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在过去的几周里,我一直在开发一些代码。代码包装在 MATLAB 中的 MEX 文件中。直到昨天,我通常的测试大约需要 1 秒钟。突然重新编译代码而不做任何更改后,相同的代码需要超过 4 秒。

唯一的变化发生在与我正在调用的函数完全无关的函数中。似乎所有编译器优化都从一秒钟消失到另一秒钟。

也许你们中的一个人过去经历过类似的事情并且知道如何处理?

谢谢你的建议。

编辑1:

因为我认为它依赖于编译器,这里是编译命令的输出(使用详细模式)

----------------------------------------------------------------
->    MATLAB                = /Applications/MATLAB_R2010b.app
->    CC                    = gcc-4.0
->    CC flags:
         CFLAGS             = -fno-common -no-cpp-precomp -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5  -fexceptions
         CDEBUGFLAGS        = -g
         COPTIMFLAGS        = -O2 -DNDEBUG
         CLIBS              = -L/Applications/MATLAB_R2010b.app/bin/maci64 -lmx -lmex -lmat -lstdc++
         arguments          =  -DMX_COMPAT_32
->    CXX                   = g++-4.0
->    CXX flags:
         CXXFLAGS           = -fno-common -no-cpp-precomp -fexceptions -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5
         CXXDEBUGFLAGS      = -g
         CXXOPTIMFLAGS      = -O2 -DNDEBUG
         CXXLIBS            = -L/Applications/MATLAB_R2010b.app/bin/maci64 -lmx -lmex -lmat -lstdc++
         arguments          =  -DMX_COMPAT_32
->    FC                    = gfortran
->    FC flags:
         FFLAGS             = -fexceptions -m64 -fbackslash
         FDEBUGFLAGS        = -g
         FOPTIMFLAGS        = -O
         FLIBS              = -L/Applications/MATLAB_R2010b.app/bin/maci64 -lmx -lmex -lmat -L -lgfortran -L -lgfortranbegin
         arguments          =  -DMX_COMPAT_32
->    LD                    = gcc-4.0
->    Link flags:
         LDFLAGS            = -Wl,-twolevel_namespace -undefined error -arch x86_64 -Wl,-syslibroot,/Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5 -bundle -Wl,-exported_symbols_list,/Applications/MATLAB_R2010b.app/extern/lib/maci64/mexFunction.map
         LDDEBUGFLAGS       = -g
         LDOPTIMFLAGS       = -O
         LDEXTENSION        = .mexmaci64
         arguments          =  /usr/lib/libarmadillo.dylib /usr/lib/liblapack.dylib /usr/lib/libblas.dylib
->    LDCXX                 = 
->    Link flags:
         LDCXXFLAGS         = 
         LDCXXDEBUGFLAGS    = 
         LDCXXOPTIMFLAGS    = 
         LDCXXEXTENSION     = 
         arguments          =  /usr/lib/libarmadillo.dylib /usr/lib/liblapack.dylib /usr/lib/libblas.dylib
----------------------------------------------------------------

-> g++-4.0 -c  -I/usr/include -I/Applications/MATLAB_R2010b.app/extern/include -I/Applications/MATLAB_R2010b.app/simulink/include -DMATLAB_MEX_FILE -fno-common -no-cpp-precomp -fexceptions -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5  -DMX_COMPAT_32 -O2 -DNDEBUG  "file1.cpp"

-> g++-4.0 -c  -I/usr/include -I/Applications/MATLAB_R2010b.app/extern/include -I/Applications/MATLAB_R2010b.app/simulink/include -DMATLAB_MEX_FILE -fno-common -no-cpp-precomp -fexceptions -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5  -DMX_COMPAT_32 -O2 -DNDEBUG  "file2.cpp"

-> g++-4.0 -c  -I/usr/include -I/Applications/MATLAB_R2010b.app/extern/include -I/Applications/MATLAB_R2010b.app/simulink/include -DMATLAB_MEX_FILE -fno-common -no-cpp-precomp -fexceptions -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5  -DMX_COMPAT_32 -O2 -DNDEBUG  "file3.cpp"

-> gcc-4.0 -O -Wl,-twolevel_namespace -undefined error -arch x86_64 -Wl,-syslibroot,/Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5 -bundle -Wl,-exported_symbols_list,/Applications/MATLAB_R2010b.app/extern/lib/maci64/mexFunction.map -o  "distanceSplinePoint.mexmaci64"  file1.o file2.o file3.o  /usr/lib/libarmadillo.dylib /usr/lib/liblapack.dylib /usr/lib/libblas.dylib -L/Applications/MATLAB_R2010b.app/bin/maci64 -lmx -lmex -lmat -lstdc++
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1 回答 1

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就像有时提出问题一样:您可以花费数小时寻找答案,但是一旦您决定向某人寻求帮助,您就会奇迹般地在脑海中得到答案。

清除 MATLAB-Workspace 解决了我所有的问题......

不过,感谢您的阅读;)

于 2011-05-06T14:06:16.810 回答