Enables the parallelizer to generate multi-threaded code based on the OpenMP* directives.
IDE Equivalent
Windows: Language > OpenMP* Support
Linux: Language > Process OpenMP Directives
Mac OS X: Language > Process OpenMP Directives
Architectures
IA-32, Intel® 64 architectures
Syntax
Linux and Mac OS X: | -openmp |
Windows: | /Qopenmp |
Arguments
None
Default
OFF |
No OpenMP* multi-threaded code is generated by the compiler. |
Description
This option enables the parallelizer to generate multi-threaded code based on the 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.
Note
On Mac OS* X systems, when you enable OpenMP*, you must also set the DYLD_LIBRARY_PATH environment variable within Xcode or an error will be displayed.
Note
Options that use OpenMP* 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 |
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Intel’s compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and 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. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice. Notice revision #20110804 |
Alternate Options
Linux and Mac OS X: -fopenmp
Windows: /openmp