Developer Guide and Reference

Contents

qopenmp, Qopenmp

Enables the parallelizer to generate multi-threaded code based on OpenMP* directives.

Syntax

Linux and macOS:
-qopenmp
-qno-openmp
Windows:
/Qopenmp
/Qopenmp-
Arguments
None
Default
-qno-openmp
or
/Qopenmp-
No OpenMP* multi-threaded code is generated by the compiler.
Description
This option enables the parallelizer to generate multi-threaded code based on OpenMP* directives. The code can be executed in parallel on both uniprocessor and multiprocessor systems.
This option works with any optimization level. Specifying no optimization (
-O0
on Linux* or
/Od
on Windows*) helps to debug OpenMP applications.
On
macOS*
systems, when you enable OpenMP* API, you must also set the DYLD_LIBRARY_PATH environment variable within Xcode* or an error will be displayed.
Options that use OpenMP* API are available for both Intel® microprocessors and non-Intel microprocessors, but these options may perform additional optimizations on Intel® microprocessors than they perform on non-Intel microprocessors. The list of major, user-visible OpenMP constructs and features that may perform differently on Intel® microprocessors versus non-Intel microprocessors include: locks (internal and user visible), the SINGLE construct, barriers (explicit and implicit), parallel loop scheduling, reductions, memory allocation, thread affinity, and binding.
Optimization Notice