Intel(R) - Computational and Systems Biology at MIT

5 Intel® Math Kernel Library User’s GuideThe second relevant component is the Compiler Support RTL Layer. Prior to Intel MKL 10.0,this layer only included the Intel® Legacy OpenMP* run-time compiler library libguide.Now you have a new choice to use the Intel® Compatibility OpenMP* run-time compilerlibrary libiomp. The Compatibility library provides support for one additional threadingcompiler on Linux (gnu). That is, a program threaded with a gnu compiler can safely belinked with Intel MKL and libiomp and execute efficiently and effectively.More about libiomp. libiomp is a new software. It has successfully been through a betatrial, it is robust and has shown few bugs even in the beta. In addition it offers excellentscaling with increasing numbers of cores in comparison to the Microsoft or gnu threadinglibraries. libiomp is essentially libguide with an interface layer to map the compilergenerated function calls to the libguide thread management software.Table 5-3 shows different scenarios, depending on the threading compiler used, and thepossibilities for each scenario to choose the Threading layer and RTL layer when using thecurrent version of Intel MKL (static cases only):Table 5-3Selecting the Threading LayerCompilerIntelApplicationThreaded?Does notmatterThreading Layermkl_intel_thread.RTL LayerRecommendedlibguide.so orlibiomp5.sognu Yes libmkl_gnu_thread.a libiomp5.so orGNU OpenMP layergnu Yes libmkl_sequential.a NoneCommentlibiomp5 offerssuperior scalingperformancegnu No libmkl_intel_thread.a libguide.so orlibiomp5.soother Yes libmkl_sequential.a Noneother No libmkl_intel_thread.a libguide.so orlibiomp5.soNOTE. If you compiled your application with libguide from Intel MKL9.x or earlier, then the you cannot use Intel MKL 10.0 with libiomp.5-10