Parallel Virtual Machine (PVM) allows that a cluster of heterogeneous computers can be perceived as a large virtual machine. This paper describes a mechanism implemented on PVM that allows the execution of “batch processes”, which in order to accomplish a more efficient resource usage, it is able to detect the instant when each one of the tasks finishes. The new functionality and the message protocol included to PVM are explained in detail. Since the proposed daemons can coexist with the standard daemons of PVM, the compatability with the existing functionality of PVM is guaranteed. It is also described the suggested procedure for including new functionality to PVM.
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