Hi,
I'm not 100% sure but this would make sense as the first answer to me:
the machine with 990 ticks should be experiencing time at
(990/1000) of real time
the machine with 1015 ticks should be experiencing time at
(1015/1000) of real time
The length of time it would take the two systems to go out of sync be 5
seconds would be:
(1015/1000)a - (990/1000)a = 5
where "a" is the time needed between syncs
so answer is 200 seconds
Sorry, but the I've not really got time to work out the second one right
now. I'll try and get back to it at some point if someone hasn't beaten
me to it ;-)
Thanks
Paul
fatma oymak wrote:
Dear all,
I have one problem....I couldnt find right answer...do you have any idea?
please please let me know
many thanks
fatma
"........Consider the behaviour of two machines in a distributed system.
Both have clocks that are supposed to tick 1000 times per millisecond. One
of them ticks 990 times per millisecond. The other ticks 1015 times per
millisecond. If the system designer want to guarantee that clocks of these
two machines never differ by more than 5 seconds, how often must be clocks
be re-synchronized? Supposing that all machines in this distributed systems
come from same manufacturer and the maximum drift rate is specified as 1.0%,
how often must the clocks of this system must be re-synchonized if the
system designers want to guarantee that clocks of these two machines never
differ by more than 5 seconds? Describe in steps how you get your
result......."
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