Results 1 to 3 of 3

Thread: Optimized Qt compilation

  1. 14th September 2015, 09:46 #1
    quimnuss
    quimnuss is offline Novice
    Join Date
    Jul 2015
    Posts
    52
    Thanked 1 Time in 1 Post
    Qt products
    Qt5
    Platforms
    Unix/X11 Windows

    Default Optimized Qt compilation

    I am building static Qt targeting a non very powerful single processor XP machine. (apparently Pentium III, Intel Pentium 1.10 GHz)

    I've managed to compile it but how can I build it with optimized flags /O3 etc. and what about sse2 and so on?

    The application is too slow and can't keep up with the sent signals sent at 1Hz.
    Reply With Quote Reply With Quote
  2. 14th September 2015, 10:07 #2
    anda_skoa
    anda_skoa is offline Administrator
    Nokia Certified Qt Developer
    Join Date
    Jan 2006
    Location
    Graz, Austria
    Posts
    8,416
    Thanks
    37
    Thanked 1,544 Times in 1,494 Posts
    Qt products
    Qt3 Qt4 Qt5
    Platforms
    Unix/X11 Windows

    Default Re: Optimized Qt compilation

    You can add to QMAKE_CFLAGS and QMAKE_CXXFLAGS in your .pro file.

    Also make sure you are doing actual profiling to check if any code paths can be written more efficiently.

    Cheers,
    _
    Reply With Quote Reply With Quote
  3. 14th September 2015, 11:59 #3
    quimnuss
    quimnuss is offline Novice
    Join Date
    Jul 2015
    Posts
    52
    Thanked 1 Time in 1 Post
    Qt products
    Qt5
    Platforms
    Unix/X11 Windows

    Default Re: Optimized Qt compilation

    Hello again anda_skoa, I'll definitely give you credit on the application About or something!

    You are talking about the project .pro, but I'm referring to the qt static library. I guess both can be optimized and I'm wondering about the latter.

    ATM I was going to compile Qt with the following options:

    Qt Code: 
    1. configure -static -static-runtime -no-harfbuzz -no-angle -no-opengl -no-openssl -no-freetype -no-ssl -release -opensource -confirm-license -mp -nomake examples -nomake tests -c++11 -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg -qt-freetype -skip webengine -skip webkit -skip webkit-examples -no-warnings-are-errors -sse4.2 -prefix C:\Qt\Static\msvc2xp -platform win32-msvc2013 -target xp
    To copy to clipboard, switch view to plain text mode 

    regarding the .pro, I'm adding Ox. I have to check which other flags does msvc have.

    Added after 1 18 minutes:


    I've found the mkspecs under qtbase, but nothing changes if I change, say, the compiler line.

    Which makespecs is 'configure' reading? How can I know?

    I'm running a shell with:

