Re: very slow drawing

From: Thomas Walter (twalter@physik.unizh.ch)
Date: Fri Feb 05 1999 - 18:23:04 MET


Rene,

> > 
> > my root-macro executes very fast until it reaches the part,
> > where the postscript file is generated. The cpu-usage drops
> > from about 99% to less then 3%.
> > 
> 
> Thomas,
> In this part of the macro, you draw 400 histograms. This may take a long
> time
> depending how many channels you have per histogram and your options.

50*( 3 * 128 channels + 2 * 100 channels + 10 ch + 25 ch + 50 ch) 

> Is your Postcript file generated on an AFS disk?

No it is generated on the local scratch disk. 

> What is the size of the generated ps file?

2973 KB

But all this doesn't explain the very low cpu-usage. One further thing we
have to consider the display. I'm computing in Zuerich and displaying
in Hamburg over a ssh-connection. 

Is it possible, that root is waiting for some X11-messages? If this is the
case, is it possible to generate the ps-file without display the
histograms on X11?

Thomas



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