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How to interact with a Perl program while it is processing data

If you have a long running program, how do you monitor its progress?

You could use tail -f on an output file ... but there are other options too.

a) You can output a progress line; there's an example of this from the recent Perl for Larget Projects course ... [here].

b) You can trap ^C ... and even have it generate a report (that's included in the same example)

c) You can set up your process to arrange to dump out "results to date" if you send it a signal. That too is imlemented in the same example, and the program that sends the signal is [here]

Lots of tricks / comments / specifics I could tell you about in the example. If it's not obvious how it works, take a look at the course ;-)
(written 2011-07-31)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
P667 - Perl - Handling Huge Data
  [3374] Speeding up your Perl code - (2011-07-30)
  [2834] Teaching examples in Perl - third and final part - (2010-06-27)
  [2806] Macho matching - do not do it! - (2010-06-13)
  [2805] How are you getting on? - (2010-06-13)
  [2376] Long job - progress bar techniques (Perl) - (2009-08-26)
  [1924] Preventing ^C stopping / killing a program - Perl - (2008-12-05)
  [1920] Progress Bar Techniques - Perl - (2008-12-03)
  [1397] Perl - progress bar, supressing ^C and coping with huge data flows - (2007-10-20)
  [975] Answering ALL the delegate's Perl questions - (2006-12-09)
  [762] Huge data files - what happened earlier? - (2006-06-15)
  [639] Progress bars and other dynamic reports - (2006-03-09)


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