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++