Before you can decide what solution is best (and before we can give anything other than vague recommendations), the following questions need to be answered:
- To estimate time left, you need a way to estimate the total time of the process? How do you plan to do that?
- If estimated time is proportional to some units (e.g. bytes transfered), what are those unit and how do you measure them?
- Sometimes initial estimates can be horribly wrong and need to be readjusted. Does this fit your case, and if so, what algorithm will you use to do the readjustment? More specifically, what information does that algorithm rely on? Do you need a solution that will let you adjust the expected time for the process?
- Does the interface for displaying the time lapsed/time to completion matter? Do you want a GUI interface? Is a line to stdout/stderr enough?
The tools you have listed do not answer those questions.
Time::Elapse provides a simple functional interfaces for lapsed time but does not tell you what time remains. Time::Progress provides an object that tracks lapsed time and compares it to time for completion. It provides some methods for setting and revising estimates, but doesn't do the estimating for you.
Best, beth
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