PSPP-BUG: [bug #24726] scrolling lags/needs performance profiling

[jeff]

URL:
  <http://savannah.gnu.org/bugs/?24726>

                 Summary: scrolling lags/needs performance profiling
                 Project: PSPP
            Submitted by: kiddo
            Submitted on: dim 02 nov 2008 13:01:23 GMT
                Category: Graphical User Interface
                Severity: 5 - Average
                  Status: None
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
                  Effort: 0.00

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Details:

In 0.6.1, both the variable view and data view lag a lot when scrolling.
Actually, you can scroll, let go of the touchpad scrollbar, and look at pspp
keep scrolling for 10 seconds or so :) this is not the case with, say,
gnumeric (or even OOo Calc).

If this happens on a small dataset (575 variables, 8 cases), I'm worried
about what kind of performance problems would appear with large ones.

My non-developer guess is that the pspp gui must be doing unnecessary work,
like repainting all the rows/columns on each scroll step, or something along
those lines. At least, when I scroll, I noticed that it seems to scroll one
line at a time, and things "flicker" (such as the column/row headers).

Maybe this could be profiled using sysprof/systat, but I lack the
knowledge/skill to do that.

Some interesting profiling reference material, if you haven't seen them
already: 

http://ftp.belnet.be/mirrors/FOSDEM/2007/FOSDEM2007-ProfilingDesktopApplication.ogg

http://www.gnome.org/~federico/docs/2005-GNOME-Summit/html/index.html

http://www.gnome.org/~federico/docs/2006-GUADEC/how-much-faster/index.html




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