Choose the correct option from amongst the below given: I.
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Choose the correct option from amongst the below given:**
I. A common memory is provided for all processors in a tightly coupled multiprocessor system.
II. In a tightly coupled multiprocessor system, jobs from all processors are processed in the same pool.
III. In a loosely coupled multiprocessor system, each processor has a private queue for processing its own jobs.
IV. Memory is shared amongst all processors in a loosely coupled multiprocessor system.
Show answer & explanation
Tightly coupled systems share common memory (I) and have a unified job pool processed by all processors (II). Loosely coupled systems have each processor maintain its own private job queue (III), but do NOT share memory—each processor has its own private memory. Statement IV is false because loosely coupled systems are characterized by memory isolation, not sharing.
Step-by-step Derivation:
Analyzing each statement:
I. Tightly coupled multiprocessor: TRUE — All processors access a shared, global memory space. This is the defining characteristic that enables tight coupling.
II. Tightly coupled multiprocessor: TRUE — Since memory and resources are shared, all processors can access a common job queue/pool. Tasks can be dynamically assigned to any available processor.
III. Loosely coupled multiprocessor: TRUE — Each processor operates independently with its own private memory and job queue. Processors do not directly share data; communication happens via message passing.
IV. Loosely coupled multiprocessor: FALSE — Loosely coupled systems have distributed memory where each processor maintains its own private memory space. Memory is NOT shared; this is the opposite characteristic of tightly coupled systems.
Therefore, statements I, II, and III are correct. Answer: D