By default, the number of threads for Intel IPP threaded libraries equals the number of processors in the system. If the value of the OMP_NUM_THREADS environment variable is less than the number of processors in the system, then the number of threads for Intel IPP threaded libraries equals the value of the OMP_NUM_THREADS environment variable.
To configure the number of threads used by Intel IPP internally, call the function ippSetNumThreads(n) at the very beginning of an application. n is the desired number of threads (1, ...). To disable internal parallelization, call ippSetNumThreads(1).
To find the number of threads created by the Intel IPP, call function ippGetNumThreads.
Optimization Notice |
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The Intel® Integrated Performance Primitives (Intel® IPP) library contains functions that are more highly optimized for Intel microprocessors than for other microprocessors. While the functions in the Intel® IPP library offer optimizations for both Intel and Intel-compatible microprocessors, depending on your code and other factors, you will likely get extra performance on Intel microprocessors. While the paragraph above describes the basic optimization approach for the Intel® IPP library as a whole, the library may or may not be optimized to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include Intel® Streaming SIMD Extensions 2 (Intel® SSE2), Intel® Streaming SIMD Extensions 3 (Intel® SSE3), and Supplemental Streaming SIMD Extensions 3 (Intel® SSSE3) instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Intel recommends that you evaluate other library products to determine which best meets your requirements. |
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