Re: (ITS#5922) progress bar proposal

[hyc@symas.com]

mbackes@symas.com wrote:
> Full_Name: Matthew Backes
> Version: 2.4, head
> OS: any
> URL:
> Submission from: (NULL) (76.88.99.93)
>
>
> Here is a proposal for a progress bar reporting tool, to appear in
> slapadd and other long running tools.  A similar version was used
> previously in Symas's OpenLDAP 2.3 (CDS3) product.  This version is
> significantly more modular, so that alternative estimators and display
> systems may be added.
>
> By default, it displays a text bar showing activity, progress, percent
> completion, estimated time to completion, elapsed time, and speed in
> bytes of ldif per second.
>
> The display functions are modular so that we could add a running trace
> of numbers that a graphical front-end might read and transform into
> pretty animated pie charts, or potentially fancier display within
> these tools.
>
> The default (and only) supplied display system currently relies only
> on carriage return, with no external libraries needed or dependencies
> on terminal features.
>
> Estimators are modular as well, as the default linear estimator can be
> frustratingly poor for very large, poorly tuned databases with
> extremely non-linear load times.
>
> Progress is estimated by fstat()ing the ldif file and ftell()ing to
> see the position.  As a result, ldif read from stdin automatically
> disables the progress bar.
>
> Files are available at:
>
> 	http://lirone.symas.net/lucca/progress-bar/
>
> * Apply progress.patch
> * Copy progress.c into libraries/liblutil/progress.c
> * Copy progress.h into include/progress.h

progress seems a bit too generic; the names probably should be prefixed with 
lutil. Also I suggest using "meter" instead of "progress".

lutil-meter.h, meter.c.

> We should probably make this configurable via the commandline (on/off,
> as well as which display and estimator systems to use), but currently
> it is always on provided stderr is a tty and the ldif is a file.

-- 
   -- Howard Chu
   CTO, Symas Corp.           http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/