On 06/15/2011 01:15 PM, zb wrote:
HiYou could try the example here: http://matplotlib.sourceforge.net/examples/user_interfaces/embedding_in_qt4.html Look at the memory grow. It does the same in my program.
I added a call to cbook.report_memory, and shortened the timer to 0.1 seconds in the attached version.
There is no memory leakage evident when I run this on my system. Eric
Cheers --- On *Wed, 6/15/11, Eric Firing /<efir...@hawaii.edu>/* wrote: From: Eric Firing <efir...@hawaii.edu> Subject: Re: [Matplotlib-users] canvas.draw() + pyqt4 memory leak To: matplotlib-users@lists.sourceforge.net Date: Wednesday, June 15, 2011, 6:33 PM On 06/15/2011 12:13 PM, zb wrote: > Hi > > I have a loop that updates a graph by calling > > self.fig.canvas.draw() > > But every time it updates the graph, the memory usage goes up. If the > program runs for one hour, the memory is gone (things start to run slow > too). I've tried to close() objects but the only thing that brings back > the ram memory is to close the whole application. > > I have read this note in the documentation (but it applies to pyplot): > > "If you are making a long sequence of figures, you need to be aware of > one more thing: the memory requiredfor a figure is not completely > released until the figure is explicitly closed with close(). Deleting > all references to the figure, and/or using the window manager to kill > the window in which the figure appears on the screen, is not enough, > because pyplot maintains internal references until close() is called." > > What could I do in pyqt4 to release the memory? > > Thanks Please provide a simple standalone script that demonstrates the problem. Eric
#!/usr/bin/env python # embedding_in_qt4.py --- Simple Qt4 application embedding matplotlib canvases # # Copyright (C) 2005 Florent Rougon # 2006 Darren Dale # # This file is an example program for matplotlib. It may be used and # modified with no restriction; raw copies as well as modified versions # may be distributed without limitation. import sys, os, random from PyQt4 import QtGui, QtCore from numpy import arange, sin, pi from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas from matplotlib.figure import Figure from matplotlib.cbook import report_memory progname = os.path.basename(sys.argv[0]) progversion = "0.1" class MyMplCanvas(FigureCanvas): """Ultimately, this is a QWidget (as well as a FigureCanvasAgg, etc.).""" def __init__(self, parent=None, width=5, height=4, dpi=100): fig = Figure(figsize=(width, height), dpi=dpi) self.axes = fig.add_subplot(111) # We want the axes cleared every time plot() is called self.axes.hold(False) self.compute_initial_figure() # FigureCanvas.__init__(self, fig) self.setParent(parent) FigureCanvas.setSizePolicy(self, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding) FigureCanvas.updateGeometry(self) def compute_initial_figure(self): pass class MyStaticMplCanvas(MyMplCanvas): """Simple canvas with a sine plot.""" def compute_initial_figure(self): t = arange(0.0, 3.0, 0.01) s = sin(2*pi*t) self.axes.plot(t, s) class MyDynamicMplCanvas(MyMplCanvas): """A canvas that updates itself every second with a new plot.""" def __init__(self, *args, **kwargs): MyMplCanvas.__init__(self, *args, **kwargs) timer = QtCore.QTimer(self) QtCore.QObject.connect(timer, QtCore.SIGNAL("timeout()"), self.update_figure) timer.start(100) def compute_initial_figure(self): self.axes.plot([0, 1, 2, 3], [1, 2, 0, 4], 'r') def update_figure(self): # Build a list of 4 random integers between 0 and 10 (both inclusive) l = [ random.randint(0, 10) for i in xrange(4) ] self.axes.plot([0, 1, 2, 3], l, 'r') self.draw() print report_memory() class ApplicationWindow(QtGui.QMainWindow): def __init__(self): QtGui.QMainWindow.__init__(self) self.setAttribute(QtCore.Qt.WA_DeleteOnClose) self.setWindowTitle("application main window") self.file_menu = QtGui.QMenu('&File', self) self.file_menu.addAction('&Quit', self.fileQuit, QtCore.Qt.CTRL + QtCore.Qt.Key_Q) self.menuBar().addMenu(self.file_menu) self.help_menu = QtGui.QMenu('&Help', self) self.menuBar().addSeparator() self.menuBar().addMenu(self.help_menu) self.help_menu.addAction('&About', self.about) self.main_widget = QtGui.QWidget(self) l = QtGui.QVBoxLayout(self.main_widget) sc = MyStaticMplCanvas(self.main_widget, width=5, height=4, dpi=100) dc = MyDynamicMplCanvas(self.main_widget, width=5, height=4, dpi=100) l.addWidget(sc) l.addWidget(dc) self.main_widget.setFocus() self.setCentralWidget(self.main_widget) self.statusBar().showMessage("All hail matplotlib!", 2000) def fileQuit(self): self.close() def closeEvent(self, ce): self.fileQuit() def about(self): QtGui.QMessageBox.about(self, "About %s" % progname, u"""%(prog)s version %(version)s Copyright \N{COPYRIGHT SIGN} 2005 Florent Rougon, 2006 Darren Dale This program is a simple example of a Qt4 application embedding matplotlib canvases. It may be used and modified with no restriction; raw copies as well as modified versions may be distributed without limitation.""" % {"prog": progname, "version": progversion}) qApp = QtGui.QApplication(sys.argv) aw = ApplicationWindow() aw.setWindowTitle("%s" % progname) aw.show() sys.exit(qApp.exec_()) #qApp.exec_()
------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev
_______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users