Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 3/22/2024
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

fiopenmp, Qiopenmp

Enables recognition of OpenMP* features and tells the parallelizer to generate multi-threaded code based on OpenMP* directives. Provides the ability to offload to a GPU when -fopenmp-targets (or /Qopenmp-targets) is also specified. This feature is only available for ifx.

Syntax

Linux:

-fiopenmp

Windows:

/Qiopenmp

Arguments

None

Default

OFF

No OpenMP* multi-threaded code is generated by the compiler.

Description

This option enables recognition of OpenMP* features and tells 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 sets option auto.

This option works with any optimization level. Specifying no optimization (-O0 on Linux* or /Od on Windows*) helps to debug OpenMP applications.

To ensure that a threadsafe and/or reentrant runtime library is linked and correctly initialized, the same option should also be used for the link step and for the compilation of the main routine.

NOTE:

If you want to offload to a GPU target, you need to specify -fiopenmp (or /Qiopenmp) along with option -fopenmp-targets (or /Qopenmp-targets).

Product and Performance Information

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.

Notice revision #20201201

IDE Equivalent

Visual Studio: Language > OpenMP Support

Alternate Options

Linux: -qopenmp

Windows: /Qopenmp

See Also