Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
My question is: what guidelines you have used for determining what is logged at each debug level?

I've built logging into several enterprise systems to support diagnosis in the field, and have always used simple numeric levels. It's a lot more convenient to write   log("diagnostic stuff") if $DEBUG > 1; (or the equivalent from Log::Dispatch::Config) than it is to wrestle with symbolic names for levels.

Stay simple, and don't get too hung up with a rigid numbering schemes. I've gotten a lot of mileage out of the following:

  • Level 1 - all user input (clicks, gestures, text input)
  • Level 2 - "i'm here" from significant subroutines, plus any SQL queries that get executed
  • Level 3 - diagnostic info from significant algorithms, plus summarized results of any SQL queries
  • Level 4 - kitchen sink
All warning and error messages go into the log, unconditionally. Each log message is timestamped. That provides a cheap way of doing performance profiling.

95% of the time, turning on level 1 has been sufficient to gather enough info to reproduce the problem locally, if not make it glaringly evident just what had gone off the rails and why. It's amazing how hard it is to believe that users will try certain sequences of actions, or that certain sequence are even possible, until you see hard evidence in the logs.

In reply to Re: Determining debug levels by dws
in thread Determining debug levels by drewbie

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (3)
As of 2022-06-27 10:50 GMT
Find Nodes?
    Voting Booth?
    My most frequent journeys are powered by:

    Results (88 votes). Check out past polls.