I read somewhere that it was good practice to factor out system overheads such as i/o when benchmarking algorithms

That may be a good rule of thumb, but -- as should now be obvious -- it doesn't apply all the time. In this case, the I/O is part of what we're testing. Factoring it out alters the algorithm significantly.

In reply to Re^6: removing duplicate lines by revdiablo
in thread removing duplicate lines by Anonymous Monk

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