Memory leak when using PySide instead of PyQt

afilash

Hi, I am using pyqtgraph to display a simple sine wave form. Which works perfectly with PyQt4. ( using windows 7 , python 2.7 ) when we check task manager, the memory occupied by running python instant stays steady. But if i use PySide instead of PyQt, the memory taken by the python instance starts climbing up! This is my code

@
import sys

#from PyQt4 import QtGui
#from PyQt4 import QtCore

from PySide import QtGui
from PySide import QtCore

import numpy as np
import pyqtgraph as pg

class GraphDisplay(QtGui.QMainWindow):

def __init__( self , parent =None):
    QtGui.QMainWindow.__init__ (self , parent)
    self.setGeometry( QtCore.QRect(200, 100 , 1000, 300 ))
    
    self.framelength = 400
    self.flowwindow = 2
    self.index =0
    self.indexmax = (1000 -  self.framelength) / self.flowwindow
    self.dataPlot = np.cos(np.linspace(0, 10*np.pi , 1000))

    self.graph = pg.PlotItem()
    self.graph.plot( self.dataPlot)
    self.graph.showGrid(x=True, y=True)
    
    
    self.view = pg.GraphicsView()
    self.view.setCentralItem(self.graph)
    self.setCentralWidget(self.view)
    
    self.timer = QtCore.QTimer()
    self.timer.timeout.connect(self.UpdatePlotData)
    self.timer.start(200)


def UpdatePlotData(self):
    self.index += 1
    if (self.indexmax == self.index):
        self.index = 0         
    self.graph.clear()
    #print self.graph.plot(self.dataPlot[ self.index * self.flowwindow : self.framelength + self.index * self.flowwindow], pen=(0,255,0) , clear=True)
    self.graph.plot(self.dataPlot[ self.index * self.flowwindow : self.framelength + self.index * self.flowwindow], pen=(0,255,0) , clear=True)

def ShowWindow():
app = QtGui.QApplication(sys.argv)
qb = GraphDisplay()
qb.show()
sys.exit(app.exec_())

if name == 'main':
ShowWindow()

if we apply the print statement on line 44 and comment line 45 we get the console result like this

@For PyQt4
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem object at 0x04118F60>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem object at 0x04118F60>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem object at 0x04118F60>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem object at 0x04118F60>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem object at 0x04118F60>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem object at 0x04118F60>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem object at 0x04118F60>

For PySide
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem(this = 0x3bbe560 , parent = 0x355ca50 , pos = QPointF(0, 0) , z = 0 , flags = ( ItemHasNoContents ) ) at 0x03A8D738>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem(this = 0x3bbd8b8 , parent = 0x355ca50 , pos = QPointF(0, 0) , z = 0 , flags = ( ItemHasNoContents ) ) at 0x03AA9828>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem(this = 0x3bbebf0 , parent = 0x355ca50 , pos = QPointF(0, 0) , z = 0 , flags = ( ItemHasNoContents ) ) at 0x03A8D738>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem(this = 0x3bbd888 , parent = 0x355ca50 , pos = QPointF(0, 0) , z = 0 , flags = ( ItemHasNoContents ) ) at 0x03AA9828>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem(this = 0x3bbec38 , parent = 0x355ca50 , pos = QPointF(0, 0) , z = 0 , flags = ( ItemHasNoContents ) ) at 0x03A8D738>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem(this = 0x3bbc190 , parent = 0x355ca50 , pos = QPointF(0, 0) , z = 0 , flags = ( ItemHasNoContents ) ) at 0x03AA9828>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem(this = 0x3bbc2c8 , parent = 0x355ca50 , pos = QPointF(0, 0) , z = 0 , flags = ( ItemHasNoContents ) ) at 0x03A8D738>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem(this = 0x3bbbe48 , parent = 0x355ca50 , pos = QPointF(0, 0) , z = 0 , flags = ( ItemHasNoContents ) ) at 0x03AA9828>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem(this = 0x3bbcb38 , parent = 0x355ca50 , pos = QPointF(0, 0) , z = 0 , flags = ( ItemHasNoContents ) ) at 0x03A8D738>
<pyqtgraph.graphicsItems.PlotDataItem.PlotDataItem(this = 0x3bbe068 , parent = 0x355ca50 , pos = QPointF(0, 0) , z = 0 , flags = ( ItemHasNoContents ) ) at 0x03AB5E90>@

The memory location at which the object is created getting changed on each iteration. Is there any way to avoid memory leak ? Please help.

afilash

I think this is not the problem with pyqtgraph, please see this,
"reply from pyqtgraph maintainer":https://groups.google.com/forum/?fromgroups=#!topic/pyqtgraph/3LcTnVRKcbo