurality of operations;
• providing a plurality of counters;
• allocating a respective one of the counters to each of the communicators;
• operating a plurality of process threads on the computer system, wherein each of the threads is associated with a respective one of the communicators;
• in a plurality of communicators, wherein a respective one counter is allocated to each of the communications, a plurality of process threads operate on the computer system, and each of the threads is associated with a respective one of the communications;
• when one of the process threads initiates a barrier operation, configuring a table including setting a respective one entry in the table with an ID of the communicator associated with said one of the process threads and with an ID of the counter allocated to said associated communicator;
• and
• others of the process threads using said table for determining the counter used in said barrier operation.