RE: [ROOT] Event handling or graphing huge datasets

From: Jacek M. Holeczek (holeczek@us.edu.pl)
Date: Mon Mar 04 2002 - 17:36:09 MET


My 5 cents.

> I was mistaken... I was accidently testing with 10^6 points and not 10^7
> points. That extra order of magnitude causes a crash in ROOT with the
> following message:
> 
>   *** BREAK *** write on a pipe with no one to read it
>   Error in <RootX11IOErrorHandler>: fatal X11 error (connection to server
> lost?)
>   *** Save data and exit application ***

Please see my earlier mail :
	http://root.cern.ch/root/roottalk/roottalk02/0561.html
I also observed a root crash as soon as more then about 1e7 events were
used in "SetEstimate". No solution has been offered / found.
The visual effect was that the "Draw" command exited giving the proper
number of events (4390625), the canvas was drawn with correct axises (both
x- and y-axis limits were o.k.), but no points were drawn and a moment
later the canvas was closed and I got the error that you saw.

I suspected that there was somewhere a "float" instead of a "double", so
that "1e7" is the same as "1e7 + 1".

Best regards,
Jacek.



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