Tips and tricks
From Gerris
| Revision as of 21:49, 27 August 2007 Popinet (Talk | contribs) (compressed files tip) ← Previous diff |
Revision as of 17:05, 29 January 2008 Rohtav (Talk | contribs) Next diff → |
||
| Line 37: | Line 37: | ||
| GfsView can read compressed GFS files directly. | GfsView can read compressed GFS files directly. | ||
| + | |||
| + | == Writing generic or customized output == | ||
Revision as of 17:05, 29 January 2008
Contents |
Emacs mode for Gerris files
Well, not really but something approaching. Add the following to your .emacs
(setq auto-mode-alist (cons '("\\.gfs\\'" . shell-script-mode) auto-mode-alist))
Generating several movies on-the-fly
While it is fairly simple to use the scripting mode of gfsview and unix pipes to generate a movie on the fly from a running simulation, how does one generate several movies simultaneously?
Using named unix fifos and the tee utility it is fairly easy too. For example if one has three gfsview files called wide.gfv, closeup.gfv and overview.gfv and want to generate the three corresponding movies wide.mpg, closeup.mpg and overview.mpg in one go, one could use the following script:
#!/bin/sh
movies="wide closeup overview"
rm -f $movies
mkfifo $movies
gerris3D mysimulation.gfs | tee $movies > /dev/null &
for movie in $movies; do
gfsview-batch3D $movie.gfv < $movie | ppm2mpeg > $movie.mpg &
done
sleep 10
rm -f $movies
of course the simulation file mysimulation.gfs should contain lines looking like:
OutputSimulation { istep = 10 } stdout
EventScript { istep = 10 } { echo "Save stdout { width = 1024 height = 768 }" }
Compressing simulation files
When it is useful to save simulation results at regular intervals, the size of the files can be reduced by using on-the-fly compression. This can be done like this:
OutputSimulation { istep = 100 } sim-%ld.gfs
EventScript { istep = 100 } { gzip -f -q sim-*.gfs }
GfsView can read compressed GFS files directly.
