Clearly some X11 limit is reached here. We should break up the single polyline in a set of polylines. Cheers, Fons. On Mon, 2002-03-04 at 16:53, Colley, Tony wrote: > Hello again. > > 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 *** > > So I did a little testing with how many points it would work with. > > If I have 1048570 (or fewer) data points, everything works fine. > > If I have 1048571 data points, the graph is displayed fine, but I get the > following message: > Error in <RootX11ErrorHandler>: BadMatch (invalid parameter attributes) > (XID: 37750999, XREQ: 42) > > If I have 1048572 data points, the border/axes of the graph are displayed > fine, but there is no plot of the data, and I get the following message: > Error in <RootX11ErrorHandler>: BadLength (poly request too large or > internal Xlib length error) (XID: 0, XREQ: 65) > > If I have 1048573 (or more) data points, ROOT crashes and I get the same > error message as for 10^7 points. > > This failure limit is suspiciously close to 2^20 (1048576). > > Anyone else successful at plotting more than 2^20 data points? > > In case you don't have the original email that started this thread... I am > using TGraph for plotting the x,y data points. > > +------------------------------------------------+ > | Tony Colley ITT Industries A/CD | > | Modeling/Simulation Group Fort Wayne, IN USA | > +------------------------------------------------+ > | Using ROOT 3.03/02 on RedHat Linux 7.2 | > | Last CVS update: 26 Feb 2002 at 2218 GMT | > +------------------------------------------------+ > > > -----Original Message----- > From: Faine, Valeri [mailto:fine@bnl.gov] > Sent: Saturday, March 02, 2002 21:06 > To: 'Eddy Offermann '; 'Tony.Colley@itt.com ' > Cc: 'roottalk@pcroot.cern.ch ' > Subject: RE: [ROOT] Event handling or graphing huge datasets > > > > Hello Eddy, > > I am not sure you correct. > > It is true "TGraph::PaintGrapHist" does take in account the screen > resolution but ExecuteEvent. > see: > http://root.cern.ch/root/htmldoc/src/TGraph.cxx.html#TGraph:ExecuteEvent > > When one tries to move the graph (may be accidently, just the wrong mouse > button was pressed) this entails the graph of the all fNpoints > to be redrawn at least twice: The first time to clear the old graph position > and the second time to draw it at the new place. Each of 10^7 points is > drawn with 6 calls to TVirtualX::DrawLine sending at list 4 coordinate > numbers as an X11-message. This means just one touched > (occasionally) the middle button of the mouse the (4*2) * 2 * 6 * 10^7 > bytes will be sent out to X-terminal. I believe this may shock the > networking. > Assuming we have 10Mbit / sec network one can calculate that 10^10 / 10 ^7 > = 1000 sec per single mouse step (this assumes the X-terminal response time > is as fast as its networking connection) > > > > > -----Original Message----- > From: Eddy Offermann > To: Tony.Colley@itt.com > Cc: roottalk@pcroot.cern.ch > Sent: 2/26/02 12:46 PM > Subject: Re: [ROOT] Event handling or graphing huge datasets > > Hi Tony, > > Take a look at "void TGraph::PaintGrapHist" and scan for "lowRes". > You will see around line 2350 that if you draw the graph with option L > or P, > The number of data points is checked versus your screen resolution. > In case of many data points it will not draw every point but just > calculate the > average pixel position. 10^7 should not be a problem > > > Eddy A.J.M. Offermann > Renaissance Technologies Corp. > Route 25A, East Setauket NY 11733 > e-mail: eddy@rentec.com > http://www.rentec.com > > --- END OF INCLUDED MESSAGES --- > > \I'm not responsible for anything below this line/ > > ************************************ > If this email is not intended for you, or you are not responsible for the > delivery of this message to the addressee, please note that this message may > contain ITT Privileged/Proprietary Information. In such a case, you may not > copy or deliver this message to anyone. You should destroy this message and > kindly notify the sender by reply email. Information contained in this > message that does not relate to the business of ITT is neither endorsed by > nor attributable to ITT. > ************************************ -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7679480
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