In this problem you are to compare reading a fi?le using asingle-threaded fi?le

Question

In this problem you are to compare reading a fi?le using asingle-threaded
fi?le server and a multithreaded server. It takes 15 msec to get arequest for
work, dispatch it, and do the rest of the necessary processing,assuming that
the data needed are in a cache in main memory. If a disk operationis needed,
as is the case one-third of the time, an additional 75 msec isrequired, during
which time the thread sleeps. How many requests/sec can the serverhandle if
it is single threaded? If it is multithreaded?

Explanation / Answer

Dear User, In the single-threaded case, the cache hits take 30 msec andcache misses take (15+75) 90 msec.

The weighted average is 2/3*15+1/3*90=40. Thus the mean requesttakes 60 msec and the server can do 1000/40 per

second.

For a multithreaded server , all the waiting for the disk isoverlapped, so every request takes 15 msec, and the server can

handle 1000/15= 66.66 requests per second I hope this will helps toyou

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