> > It seems that this discussion raises a very important issue, related to the > design of ROOT low-level graphics. > > - ROOT uses raster (as opposite to vector) graphics, it is pixmaps and not > X11 "draw primitive" commands which are being passed over the network. > Passing pixmaps over the network is not the most time-efficient way > of displaying the graphics images. I think that this explains the problems > experienced by Thomas. > This was exactly the answer I was looking for. And with Renes straight tip to use root in the batch-mode, I'm satisfied. > It takes me 10 seconds and even more to redraw a simple canvas > when I'm working from home using X-terminal over the modem (28K) connection. > In this mode there is a drastic difference in performance between ROOT > and PAW graphics with PAW graphics being many (5-10) times faster. > Redrawing of more complex event displays takes minutes. > > - any graphics system which is required to be efficient over the network has > to work in client-server mode with the drawing commands and not pixmaps > travelling across the ocean. If I remember it correctly a work on the > implementation of client-server graphics mode for ROOT has started some > time ago but I don't know where the things stand right now. Client-server > mode won't help people using X-terminals, but as these are becoming less > and less popular, I don't think it is a serious issue. > This would be a big improvement. > - several big experiments (with Tevatron experiments among them) are planning > to take data in the year of 2000, there definitely > be a lot of physicists using event display programs in the distributed > environment (over the LAN's and WAN's), the issue of performace is a very > important one, so it make sense to have a special discussion of client-server > graphics mode at the ROOT user workshop planned at Fermilab in the end of March. > > -pasha > Thanks a lot to everybody contributing to this thread. Thomas Walter
This archive was generated by hypermail 2b29 : Tue Jan 04 2000 - 00:43:29 MET