======Dispatch Manager Scheduler 5.8====== In order to decouple the scheduling process, GridWay uses a Scheduler module to schedule jobs. The format to send a scheduling request to the Scheduler, through its standard input, is:SCHEDULE - - -On the other side, the format to receive a response from the Scheduler, through its standard output, is:OPERATION JID RESULT INFOWhere: * OPERATION: Is the operation requested to the Dispatch Manager. The Dispatch Manager only supports the SCHEDULE_JOB operation. * JID: It is a job identifier. * RESULT: It is the result of the operation. Could be SUCCESS or FAILURE. * INFO: If RESULT is FAILURE, it contains the cause of failure. Otherwise, if OPERATION is SCHEDULE_JOB it contains a resource specification in the form HID:QNAME:RANK, where: * HID: It is the host identifier, as provided by **gwhost** command. * QNAME: It is the queue name. * RANK: It is the rank of the host. GridWay 5 includes a scheduler template (''gw_scheduler_skel.c'') to develop custom schedulers. As an example a Round-Robin/Flooding scheduler can be found in the GridWay distribution (''gw_flood_scheduler.c'', in ''$GW_LOCATION/src/sched/''). This is a very simple scheduling algorithm, which maximizes the number of jobs submitted to the Grid.