Question

Q.1 what are interrupts in operating system.
Q.2 Describe the performance of cache memory with its three types .​

Answer 1

Answer:

1.

• Interrupts are signals sent to the CPU by external devices, normally I/O devices.
• They tell the CPU to stop its current activities and execute the appropriate part of the operating system.
• Hardware Interupts are generated by hardware devices to signal that they need some attention from the OS.

2.

• CACHE is a reserved access area of the main memory or of a storage device.
• As mentioned, cache is a high-speed reserved area of the main memory that can be used to access information.
• There are basically two types of cache: memory cache and disk cache.
• Memory cache is a part of the high speed SRAM(Static Random Access Memory). In the memory cache, the computer keeps the frequently accessed information so that information retrieval may be faster and more efficient.
• Disc cache memory also relates to frequently accessed information but instead of the SRAM, this cache reserves a part of the conventional main memory.
• So, more frequently used data from the disc is stored in a memory buffer. Any information retrieved from the disc is first checked in the memory buffer and if found there, the retrieval is considerably faster.

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