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Intel® IPP - Threading / OpenMP* FAQ

This page contains common questions and answers on multi-threading in the Intel IPP.
Authored by Last updated on 10/10/2019 - 10:48
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OpenMP und inkrementelle Parallelisierung - (article in german)

In diesem Artikel wird der inkrementelle OpenMP Ansatz zur Parallelisierung von sequentiellen Programmen vorgestellt. Der Schwerpunkt liegt auf der praktischen Darstellung von einfachen Programmbeispielen und nicht auf der Vollständigkeit der Beschreibung
Authored by admin Last updated on 12/12/2018 - 18:00
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Building application with -openmp but no OpenMP pragmas causes segmentation fault

Compiling an application with the -openmp option that does not contain OpenMP pragmas causes a segmentation fault due to stack size overrun.
Authored by Elizabeth S (Intel) Last updated on 05/25/2018 - 15:30
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Intel® C++ Compiler - ANSI C/C++ and OpenMP* compliance

C Standard Conformance

Authored by Jennifer J. (Blackbelt) Last updated on 08/01/2019 - 19:50
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Don't Use the OpenMP* THREADPRIVATE 'Compatibility' Option when Everything is Compiled by Intel

The Intel C++ and Fortran compilers for Windows* and Linux* provide 'legacy' and 'compatibility' implementations of the OpenMP THREADPRIVATE directive. The 'compatibility' option should not be used when everything is compiled by Intel compilers.
Authored by Kenneth Craft (Intel) Last updated on 07/08/2019 - 15:12
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Diagnostic 1392: variable "entity" in firstprivate or lastprivate clause of an OpenMP pragma must be shared in the enclosing context

CauseOne case that the Intel C++ Compiler will emitting this diagnostic message is when using the "firstprivate" of OpenMP* with a wrong syntax.

Authored by admin Last updated on 05/25/2018 - 15:30
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Threading Fortran Applications for Parallel Performance on Multi-Core Systems

Advice and background information is given on typical issues that may arise when threading an application using the Intel Fortran Compiler and other software tools, whether using OpenMP, automatic parallelization or threaded libraries.
Authored by Martyn Corden (Intel) Last updated on 12/12/2018 - 18:00
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internal threshold was exceeded

In very large, complex functions, loops preceded by OpenMP directives may not be threaded. Compiler may emit the warning remark: "An internal threshold was exceeded: loops may not be vectorized or parallelized. Try to reduce routine size."
Authored by Martyn Corden (Intel) Last updated on 12/26/2018 - 13:11
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