为什么装了Intel C++编译器以后，会把程序自动搞成多线程的

[jackfnx]

一个程序(基于OpenCV)，本来不是多线程的(运行时CPU占用率50%,debug可以看到单线程)
装了Intel编译器以后，同样一个exe，没有重新编译，就自动变成了多线程(运行时CPU占用率70%+，debug时可以看到3个线程)
为什么呢？明明没有重新编译啊

而且，如果卸载了Intel编译器，又会自动变回单线程。

为什么？是因为Intel编译器会自动替换某些系统库吗？

那么除了Intel编译器还有别人会干这种事吗？

[intel_www]

用denpendency walker看看安装和不安装时你的程序依赖的动态库有没有变化？

[intel_www]

用dependcy walker看一下安装和不安装intel编译器时你的程序所依赖的动态链接库有没有变化。

[ckc]

这个程序是你写的还是别人写的？

[jackfnx]

是自己写的
调用了OpenCV的库

[jackfnx]

以下是装了ICC和没装的Debug启动信息

可以看出，确实是有影响
那么问题是，有什么办法能够禁用这种多线程吗？
因为打算自己实现多线程，为了避免openmp对我的多线程造成干扰，想把他禁掉
能不能有什么方法能够保证，不管系统中是否存在ICC都能禁用多线程？
或者反过来也行，有什么方法能够保证不管系统是否存在ICC，都能启用多线程？


装了的
'FaceDetect.exe': Loaded 'D:\HoME\(Face)\FaceDetect_Rotated_lx\Release\FaceDetect.exe', Symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\ntdll.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\kernel32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\sysfer.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\HoME\(Face)\FaceDetect_Rotated_lx\Release\cv110.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'D:\HoME\(Face)\FaceDetect_Rotated_lx\Release\cxcore110.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\user32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\gdi32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\advapi32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\rpcrt4.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\WinSxS\x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.1433_x-ww_5cf844d2\msvcr80.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\msvcrt.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\WinSxS\x86_Microsoft.VC80.OpenMP_1fc8b3b9a1e18e3b_8.0.50727.762_x-ww_6c18549a\vcomp.dll', Symbols loaded (source information stripped).
'FaceDetect.exe': Loaded 'C:\WINDOWS\WinSxS\x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.1433_x-ww_5cf844d2\msvcp80.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'D:\HoME\(Face)\FaceDetect_Rotated_lx\Release\highgui110.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\comctl32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\avifil32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\winmm.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\ole32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\msacm32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\msvfw32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\shell32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\shlwapi.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\avicap32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\version.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\oleaut32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\imm32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\lpk.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\usp10.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ippcv-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ippcore-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\lib\ia32\libiomp5md.dll', Binary was not built with debug information.
First-chance exception at 0x7c812a5b in FaceDetect.exe: 0xA1A01DB1: 0xa1a01db1.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\mkl\ia32\bin\libimalloc.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ippcvv8-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ippi-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ippiv8-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ipps-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ippsv8-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ippvm-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ippvmv8-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ippcc-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\ipp\ia32\bin\ippccv8-6.0.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\Program Files\Intel\Compiler\11.0\074\cpp\mkl\ia32\bin\mkl_p4.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\MSVCR71.DLL', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.2982_x-ww_ac3f9c03\comctl32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\apphelp.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'D:\HoME\(Face)\FaceDetect_Rotated_lx\Release\ffopencv110.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\clbcatq.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\comres.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\netapi32.dll', No symbols loaded.
'FaceDetect.exe': Unloaded 'C:\WINDOWS\system32\netapi32.dll'
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\msyuv.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\msctf.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\MSCTFIME.IME', No symbols loaded.
The thread 'Win32 Thread' (0x1298) has exited with code 0 (0x0).

[jackfnx]

没装的
'FaceDetect.exe': Loaded 'D:\HoME\(Face)\FaceDetect_Rotated_lx\Release\FaceDetect.exe', Symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\ntdll.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\kernel32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\sysfer.dll', Binary was not built with debug information.
'FaceDetect.exe': Loaded 'D:\HoME\(Face)\FaceDetect_Rotated_lx\Release\cv110.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'D:\HoME\(Face)\FaceDetect_Rotated_lx\Release\cxcore110.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\user32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\gdi32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\advapi32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\rpcrt4.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\WinSxS\x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.1433_x-ww_5cf844d2\msvcr80.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\msvcrt.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\WinSxS\x86_Microsoft.VC80.OpenMP_1fc8b3b9a1e18e3b_8.0.50727.762_x-ww_6c18549a\vcomp.dll', Symbols loaded (source information stripped).
'FaceDetect.exe': Loaded 'C:\WINDOWS\WinSxS\x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.1433_x-ww_5cf844d2\msvcp80.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'D:\HoME\(Face)\FaceDetect_Rotated_lx\Release\highgui110.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\comctl32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\avifil32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\winmm.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\ole32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\msacm32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\msvfw32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\shell32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\shlwapi.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\avicap32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\version.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\oleaut32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\imm32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\lpk.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\usp10.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.2982_x-ww_ac3f9c03\comctl32.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'D:\HoME\(Face)\FaceDetect_Rotated_lx\Release\ffopencv110.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\clbcatq.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\comres.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\msyuv.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\msctf.dll', No symbols loaded.
'FaceDetect.exe': Loaded 'C:\WINDOWS\system32\MSCTFIME.IME', No symbols loaded.

[intel_www]

看来可能是你用的OpenCV的库自动引用了Intel IPP 和 MKL中的函数，因为缺省情况下Intel 编译器安装程序会安装这两个库。

如果你不想用它们，那么可以选择在安装的时候不安装这两个组件。如果你想在不安装编译器的系统上使用他们，那么你要把那些引用到的dll文件和你的程序一起发行，并保证正确的路径设置。

[hyhyj]

早期的openCV会自动检测IPP和调用ipp函数。许多ipp函数是多线程的。所以一装上，opencv就检测到了，还自动帮你多线程了。

请参见 OpenCV and IPP FAQ
http://software.intel.com/en-us/articles/intel-integrated-performance-primitives-intel-ipp-open-source-computer-vision-library-opencv-faq/