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The SYSGEN parameter MULTITHREAD limits the maximum number of kernel threads per process. It is set by AUTOGEN to the number of CPUs on the system. If MULTITHREAD is set to zero (0), two-level scheduling support is disabled, and DECthreads reverts to pre-Version 7.0 behavior: no upcalls will occur, and DECthreads will not utilize all processors in multiprocessor systems.