In this problem you are to compare reading a file using a single-threaded file server and a multithreaded server. It takes 12 msec to get a request for work, dispatch it, and do the rest of the necessary processing, assuming that the data needed are in the block cache. If a disk operation is needed, as is the case one-third of the time, an additional 75 msec is required, during which time the thread sleeps. How many requests/sec can the server handle if it is single threaded? If it is multithreaded?

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07-02-2020
Computers and Technology

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In this problem you are to compare reading a file using a single-threaded file server and a multithreaded server. It takes 12 msec to get a request for work, dispatch it, and do the rest of the necessary processing, assuming that the data needed are in the block cache. If a disk operation is needed, as is the case one-third of the time, an additional 75 msec is required, during which time the thread sleeps. How many requests/sec can the server handle if it is single threaded? If it is multithreaded?

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ammary456 ammary456 · Answer 1 · 2020-02-14T13:53:17+01:00

ammary456 ammary456

14-02-2020

The answer & explanation for this question is given in the attachment below.

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Cricetus Cricetus · Answer 2 · 2021-12-13T08:51:04+01:00

Every request will take 12 msec, as well as the server could then handle 83.33 requests per second.

So, throughout the single-threaded example, cache successes take 12 milliseconds as well as memory misses consuming 72 milliseconds.

Now,

The weighted average will be:

= [tex]\frac{3}{4} \times 12+\frac{1}{4} \times 72[/tex]

= [tex]9+18[/tex]

= [tex]27[/tex]

It can handle about 37 queries per second. Every one of them having to wait for something like the disc on a multithreaded server involves overlapping.

Thus the above response is correct.

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