In one of the text book its mentioned that 'running time of this algorithm is 200 computer years'. Can somebody please explain what is the meaning of a computer year?

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    $\begingroup$ Which textbook? Most likely a computer year means a year of running the computer working on the problem. $\endgroup$ Apr 11, 2013 at 10:20
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    $\begingroup$ 2oo times the distance a usual computer travels during a single year ;). Probably some number of instructions, based on some average instructions per second. $\endgroup$
    – frafl
    Apr 11, 2013 at 10:21
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    $\begingroup$ It's like dog years, i.e. a measure of time used to approximate the equivalent age of a computer in terms of an average human's life span. Since most computers/humans are put out of work after 3/65 years, a computer year is roughly 17 days. Or am I doing this wrong? $\endgroup$
    – Pedro
    Apr 11, 2013 at 11:30

1 Answer 1


Computer years, like man hours, are a measure of work. A computer year is the work one computer (of some agreed-upon speed...) performs in a year. 365 computers working in parallel for a day also perform one computer year of work.


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