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39. Time and Performance

39.1 Which Time Is It?

When we talk about "time" on UNIX systems, we could be talking about two things:

  1. What time it is, as shown by the date (51.10 ) command, and recorded in countless ways - as file creation and modification times, as the time of last login, and so on.

  2. How long things take.

This chapter is concerned with the latter. It talks about how long programs take to run, what makes them faster or slower, and what you can (or more often can't) do about it.


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