Currently must spawn all tasks at startup time. MPI ver 2.0 does allow for dynamic task creation but there are no current implementations that are stable. Should be some soon. Implicit vs. Explicit Parallelism Implicit - You don't have to change your programming style. You make a library call to a subroutine and the subroutine does all the necessary work to execute in parallel on the machine.
Queues insure the fair use of computer resources.
Any job that runs for more than 10 minutes must be run in the queues. Any job found running outside of the queues will be terminated without warning. The batch scheduling system on the SP-2 is called LoadLeveler TM Uses a specially formatted text file that describes the resource requirements for the batch job. Has both a command line interface and a graphical interface. Submit the file to the LoadLeveler system and it schedules the job.