    Qt Code: 
    1. C:\Qt\Static\src\qt-everywhere-opensource-src-5.5.0>REM Set up \Microsoft Visual
    2.  Studio 2013, where <arch> is \c amd64, \c x86, etc.
    3.  
    4. C:\Qt\Static\src\qt-everywhere-opensource-src-5.5.0>CALL "C:\Program Files (x86)
    5. \Microsoft Visual Studio 12.0\VC\bin\vcvars32.bat" x86
    6.  
    7. C:\Qt\Static\src\qt-everywhere-opensource-src-5.5.0>SET _ROOT=C:\Qt\Static\src\q
    8. t-everywhere-opensource-src-5.5.0
    9.  
    10. C:\Qt\Static\src\qt-everywhere-opensource-src-5.5.0>SET PATH=C:\Qt\Static\src\qt
    11. -everywhere-opensource-src-5.5.0\qtbase\bin;C:\Qt\Static\src\qt-everywhere-opens
    12. ource-src-5.5.0\gnuwin32\bin;C:\Program Files (x86)\Microsoft Visual Studio 12.0
    13. \Common7\IDE\CommonExtensions\Microsoft\TestWindow;C:\Program Files (x86)\Micros
    14. oft SDKs\F#\3.1\Framework\v4.0\;C:\Program Files (x86)\MSBuild\12.0\bin;C:\Progr
    15. am Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\;C:\Program Files (x86)\
    16. Microsoft Visual Studio 12.0\VC\BIN;C:\Program Files (x86)\Microsoft Visual Stud
    17. io 12.0\Common7\Tools;C:\Windows\Microsoft.NET\Framework\v4.0.30319;C:\Program F
    18. iles (x86)\Microsoft Visual Studio 12.0\VC\VCPackages;C:\Program Files (x86)\HTM
    19. L Help Workshop;C:\Program Files (x86)\Microsoft Visual Studio 12.0\Team Tools\P
    20. erformance Tools;C:\Program Files (x86)\Windows Kits\8.1\bin\x86;C:\Program File
    21. s (x86)\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\;C:\Program Files (x8
    22. 6)\NVIDIA Corporation\PhysX\Common;C:\Program Files\NVIDIA GPU Computing Toolkit
    23. \CUDA\v7.0\bin;C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v7.0\libnvvp;C
    24. :\Ruby22\bin;C:\Perl64\site\bin;C:\Perl64\bin;C:\Python27\;C:\Python27\Scripts;C
    25. :\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Intel\iCLS Client\;C:\
    26. Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\Syste
    27. m32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Wind
    28. ows Live\Shared;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL
    29. ;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Fil
    30. es (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\
    31. Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\WiFi\bin\
    32. ;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Git\
    33. cmd;C:\Program Files (x86)\Git\bin;C:\Program Files (x86)\CMake\bin;C:\Program F
    34. iles (x86)\Skype\Phone\;C:\Program Files (x86)\nodejs\;C:\Program Files (x86)\PD
    35. Ftk\bin\;C:\Program Files\SlikSvn\bin;C:\Program Files\MATLAB\R2009b\runtime\win
    36. 64;C:\Program Files\MATLAB\R2009b\bin;C:\Program Files (x86)\Windows Kits\8.1\Wi
    37. ndows Performance Toolkit\;C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\
    38. ;C:\Program Files\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files\Microsof
    39. t SQL Server\110\Tools\Binn\;C:\Windows\system32\config\systemprofile\.dnx\bin;C
    40. :\Program Files\Microsoft DNX\Dnvm\;C:\Program Files (x86)\Microsoft Emulator Ma
    41. nager\1.0\;C:\Users\Pol\Desktop\flightPlanQt\lib\gdalwin32-1.4.1\bin;C:\texlive\
    42. 2014\bin\win32;C:\Users\Pol\AppData\Roaming\npm;C:\Program Files (x86)\Java\jre7
    43. \bin;C:\Program Files (x86)\MSBuild\12.0\Bin\;C:\Program Files (x86)\Microsoft V
    44. isual Studio 12.0\VC\bin\;C:\Qt\5.5\msvc2013_64\bin;C:\Qt\5.5\msvc2013_64\lib;C:
    45. \Python27;C:\Perl64\bin
    46.  
    47. C:\Qt\Static\src\qt-everywhere-opensource-src-5.5.0>REM Uncomment the below line
    48.  when using a git checkout of the source repository
    49.  
    50. C:\Qt\Static\src\qt-everywhere-opensource-src-5.5.0>REM SET PATH=C:\Qt\Static\sr
    51. c\qt-everywhere-opensource-src-5.5.0\qtrepotools\bin;C:\Qt\Static\src\qt-everywh
    52. ere-opensource-src-5.5.0\qtbase\bin;C:\Qt\Static\src\qt-everywhere-opensource-sr
    53. c-5.5.0\gnuwin32\bin;C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7
    54. \IDE\CommonExtensions\Microsoft\TestWindow;C:\Program Files (x86)\Microsoft SDKs
