Here GraghLab treats each vertex as a unit of work to do and the work queue contains all the vertices that need to be processed (we defined a program on how to process each vertex and gave to graghlab). Here, signal_all means all vertices need processing and all put onto the work queue. Later there is some sample code to put individual vertex onto the queue as well through
"vertex.signal()".
Here GraghLab treats each vertex as a unit of work to do and the work queue contains all the vertices that need to be processed (we defined a program on how to process each vertex and gave to graghlab). Here, signal_all means all vertices need processing and all put onto the work queue. Later there is some sample code to put individual vertex onto the queue as well through "vertex.signal()".