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Programming support of tightly-coupled multiprocessing hardware has been discussed, particularly the OS/VS2 Release 2 components: locking, service management, CPU affinity, dispatching, and alternate CPU recovery. These facilities improve the control program utilization of the two-cpu environment in that it can now run parallel disable functions. Alsos, pin time on locks is reduced, and the new dispatchable unit allows more parallelism in new system functions. Furthermore, the system is able to recover from the loss of one of the two CPUS.
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