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Hazard (computer architecture):
In the computer architecture, a hazard is a possible problem that can occurs in a pipelined processor. It concern to the possibility of erroneous computation when a CPU tries to simultaneously execute multiple instructions which exhibit data dependence. There are typically 3 types of hazards:1) branching hazards 2) structural hazards and 3) data hazards (control hazards).
Instructions in a pipelined processor are executed in various stages, so that at any given time many instructions are being executed, and instructions cannot be completed in the required order.
A hazard takes place when two or more of these simultaneous (possibly out of order) instructions conflict.
i) Data hazards
a)RAW - Read After Write
b) WAR - Write After Read
c) WAW - Write After Write
ii) Structural hazards
iii) Branch (control) hazards
iv) Eliminating hazards
a)Eliminating data hazards
b) Eliminating branch hazards
What is virtual memory? Method that automatically move program and datablocks into the physical main memory when they are needed for execution are known as virtual memory.
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