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Thread: [PyQt4] QTreeView performance issue

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  1. 5th November 2012, 19:58 #1
    norobro
    norobro is offline Advanced user
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    Default Re: [PyQt4] QTreeView performance issue

    Are you running cProfile from the command line? i.e. python -m cProfile "scriptname"
    I get similar results that way.

    Try running it from your script:
    Qt Code: 
    1. from PyQt4.QtCore import *
    2. from PyQt4.QtGui import *
    3. from random import shuffle
    4. from time import clock
    5. import cProfile
    6. import pstats
    7.  
    8. class TreeItem(object) :
    9. . . .
    10. . . .
    11. if __name__ == "__main__" :
    12.     import sys
    13.     a = QApplication(sys.argv)
    14.     dia = Frame(None)
    15.     dia.resize(400, 600)
    16.     dia.show()
    17.     cProfile.run('a.exec_()', 'profdata')
    18.     p = pstats.Stats('profdata')
    19.     p.sort_stats('calls').print_stats()
    20. #    a.exec_()
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  2. 5th November 2012, 22:54 #2
    Gad82
    Gad82 is offline Beginner
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    Default Re: [PyQt4] QTreeView performance issue

    Yes, I was running cProfile from command line; I executed the profiling as you suggested and I got values more similar to yours:

