Intel(R) - Computational and Systems Biology at MIT

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5 Intel® Math Kernel Library User’s GuideDynamic LinkingDuring dynamic linking, resolving of some undefined symbols is postponed until run time.Dynamically built executables still contain undefined symbols along with lists of librariesthat provide definitions of the symbols. When the executable is loaded, final linking is donebefore the application starts running. If several dynamically built executables use the samelibrary, the library loads to memory only once and the executables share it, thereby savingmemory. Dynamic linking ensures consistency in using and upgrading libraries, as all thedynamically built applications share the same library. This way of linking enables you toseparately update libraries and applications that use the libraries, which facilitates keepingapplications up-to-date. The advantages of dynamic linking are achieved at the cost ofrun-time performance losses, as a part of linking is done at run time and every unresolvedsymbol has to be looked up in a dedicated table and resolved. However, this is hardly anissue for Intel MKL.Making the ChoiceIt is up to you to select whether to link in Intel MKL libraries dynamically or statically whenbuilding your application.In most cases, users choose dynamic linking due to its strong advantages.However, if you are developing applications to be shipped to a third-party, to have nothingelse than your application shipped, you have to use static linking. To reduce the size ofexecutables shipped, you can also build custom dynamic libraries (see Building CustomShared Objects).Table 5-1 compares the linkage models.Table 5-1Quick comparison of Intel® MKL linkage modelsFeature Dynamic Linkage Static LinkageCustom DynamicLinkageProcessor Updates Automatic Automatic Recompile andredistributeOptimization All processors All processors All processorsBuild Link to dynamic libraries Link to static libraries Build separate dynamiclibraries and link tothem.Calling Regular names Regular names Modified namesTotal Binary Size Large Small SmallExecutable Size Smallest Small Smallest5-2
Linking Your Application with Intel® Math Kernel Library 5Table 5-1Quick comparison of Intel® MKL linkage models (continued)Feature Dynamic Linkage Static LinkageMulti-threaded /thread safeYes Yes YesCustom DynamicLinkageIntel MKL-specific Linking RecommendationsYou are strongly encouraged to dynamically link in Intel® Legacy OpenMP* run-timelibrary libguide and Intel® Compatibility OpenMP* run-time library libiomp. Linking tostatic OpenMP run-time library is not recommended, as it is very easy with layeredsoftware to link in more than one copy of the library. This causes performance problems(too many threads) and may cause correctness problems if more than one copy isinitialized.You are advised to link with libguide and libiomp dynamically even if other libraries arelinked statically.Link Command SyntaxTo link libraries having filenames libyyy.a or libyyy.so with your application, twooptions are available:• In the link line, list library filenames using relative or absolute paths, for example: myprog.o /opt/intel/mkl/10.0.xxx/lib/32/libmkl_solver.a/opt/intel/mkl/10.0.xxx/lib/32/libmkl_intel.a/opt/intel/mkl/10.0.xxx/lib/32/libmkl_intel_thread.a/opt/intel/mkl/10.0.xxx/lib/32/libmkl_core.a/opt/intel/mkl/10.0.xxx/lib/32/libguide.so -lpthreadwhere is a linker, myprog.o is the user's object file, and xxx is the Intel MKLpackage number, for example, "039".Appropriate Intel MKL libraries are listed first and followed by the system librarylibpthread.• In the link line, list library names (with absolute or relative paths, if needed) precededwith -L, which indicates where to search for binaries, and -I,which indicates where to search for header files. Discussion of linking with Intel MKLlibraries employs this option.To link with the Intel MKL libraries, specify paths and libraries in the link line as shownbelow.5-3
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Page 13 and 14: Getting Started 2This chapter helps
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LINPACK and MP LINPACKBenchmarks 10
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LINPACK and MP LINPACK Benchmarks 1
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A Intel® Math Kernel Library User
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IndexAAbsoft compiler, linking with
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Intel MKL choice, particular cases,
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Intel(R) - Computational and Systems Biology at MIT

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