Computer Science - Computer Fundamentals - Discussion

On the level of machine language, the operation of the CPU is fairly straightforward. The CPU executes a program that is stored as a sequence of machine language instructions in main memory.

It does this by repeatedly reading, or fetching, an instruction from memory and then carrying out, or executing, that instruction. This process -- fetch an instruction, execute it, fetch another instruction, execute it, and so on forever -- is called the fetch-and-execute cycle.

Seek time:
The time it takes for a disk drive to move its head (s) from one track to another. The seek time depends on the power of the servo, the mass of the heads, the number of tracks traversed and the time taken to position the heads over the target track accurately enough to start data transfer.

Delay time:
A period between the application of an input and the beginning of the response.

Seek time - time taken for an access arm to get into position over a particular track.

Head switching - this is the activation of a particular read and write head over a particular track.

Rational delay - time for waiting until the desired data on the track rotates under the read and write head.

The execution of a single instruction occurs by instruction cycle. Instruction Cycle is a 8-stage procedure. To know about instruction cycle refer computer organization and architecture by William Stallins.

@Ritu.

The process of fetching the data from the memory and executing the data is called as a complete CPU cycle.

SEEK TIME==>when the rotation head searches the particular data in disc.

Real time is a level of computer responsiveness that a user senses as sufficiently immediate or that enables the computer to keep up with some external process.

For a single instruction there is only 1 cpu cycle responsible for that instruction, it is a three phase cycle: fetch-decode-execute.

A narrative technique whereby events are depicted as occurring entirely within the span of and at the same rate as the depiction.

Another information:

CPU cycle is related to frequency.

f=1/cpu cycle. (unit=Hz)

Could you explain the seek time and real time and delay time?