an amount of data stored in the at least one shared memory, the data corresponding to {HEAD ~ the tasks} associated with {TAIL ~ the node} 
associated with
an amount of data stored in the at least one shared memory , the data corresponding to { HEAD ~ the tasks } associated with { TAIL ~ the node }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL