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

ID 767251
Date 7/13/2023
Public

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Document Table of Contents

par-affinity, Qpar-affinity

Specifies thread affinity. This feature is only available for ifort.

Syntax

Linux:

-par-affinity=[modifier,...]type[,permute][,offset]

macOS:

None

Windows:

/Qpar-affinity:[modifier,...]type[,permute][,offset]

Arguments

modifier

Is one of the following values: granularity={fine|thread|core|tile}, [no]respect, [no]verbose, [no]warnings, proclist=proc_list. The default is granularity=core, respect, and noverbose. For information on value proclist, see Thread Affinity Interface.

type

Indicates the thread affinity. This argument is required and must be one of the following values: compact, disabled, explicit, none, scatter, logical, physical. The default is none. Values logical and physical are deprecated. Use compact and scatter, respectively, with no permute value.

permute

Is a positive integer. You cannot use this argument with type setting explicit, none, or disabled. The default is 0.

offset

Is a positive integer. You cannot use this argument with type setting explicit, none, or disabled. The default is 0.

Default

OFF

The thread affinity is determined by the runtime environment.

Description

This option specifies thread affinity, which binds threads to physical processing units. It has the same effect as environment variable KMP_AFFINITY.

This option overrides the environment variable when both are specified.

This option only has an effect if the following is true:

  • You have specified option [Q]parallel or option [q or Q]openmp (or both).

  • You are compiling the main program.

NOTE:

This option may behave differently on Intel® microprocessors than on non-Intel microprocessors.

IDE Equivalent

None

Alternate Options

None

See Also