Re: very slow drawing

From: Rene Brun (Rene.Brun@cern.ch)
Date: Sat Feb 06 1999 - 10:26:37 MET


Thomas Walter wrote:
> > Let me know the result.
> >
> Here they are:
> 
> Part1 of my macro fills the histograms, Part2 does some fits and in Part3
> the histograms are displayed and the ps-file is generated.
> 
> These are the results for interactiv root. See the big differencies
> between the RealTime and the CPUTime in Part 3:
> 
> Part 1  RealTime: 82.29  CPUTime: 79.39
> Part 2  RealTime: 1.97  CPUTime: 1.93
> Part 3  RealTime: 536.55  CPUTime: 36.53
> 
> And here the results gained with root -b:
> 
> Part 1  RealTime: 81.3  CPUTime: 79.8
> Part 2  RealTime: 1.99  CPUTime: 1.95
> Part 3  RealTime: 5.5  CPUTime: 4.6
> 
> As you can see, the second version is a factor 10 faster than the first
> one.
> 
> If I remember me correctly, this discrepancy already existed in Zuerich.
> I displayed the histograms over the ethernet-lan from one computer to
> another. So I guess, the problem isn't a slow link between Hamburg and
> Zuerich.
> 
> Thomas Walter

Thomas,
As I was expecting, your problem has nothing to do with Postscript.
it is a pure X11 problem. I am aware of performance problems in case
you run on a Solaris 2.6 machine and your X server is another machine
even on the same LAN. Are you running on a Solaris machine?
If yes, this problem should be investigated. It is not a Root problem.
Ian Bird from Jefferson Lab raised this problem some time ago.
I do not know if they found a solution.
As a simple test, could you try to run Netscape on your machine in
Zuerich
and try to use it from your display in Hamburg?

Rene Brun



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