Intel(R) Math Kernel Library for Linux* OS User's Guide

Intel® Math Kernel Library Structure 3Table 3-3Intel® MKL Layers (continued)LayerComputational LayerCompiler Support Run-timeLibraries (RTL)DescriptionHeart of Intel MKL. This layer has only one library for each combinationof architecture and supported OS. The Computational layeraccommodates multiple architectures through identification ofarchitecture features and chooses the appropriate binary code at runtime.Intel MKL provides compiler support RTLs only for Intel compilers:compatibility OpenMP* run-time library (libiomp) and legacyOpenMP* run-time library (libguide). To thread using third-partythreading compilers, use libraries in the Threading layer or anappropriate compatibility library (for more information, see Linking withThreading Libraries).Sequential Mode of the LibraryYou can use Intel MKL in a sequential (non-threaded) mode. In this mode, Intel MKL runsunthreaded code. However, it is thread-safe 1 , which means that you can use it in a parallelregion in your OpenMP* code. The sequential mode requires no compatibility OpenMP* orlegacy OpenMP* run-time library and does not respond to the environment variableOMP_NUM_THREADS or its Intel MKL equivalents.You should use the library in the sequential mode only if you have a particular reason notto use Intel MKL threading. The sequential mode may be helpful when using Intel MKL withprograms threaded with some non-Intel compilers or in other situations where you need anon-threaded version of the library (for instance, in some MPI cases). To set the sequentialmode, in the Threading layer, choose the *sequential.* library.Add the POSIX threads library (pthread) to your link line for the sequential mode becausethe *sequential.* library depends on pthread.See also:Directory Structure in DetailUsing the Intel® MKL ParallelismAvoiding Conflicts in the Execution EnvironmentLinking Examples.1. Except the LAPACK deprecated routine ?lacon.3-5