One person had to add up 15 numbers which took them 35s.
Then two people performed the same task with different numbers. They could only communicate with each other through passing a sheet of paper. This took 34s for the final sum to be computed. Since we have 2 processors, we would expect the work to be done twice as fast but took the exact same amount of time. Due to communication overhead.
To reduce the latency in communication of the processors, move them closer together or improve the communication speed.
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rishabhasingh
How would moving them closer make things better? Also, from a programming perspective, if the communication protocol was pre-defined (aka the students could've spoken to each other before they knew that they could only communicate later via paper), that would also create a speedup.
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bstan
I think the point that was being made was that multiple factors contribute to communication overhead. Moving two communicating objects closer makes things better because it takes less time, but this decrease in time for processors may be negligible for processors on the same computer in comparison to other factors, as the time it takes would probably not be a substantial part of the overhead.
One person had to add up 15 numbers which took them 35s.
Then two people performed the same task with different numbers. They could only communicate with each other through passing a sheet of paper. This took 34s for the final sum to be computed. Since we have 2 processors, we would expect the work to be done twice as fast but took the exact same amount of time. Due to communication overhead.
To reduce the latency in communication of the processors, move them closer together or improve the communication speed.
This comment was marked helpful 0 times.
How would moving them closer make things better? Also, from a programming perspective, if the communication protocol was pre-defined (aka the students could've spoken to each other before they knew that they could only communicate later via paper), that would also create a speedup.
This comment was marked helpful 0 times.
I think the point that was being made was that multiple factors contribute to communication overhead. Moving two communicating objects closer makes things better because it takes less time, but this decrease in time for processors may be negligible for processors on the same computer in comparison to other factors, as the time it takes would probably not be a substantial part of the overhead.
This comment was marked helpful 0 times.