    55. \F#\3.1\Framework\v4.0\;C:\Program Files (x86)\MSBuild\12.0\bin;C:\Program Files
    56.  (x86)\Microsoft Visual Studio 12.0\Common7\IDE\;C:\Program Files (x86)\Microsof
    57. t Visual Studio 12.0\VC\BIN;C:\Program Files (x86)\Microsoft Visual Studio 12.0\
    58. Common7\Tools;C:\Windows\Microsoft.NET\Framework\v4.0.30319;C:\Program Files (x8
    59. 6)\Microsoft Visual Studio 12.0\VC\VCPackages;C:\Program Files (x86)\HTML Help W
    60. orkshop;C:\Program Files (x86)\Microsoft Visual Studio 12.0\Team Tools\Performan
    61. ce Tools;C:\Program Files (x86)\Windows Kits\8.1\bin\x86;C:\Program Files (x86)\
    62. Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\;C:\Program Files (x86)\NVIDI
    63. A Corporation\PhysX\Common;C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v7
    64. .0\bin;C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v7.0\libnvvp;C:\Ruby22
    65. \bin;C:\Perl64\site\bin;C:\Perl64\bin;C:\Python27\;C:\Python27\Scripts;C:\Progra
    66. mData\Oracle\Java\javapath;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program
    67. Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem
    68. ;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Windows Live
    69. \Shared;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Prog
    70. ram Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)
    71. \Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\In
    72. tel(R) Management Engine Components\IPT;C:\Program Files\Intel\WiFi\bin\;C:\Prog
    73. ram Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Git\cmd;C:\P
    74. rogram Files (x86)\Git\bin;C:\Program Files (x86)\CMake\bin;C:\Program Files (x8
    75. 6)\Skype\Phone\;C:\Program Files (x86)\nodejs\;C:\Program Files (x86)\PDFtk\bin\
    76. ;C:\Program Files\SlikSvn\bin;C:\Program Files\MATLAB\R2009b\runtime\win64;C:\Pr
    77. ogram Files\MATLAB\R2009b\bin;C:\Program Files (x86)\Windows Kits\8.1\Windows Pe
    78. rformance Toolkit\;C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\;C:\Prog
    79. ram Files\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files\Microsoft SQL Se
    80. rver\110\Tools\Binn\;C:\Windows\system32\config\systemprofile\.dnx\bin;C:\Progra
    81. m Files\Microsoft DNX\Dnvm\;C:\Program Files (x86)\Microsoft Emulator Manager\1.
    82. 0\;C:\Users\Pol\Desktop\flightPlanQt\lib\gdalwin32-1.4.1\bin;C:\texlive\2014\bin
    83. \win32;C:\Users\Pol\AppData\Roaming\npm;C:\Program Files (x86)\Java\jre7\bin;C:\
    84. Program Files (x86)\MSBuild\12.0\Bin\;C:\Program Files (x86)\Microsoft Visual St
    85. udio 12.0\VC\bin\;C:\Qt\5.5\msvc2013_64\bin;C:\Qt\5.5\msvc2013_64\lib;C:\Python2
    86. 7;C:\Perl64\bin
    87.  
    88. C:\Qt\Static\src\qt-everywhere-opensource-src-5.5.0>SET QMAKESPEC=win32-msvc2013
    89.  
    90.  
    91. C:\Qt\Static\src\qt-everywhere-opensource-src-5.5.0>SET _ROOT=
    92.  
    93. C:\Qt\Static\src\qt-everywhere-opensource-src-5.5.0>
    To copy to clipboard, switch view to plain text mode 


    Cheers
    Last edited by quimnuss; 14th September 2015 at 11:59.
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Similar Threads

  1. Inclusion compilation Model and separate compilation Model in Qt?
    By cwxfly in forum General Programming
    Replies: 3
    Last Post: 27th August 2015, 18:30
  2. How to Optimized Combined Graphical Operations?
    By sunny.cpp in forum Qt Programming
    Replies: 1
    Last Post: 28th April 2010, 12:06
  3. SDK vs. own compilation
    By codeman in forum Installation and Deployment
    Replies: 19
    Last Post: 20th October 2009, 10:50
  4. emit qt signal is very slow how it can be optimized?
    By sawerset in forum Qt Programming
    Replies: 8
    Last Post: 30th December 2008, 09:21
  5. Qt's optimized OpenGL context switching
    By sverhoff in forum Qt Programming
    Replies: 0
    Last Post: 28th March 2006, 16:40

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

Digia, Qt and their respective logos are trademarks of Digia Plc in Finland and/or other countries worldwide.