Performance Matlab MEX在不更改代码的情况下减速

过去几周我一直在开发一些代码。代码封装在MATLAB中的MEX文件中。直到昨天，我通常的测试花了大约1秒。在重新编译代码而不做任何更改后，同一代码需要4秒钟以上的时间

唯一的变化发生在与我调用的函数完全无关的函数中。似乎所有的编译器优化都从一秒消失到另一秒

也许你们中有人在过去也经历过类似的事情，并且知道如何应对

谢谢你的建议

编辑1： 我假设它依赖于编译器，这里是编译命令的输出（使用verbose模式）

---

有时提问就是这样：你可以花几个小时寻找答案，但一旦你决定向某人寻求帮助，你就奇迹般地在脑海中找到了答案

清除MATLAB工作区解决了我所有的问题

不过，谢谢你的阅读；）

----------------------------------------------------------------
->    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++