Re: [xslt] xslt callgraph

[Stefan Kost <ensonic hora-obscura de>]

Stefan Kost wrote:
> hi,
>
> xsltproc --profile is quite helpful to find out in which parts of xsl
> style sheets most time ist spend. Now if one want to optimize that there
> are always two ways:
> 1.) make the hostspots use less cpu
> 2.) avoid calling expensive functions
>
> For that a callgraph is useful. WHen using oprofile to profile code I
> use this script [1] to render the call graph. The script could easily
> adapted to render a xslt callgraph if xsltproc could output the needed data.
>   
Talk is cheap, but here is a patch:
https://bugzilla.gnome.org/show_bug.cgi?id=612186

What I don't like so much still:
1) it needs a small hack fro gprof2dot - I am discussing with the author
already
2) could someone tell me where to properly free the profile arrays in
xsltTemplate?
3) I'd like to print the function index (like in gprof), but for that I
would need to know the origin for each template (source:file)
  probably via templ->style->doc->URL and templ->elem->line

Comment welcome
Stefan

> Right now output of --profile is like this:
> number               match                name      mode  Calls Tot
> 100us Avg
>
>     0                         gentext.template           120292
> 1356556     11
>     1                                    chunk           118816
> 457122      3
>     2                    *                    recursive-chunk-filename
>
> In oprofile orreport --c (callgraph) output looks like this:
>
> samples  %        image name               app name                
> symbol name
> -------------------------------------------------------------------------------
>   36       100.000  /usr/lib/libgtk-x11-2.0.so.0.1800.3
> /usr/lib/libgtk-x11-2.0.so.0.1800.3 gtk_main_do_event
>   0              0  /usr/lib/libgtk-x11-2.0.so.0.1800.3
> /usr/lib/libgtk-x11-2.0.so.0.1800.3 gtk_propagate_event
>   41       97.6190  /usr/lib/libgtk-x11-2.0.so.0.1800.3
> /usr/lib/libgtk-x11-2.0.so.0.1800.3 gtk_widget_event_internal
>   1         2.3810  /usr/lib/libgdk-x11-2.0.so.0.1800.3
> /usr/lib/libgtk-x11-2.0.so.0.1800.3 gdk_window_is_viewable
>   0              0  /usr/lib/libgtk-x11-2.0.so.0.1800.3
> /usr/lib/libgtk-x11-2.0.so.0.1800.3 gtk_propagate_event [self]
> -------------------------------------------------------------------------------
>
> Would it be possible for xsltproc to output something similar? E.g.
>
> %        name
> -------------------------------------------------------------------------------
>   100       gentext.template
>   78         chunk
>   ...
> -------------------------------------------------------------------------------
> <next entry>
>
>
> Stefan
>
> [1] http://code.google.com/p/jrfonseca/wiki/Gprof2Dot
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