Intel® C++ Compiler Classic Developer Guide and Reference

ID 767249
Date 3/31/2023
Public

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Document Table of Contents

parallel, Qparallel

Tells the auto-parallelizer to generate multithreaded code for loops that can be safely executed in parallel.

Syntax

Linux:

-parallel

macOS:

-parallel

Windows:

/Qparallel(or /Qpar)

Arguments

None

Default

OFF

Multithreaded code is not generated for loops that can be safely executed in parallel.

Description

This option tells the auto-parallelizer to generate multithreaded code for loops that can be safely executed in parallel.

To use this option, you must also specify option O2 or O3.

This option sets option [q or Q]opt-matmul if option O3 is also specified.

NOTE:

On macOS systems, when you enable automatic parallelization, you must also set the DYLD_LIBRARY_PATH environment variable within Xcode* or an error will be displayed.

NOTE:

Using this option enables parallelization for both Intel® microprocessors and non-Intel microprocessors. The resulting executable may get additional performance gain on Intel microprocessors than on non-Intel microprocessors. The parallelization can also be affected by certain options, such as /arch or /Qx (Windows*) or -m or -x (Linux* and macOS).

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: Optimization > Parallelization

Eclipse: Optimization > Parallelization

Xcode: Optimization > Parallelization

Alternate Options

None