# qopt-block-factor, Qopt-block-factor

Lets you specify a loop blocking factor. This feature is only available for ifort.

## Syntax

Linux: | -qopt-block-factor=n

macOS: | -qopt-block-factor=n

Windows: | /Qopt-block-factor:n

## Arguments

n | Is the blocking factor. It must be an integer. The compiler may ignore the blocking factor if the value is 0 or 1.

## Default

OFF | The compiler uses default heuristics for loop blocking.

## Description

This option lets you specify a loop blocking factor.

## IDE Equivalent

None

## Alternate Options

None

Parent topic: Advanced Optimization Options