    Qt Code: 
    1. 1070281 function calls in 11.630 seconds
    2.  
    3.    Ordered by: call count
    4.  
    5.    ncalls  tottime  percall  cumtime  percall filename:lineno(function)
    6.    999999    0.102    0.000    0.102    0.000 {method 'random' of '_random.Random' objects}
    7.     12766    0.003    0.000    0.003    0.000 {built-in method internalPointer}
    8.     10632    0.005    0.000    0.005    0.000 {built-in method isValid}
    9.      6793    0.019    0.000    0.019    0.000 {built-in method createIndex}
    10.      3388    0.001    0.000    0.001    0.000 {len}
    11.      3375    0.002    0.000    0.003    0.000 C:\Users\massimiliano\Desktop\t.py:45(childCount)
    12.      3375    0.002    0.000    0.002    0.000 {built-in method column}
    13.      3321    0.009    0.000    0.015    0.000 C:\Users\massimiliano\Desktop\t.py:126(rowCount)
    14.      2961    0.001    0.000    0.001    0.000 C:\Users\massimiliano\Desktop\t.py:42(child)
    15.      2961    0.001    0.000    0.001    0.000 C:\Users\massimiliano\Desktop\t.py:89(columnCount)
    16.      2961    0.014    0.000    0.056    0.000 C:\Users\massimiliano\Desktop\t.py:106(index)
    17.      2961    0.017    0.000    0.031    0.000 {built-in method hasIndex}
    18.      2590    0.021    0.000    0.078    0.000 C:\Users\massimiliano\Desktop\t.py:80(_ItemFromIndex)
    19.      2590    0.008    0.000    0.086    0.000 C:\Users\massimiliano\Desktop\t.py:92(data)
    20.      2520    0.001    0.000    0.001    0.000 {built-in method row}
    21.      1706    0.001    0.000    0.001    0.000 C:\Users\massimiliano\Desktop\t.py:57(parent)
    22.      1706    0.009    0.000    0.019    0.000 C:\Users\massimiliano\Desktop\t.py:114(parent)
    23.      1312    0.002    0.000    0.003    0.000 C:\Users\massimiliano\Desktop\t.py:60(row)
    24.      1312    0.001    0.000    0.001    0.000 {method 'index' of 'list' objects}
    25.       370    0.000    0.000    0.000    0.000 C:\Users\massimiliano\Desktop\t.py:51(data)
    26.       370    0.002    0.000    0.002    0.000 C:\Users\massimiliano\Desktop\t.py:97(flags)
    27.        54    0.000    0.000    0.000    0.000 C:\Users\massimiliano\Desktop\t.py:100(hasChildren)
    28.        28    0.000    0.000    0.000    0.000 C:\Python27\lib\idlelib\rpc.py:149(debug)
    29.        20    0.000    0.000    0.000    0.000 {thread.get_ident}
    30.        20    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:63(_note)
    31.        16    0.061    0.004    0.061    0.004 {method 'acquire' of 'thread.lock' objects}
    32.         8    0.000    0.000    0.000    0.000 {method 'release' of 'thread.lock' objects}
    33.         8    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:58(__init__)
    34.         8    0.000    0.000    0.000    0.000 {thread.allocate_lock}
    35.         8    0.000    0.000    0.000    0.000 {isinstance}
    36.         8    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:826(currentThread)
    37.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:141(release)
    38.         4    0.000    0.000    0.000    0.000 {getattr}
    39.         4    0.000    0.000    0.000    0.000 {method 'get' of 'dict' objects}
    40.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:186(__init__)
    41.         4    0.000    0.000    0.061    0.015 C:\Python27\lib\threading.py:235(wait)
    42.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:159(_acquire_restore)
    43.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:167(_release_save)
    44.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\idlelib\rpc.py:317(newseq)
    45.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:177(_is_owned)
    46.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:101(RLock)
    47.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\socket.py:223(meth)
    48.         4    0.000    0.000    0.062    0.015 C:\Python27\lib\idlelib\rpc.py:279(getresponse)
    49.         4    0.000    0.000    0.001    0.000 C:\Python27\lib\idlelib\rpc.py:218(asynccall)
    50.         4    0.000    0.000    0.062    0.015 C:\Python27\lib\idlelib\rpc.py:295(_getresponse)
    51.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:106(__init__)
    52.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\idlelib\rpc.py:244(decoderesponse)
    53.         4    0.000    0.000    0.000    0.000 {select.select}
    54.         4    0.000    0.000    0.062    0.015 C:\Python27\lib\idlelib\rpc.py:238(asyncreturn)
    55.         4    0.000    0.000    0.000    0.000 {_struct.pack}
    56.         4    0.000    0.000    0.001    0.000 C:\Python27\lib\idlelib\rpc.py:321(putmessage)
    57.         4    0.000    0.000    0.063    0.016 C:\Python27\lib\idlelib\rpc.py:594(__call__)
    58.         4    0.000    0.000    0.063    0.016 C:\Python27\lib\idlelib\rpc.py:208(remotecall)
    59.         4    0.000    0.000    0.000    0.000 {cPickle.dumps}
    60.         4    0.000    0.000    0.000    0.000 {method 'fileno' of '_socket.socket' objects}
    61.         4    0.000    0.000    0.000    0.000 {method 'append' of 'list' objects}
    62.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\idlelib\rpc.py:546(__getattr__)
    63.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\idlelib\rpc.py:589(__init__)
    64.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\idlelib\rpc.py:287(_proxify)
    65.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:181(Condition)
    66.         4    0.001    0.000    0.001    0.000 {method 'send' of '_socket.socket' objects}
    67.         4    0.000    0.000    0.000    0.000 C:\Python27\lib\threading.py:121(acquire)
    68.         2    0.000    0.000    0.000    0.000 {time.clock}
    69.         2    0.000    0.000    0.000    0.000 {built-in method model}
    70.         1    0.003    0.003    0.003    0.003 {built-in method expand}
    71.         1    0.000    0.000    1.371    1.371 C:\Users\massimiliano\Desktop\t.py:142(Shuffle)
    72.         1   10.139   10.139   11.630   11.630 {built-in method exec_}
    73.         1    0.000    0.000   11.630   11.630 <string>:1(<module>)
    74.         1    1.203    1.203    1.305    1.305 C:\Python27\lib\random.py:276(shuffle)
    75.         1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}
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    To be honest, I really don't understand what's going on...
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