# qopenmp, Qopenmp

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

## Syntax

Linux: | -qopenmp -qno-openmp

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.

### Note

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.

### Note

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.

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

Eclipse: Language > Process OpenMP Directives

Xcode: Language > Process OpenMP Directives

## Alternate Options

Linux and macOS: -fopenmp

Windows: /openmp

Parent topic: OpenMP* Options and Parallel Processing Options

## See Also

qopenmp-stubs, Qopenmp-stubs compiler option