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

3 Intel® Math Kernel Library User’s Guide• The libmkl_intel_thread.a library in the Threading layer adapts Intel MKL to theOpenMP* implementation used by Intel compilers, and the libmkl_sequential.alibrary adapts Intel MKL to the non-threaded mode.The Computational layer is the bulk of Intel MKL. The library in this layer contains onlycode needed for pure computations, without adaptation to interfaces or OpenMP threading.Being organized this way, Intel MKL avoids duplication of the same code in differentlibraries and thus considerably saves space.You can combine Intel MKL independent libraries to meet your needs by linking with onelibrary in each part layer-by-layer. Once the interface library is selected, the threadinglibrary you select picks up the chosen interface, and the computational library usesinterfaces and OpenMP implementation (or non-threaded mode) chosen in the first twolayers. To learn which libraries to link with your application, see Chapter 5.Table 3-3 provides more details of each layer.Table 3-3LayerInterface LayerThreading LayerIntel® MKL LayersDescriptionMatches compiled code of your application with the threading and/orcomputational parts of the library. This layer provides:• LP64 and ILP64 interfaces(see Support for ILP64 Programming for details).• Compatibility with compilers that return function values differently.• A mapping between single-precision names and double-precisionnames for applications using Cray*-style naming (SP2DPinterface).SP2DP interface supports Cray-style naming in applicationstargeted for the Intel 64 or IA-64 architecture and using the ILP64interface. SP2DP interface provides a mapping betweensingle-precision names (for both real and complex types) in theapplication and double-precision names in Intel MKL BLAS andLAPACK. Function names are mapped as shown in the followingexample for BLAS functions *GEMM:SGEMM -> DGEMMDGEMM -> DGEMMCGEMM -> ZGEMMZGEMM -> ZGEMMMind that no changes are made to double-precision names.This layer:• Provides a way to link threaded Intel MKL with different threadingcompilers.• Enables you to link with a threaded or sequential mode of thelibrary.This layer is compiled for different environments (threaded orsequential) and compilers (from Intel, GNU*, and so on).3-4