Hello rooters, I have in fact two questions one leading to the second one : Question 1 : Using ROOT 4.00/08 with GDK on WIN2000 * Version 4.00/08 9 July 2004 * Compiled for win32. CINT/ROOT C/C++ Interpreter version 5.15.138, May 23 2004 I suspect a weird memory leak when drawing canvas : I have an application that display a few canvas (in fact 3) in which I draw and updates graphs and histograms over hours, meanwhile the memory usage of the application grows slowly but constantly ( from about 20 M to 100's of Meg, eventually crashing the system). I am quite confident with the rest of the code, because if I remove the drawing of the canvas (keeping creation/deletion of histograms and graphs), the leak doesn't appear, and because of the funniest part : If I iconify the 3 canvases (graphically using the mouse) the memory usage of the application suddently drops to very low (and to what I would expect the application memory usage to be; a few megs ), and then starts again to grow .... until I de-iconify and re-iconify again the canvases... It looks to me more like a GDK / microsoft-windows low level interaction than a root problem, did somebody have seen something equivalent ? Question 2 : I therefore tried a few things at home on Linux box; namely : macro1 : { TCanvas* c; int i; for (i=0; i< 10000; i++) { c = new TCanvas(); delete c; } } macro2 : { TH2D* h; int j; for (j=0; j<10000; j++ ) { h = new TH2D("h","h",1000,0,1,1000,0,1); delete h; } } macro1 shows a memory usage of root.exe that grows constantly, macro2 shows a (though oscillating ..) steady memory usage. Is this the expected behaviour ? eric
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